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  • 251.
    Scudino, S.
    et al.
    IFW Dresden, Inst Complex Mat, Solidificat Proc & Complex Struct, Helmholtzstr 20, D-01069 Dresden, Germany..
    Surreddi, Kumar Babu
    Högskolan Dalarna, Akademin Industri och samhälle, Materialteknik.
    Wang, G.
    Shanghai Univ, Lab Microstruct, Shanghai 200444, Peoples R China..
    Liu, G.
    Xi An Jiao Tong Univ, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China.;Xi An Jiao Tong Univ, Sch Mat Sci & Engn, Xian 710049, Peoples R China..
    Effect of stress concentration on plastic deformation of Zr41.2Ti13.8Cu12.5Ni10Be22.5 bulk metallic glass under compressive loading2016Ingår i: Materials letters (General ed.), ISSN 0167-577X, E-ISSN 1873-4979, Vol. 179, s. 202-205Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The influence of different sources of stress concentration on the plastic deformation of the Zr41.2Ti13.8Cu12.5Ni10Be22.5 metallic glass during room temperature compression tests is evaluated. Stress concentration introduced by sample geometry has a significant effect on the mechanical properties: in contrast to the specimen with square cross-section, which shows negligible plastic deformation, a substantial improvement in the plasticity can be achieved for the sample with round cross-section. Simulations of the stress distribution during the compression tests reveal that the stress concentration at the interface corners is responsible for the early fracture of the sample with square cross-section. Additionally, stress concentration during compression tests in the samples with square cross-section can be significantly reduced, and plastic deformation can be enhanced, by removing the interface corners as well as by reducing the friction arising between loading platens and specimen. 

  • 252.
    Scudino, Sergio
    et al.
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Ali, Fahad
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Surreddi, Kumar Babu
    IFW Dresden, Institut für Komplexe Materialien.
    Prashanth, Konda Gokuldoss
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Sakaliyska, Miroslava
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Eckert, Jürgen
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Al-based metal matrix composites reinforced with nanocrystalline Al-Ti-Ni particles2010Ingår i: Journal of Physics: Conference Series, ISSN 1742-6588, nr 1Artikel i tidskrift (Refereegranskat)
  • 253.
    Scudino, Sergio
    et al.
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Donnadieu, Patricia
    Laboratoire SIMaP, CNRS—Université de Grenoble, F-38402 Saint Martin d’Hères, France.
    Surreddi, Kumar Babu
    IFW Dresden, Institut für Komplexe Materialien.
    Nikolowski, K
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Stoica, Mihai
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Eckert, Jürgen
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Microstructure and mechanical properties of Laves phase-reinforced Fe–Zr–Cr alloys2009Ingår i: Intermetallics, ISSN 0966-9795, Vol. 17, nr 7, s. 532-539Artikel i tidskrift (Refereegranskat)
  • 254.
    Scudino, Sergio
    et al.
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Jerliu, Bujar
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Pauly, Simon
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Surreddi, Kumar Babu
    IFW Dresden, Institut für Komplexe Materialien.
    Kühn, Uta
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Eckert, Jürgen
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Ductile bulk metallic glasses produced through designed heterogeneities2011Ingår i: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 65, nr 9, s. 815-818Artikel i tidskrift (Refereegranskat)
  • 255.
    Scudino, Sergio
    et al.
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Jerliu, Bujar
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Surreddi, Kumar Babu
    IFW Dresden, Institut für Komplexe Materialien.
    Kühn, Uta
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Eckert, Jürgen
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Effect of cold rolling on compressive and tensile mechanical properties of Zr52. 5Ti5Cu18Ni14.5Al10 bulk metallic glass2011Ingår i: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 509Artikel i tidskrift (Refereegranskat)
  • 256.
    Scudino, Sergio
    et al.
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Liu, Gang
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Prashanth, Konda Gokuldoss
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Bartusch, B
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Surreddi, Kumar Babu
    IFW Dresden, Institut für Komplexe Materialien.
    Murty, Budaraju Srinivasa
    Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai – 600036, India.
    Eckert, Jürgen
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Mechanical properties of Al-based metal matrix composites reinforced with Zr-based glassy particles produced by powder metallurgy2009Ingår i: Acta Materialia, ISSN 1359-6454, E-ISSN 1873-2453, Vol. 57, nr 6, s. 2029-2039Artikel i tidskrift (Refereegranskat)
  • 257.
    Scudino, Sergio
    et al.
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Liu, Gang
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Sakaliyska, Mira
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Surreddi, Kumar Babu
    IFW Dresden, Institut für Komplexe Materialien.
    Eckert, Jürgen
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Powder metallurgy of Al-based metal matrix composites reinforced with β-Al3Mg2 intermetallic particles: Analysis and modeling of mechanical properties2009Ingår i: Acta Materialia, ISSN 1359-6454, E-ISSN 1873-2453, Vol. 57, nr 15, s. 4529-4538Artikel i tidskrift (Refereegranskat)
  • 258.
    Scudino, Sergio
    et al.
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Sakaliyska, Mira
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Surreddi, Kumar Babu
    IFW Dresden, Institut für Komplexe Materialien.
    Eckert, Jürgen
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Mechanical alloying and milling of Al–Mg alloys2009Ingår i: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 483, nr 1-2, s. 2-7Artikel i tidskrift (Refereegranskat)
  • 259.
    Scudino, Sergio
    et al.
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Sakaliyska, Mira
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Surreddi, Kumar Babu
    IFW Dresden, Institut für Komplexe Materialien.
    Eckert, Jürgen
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Solid-state processing of Al-Mg alloys2009Ingår i: Journal of Physics: Conference Series, ISSN 1742-6588, Vol. 144, nr 1Artikel i tidskrift (Refereegranskat)
  • 260.
    Scudino, Sergio
    et al.
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Sakaliyska, Miroslava
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Stoica, Mihai
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Surreddi, Kumar Babu
    IFW Dresden, Institut für Komplexe Materialien.
    Ali, Fahad
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Vaughan, Gavin
    European Synchrotron Radiation Facilities (ESRF), BP 220, Grenoble 38043, France.
    Yavari, A R
    LTCPM (CNRS umr 5614), Institut National Polytechnique de Grenoble, BP 75, 38402 St‐Martin‐d'Hères Campus, France.
    Eckert, Jürgen
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    In‐situ X‐ray diffraction of mechanically milled β‐Al3Mg2 powders2008Ingår i: Physica Status Solidi. Rapid Research Letters, ISSN 1862-6254, E-ISSN 1862-6270, Vol. 2, nr 6, s. 272-274Artikel i tidskrift (Refereegranskat)
  • 261.
    Scudino, Sergio
    et al.
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Sakaliyska, Miroslava
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Surreddi, Kumar Babu
    IFW Dresden, Institut für Komplexe Materialien.
    Ali, Fahad
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Eckert, Jürgen
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Structure and mechanical properties of Al–Mg alloys produced by copper mold casting2010Ingår i: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 504, s. S483-S486Artikel i tidskrift (Refereegranskat)
  • 262.
    Scudino, Sergio
    et al.
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Surreddi, Kumar Babu
    IFW Dresden, Institut für Komplexe Materialien.
    Eckert, Jürgen
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Mechanical properties of cold‐rolled Zr60Ti5Ag5Cu12.5Ni10Al7.5 metallic glass2010Ingår i: Physica Status Solidi (a) applications and materials science, ISSN 1862-6300, E-ISSN 1862-6319, Vol. 207, nr 5, s. 1118-1121Artikel i tidskrift (Refereegranskat)
  • 263.
    Scudino, Sergio
    et al.
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Surreddi, Kumar Babu
    IFW Dresden, Institut für Komplexe Materialien.
    Khoshkhoo, Mohsen Samadi
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Sakaliyska, Miroslava
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Wang, Gang
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Eckert, Jürgen
    Improved Room Temperature Plasticity of Zr41.2Ti13.8Cu12.5Ni10Be22.5 Bulk Metallic Glass by Channel‐Die Compression2010Ingår i: Advanced Engineering Materials, ISSN 1438-1656, E-ISSN 1527-2648, Vol. 12, nr 11, s. 1123-1126Artikel i tidskrift (Refereegranskat)
  • 264.
    Scudino, Sergio
    et al.
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Surreddi, Kumar Babu
    IFW Dresden, Institut für Komplexe Materialien.
    Nguyen, H V
    Research Center for Machine Parts and Materials Processing, University of Ulsan, San 29, 680749 Ulsan Korea.
    Liu, Gang
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Gemming, Thomas
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Sakaliyska, Mira
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Kim, Ji Soon
    Research Center for Machine Parts and Materials Processing, University of Ulsan, San 29, 680749 Ulsan Korea.
    Vierke, Jens
    Hahn-Meitner-Institut Berlin, Glienicker Strasse 100, 14109 Berlin Germany.
    Wollgarten, Markus
    Hahn-Meitner-Institut Berlin, Glienicker Strasse 100, 14109 Berlin Germany.
    Eckert, Jürgen
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    High-strength Al87Ni8La5 bulk alloy produced by spark plasma sintering of gas atomized powders2009Ingår i: Journal of Materials Research, ISSN 0884-2914, E-ISSN 2044-5326, Vol. 24, nr 9, s. 2909-2916Artikel i tidskrift (Refereegranskat)
  • 265.
    Scudino, Sergio
    et al.
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Surreddi, Kumar Babu
    IFW Dresden, Institut für Komplexe Materialien.
    Sager, S
    FG Physikalische Metallkunde, FB 11 Material- und Geowissenschaften, Technische Universität Darmstadt, Petersenstraße 23, D-64287, Darmstadt, Germany.
    Sakaliyska, Miroslava
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Kim, Ji Soon
    Research Center for Machine Parts and Materials Processing, University of Ulsan, San 29, 680749 Ulsan Korea.
    Löser, W
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Eckert, Jürgen
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Production and mechanical properties of metallic glass-reinforced Al-based metal matrix composites2008Ingår i: Journal of Materials Science, ISSN 0022-2461, E-ISSN 1573-4803, Vol. 43, nr 13, s. 4518-4526Artikel i tidskrift (Refereegranskat)
  • 266.
    Scudino, Sergio
    et al.
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Surreddi, Kumar Babu
    IFW Dresden, Institut für Komplexe Materialien.
    Wang, Gang
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Eckert, Jürgen
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Enhanced plastic deformation of Zr41.2Ti13.8Cu12.5Ni10Be22.5 bulk metallic glass by the optimization of frictional boundary restraints2010Ingår i: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 62, nr 10, s. 750-753Artikel i tidskrift (Refereegranskat)
  • 267.
    Scudino, Sergio
    et al.
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Venkataraman, Shankar
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Stoica, Mihai
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Surreddi, Kumar Babu
    IFW Dresden, Institut für Komplexe Materialien.
    Pauly, Simon
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany; .
    Das, Jayanta
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Eckert, Jürgen
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Consolidation and mechanical properties of ball milled Zr50Cu50 glassy ribbons2009Ingår i: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 483, nr 1-2, s. 227-230Artikel i tidskrift (Refereegranskat)
  • 268.
    Selo Mustafa, Muhammed
    et al.
    Högskolan Dalarna, Akademin Industri och samhälle, Materialvetenskap.
    Osterman, Jesper
    Högskolan Dalarna, Akademin Industri och samhälle, Materialvetenskap.
    Tunell, Helena
    Högskolan Dalarna, Akademin Industri och samhälle, Materialvetenskap.
    Skarp, Kent
    Högskolan Dalarna, Akademin Industri och samhälle, Materialvetenskap.
    Kozlovsky, M.
    Synthesis, spectroscopic characterisation and alignment of novel azobenzene containing monomers2005Ingår i: Liquid crystals (Print), ISSN 0267-8292, E-ISSN 1366-5855, Vol. 32, nr 7, s. 901-908Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A series of novel bifunctionalized photochromic monomers were synthesized, focusing on those with polymerizable acrylic/methacrylic groups attached to both ends of an azobenzene core via flexible spacers. The phase behaviour of the monomers was investigated using DSC, polarizing optical microscopy and X‐ray diffraction. The change in UV‐vis absorbance of the monomers under illumination with non‐polarized/polarized UV light was studied for both solutions and thin films; also studied was its relaxation in the dark. On illumination with LPUV light, in‐plane reorientation of the molecules normal to the polarization of the exciting UV light, and aggregation of the molecules in the films, were found.

  • 269.
    Sepehr, Omid
    Högskolan Dalarna, Akademin Industri och samhälle, Materialteknik.
    Optimering av härdrecept – En förstudie2015Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    SKF har installerat en relativt ny härdlinje för stora dimensioner i Göteborg. Härdlinjen är en kvalitets- och kapacitetshöjande investering som främst skall tillgodose den europeiska marknaden. Idag används tre härdrecept som tillgodoser sortimentet för stora dimensioner med rätt kvalitet enligt SKFs interna standard. Nu vill SKF förbättra härdrecepten ytterligare genom att undersöka möjligheten att skapa mer specifika härdrecept utifrån sammansättningen. För att lyckas med detta behövs kunskaper om hur sammansättningen påverkar härdningen. Ett av kvalitetskraven är att hela godset har en undre bainitisk struktur. Den materialegenskap som är ytterst viktig att känna till är härdbarheten. Härdbarheten är ett mått på hur tjocka gods som kan genomhärdas, vilket påverkas av både sammansättningen och austenitiseringen.

    I detta examensarbete har bland annat sammansättningens bidrag till härdbarheten och legeringsvariationens påverkan på härdbarheten undersökts. Stålleverantörens sammansättningsvariation för respektive materialstandard är väl kontrollerad och påverkar inte härdbarheten för de rekommenderade godsdimensionerna. Stålleverantören kan därför garantera genomhärdning av en viss tjocklek. Undersökningen som har gjorts i detta arbete visar att denna rekommenderade godstjocklek överskrids och detta måste på något vis kompenseras. En för låg härdbarhet kan effektivast kompenseras genom en temperaturökning, denna begränsas dock av hållfasthetskraven. Huruvida rätt härdparametrar har valts för kompensationen måste dock undersökas, vilket har föreslagits i detta arbete.

  • 270.
    Sina, Hossein
    et al.
    Materials Engineering, Lund University, P.O. Box 118, 22100, Lund, Sweden.
    Surreddi, Kumar Babu
    Materials Engineering, Lund University.
    Iyengar, Srinivasan
    Materials Engineering, Lund University, P.O. Box 118, 22100, Lund, Sweden.
    Phase evolution during the reactive sintering of ternary Al–Ni–Ti powder compacts2016Ingår i: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 661, s. 294-305Artikel i tidskrift (Refereegranskat)
  • 271.
    Skalare, Henrik
    Högskolan Dalarna, Akademin Industri och samhälle, Materialteknik.
    Optimering av patenteringsprocess: En undersökning om blypatentering2014Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Vid värmebehandling av fjäder – och pianotråd används blypatenteringsprocessen för framställning av klena tråddimensioner. Under processen vill man få den grova lamellstrukturen av perlit att bli finlamellär. Tråden värms upp i austenitområdet vid en temperatur av ca 900 °C för att sedan kylas ner till en temperatur av ca 530 °C i ett bad med flytande bly. Denna värmebehandling ger väldigt tunna lameller med ferrit och cementit, finlamellär perlit. Arbetet kommer ta upp de mikrostrukturer som har bildats vid behandlingen. Olika testmetoder har använts för att understryka att mikrostrukturerna är de rätta för denna typ av värmebehandling och stålsort. Studien kommer undersöka patenteringsprocessen hos Springwire AB i Lesjöfors. Om upptäckter sker att processen har ett felaktigt tillvägagångssätt eller att fel mikrostrukturer erhålls kommer dessa att rättas till under arbetets tid. Mikrostrukturen har efter analyser konstaterats att det är den önskade finlamellära perliten som växt fram med små karbider av cementit i grundmassan. Efter överläggande med berörda parter kunde slutsatsen dras att patenteringsprocessen har något förhöjda hastigheter jämfört med de teoretiska hastigheterna. Efter att resultaten presenterades har olika förslag framtagits för att förbättra processen.

  • 272.
    Song, KaiKai
    et al.
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Pauly, Simon
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany; .
    Wang, Zhi
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Scudino, Sergio
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Gargarella, Peter
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Surreddi, Kumar Babu
    IFW Dresden, Institut für Komplexe Materialien.
    Kühn, Uta
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Eckert, Jürgen
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Significant tensile ductility induced by cold rolling in Cu47.5Zr47.5Al5 bulk metallic glass2011Ingår i: Intermetallics, ISSN 0966-9795, Vol. 19, nr 10, s. 1394-1398Artikel i tidskrift (Refereegranskat)
  • 273.
    Srivastava, Vikas C
    et al.
    Metal Extraction & Forming Division, National Metallurgical Laboratory, Jamshedpur 831 007, India.
    Surreddi, Kumar Babu
    IFW Dresden, Institut für Komplexe Materialien.
    Scudino, Sergio
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Schowalter, Marco
    Institut für Festkörperphysik, Universität Bremen, Otto-Hahn-Allee 1, D-28359 Bremen, Germany.
    Uhlenwinkel, Volker
    Institut für Werkstofftechnik, Universität Bremen, Badgasteiner Str. 3, D-28359 Bremen, Germany.
    Schulz, Alwin
    Institut für Werkstofftechnik, Universität Bremen, Badgasteiner Str. 3, D-28359 Bremen, Germany.
    Eckert, Jürgen
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Rosenauer, Andreas
    Institut für Festkörperphysik, Universität Bremen, Otto-Hahn-Allee 1, D-28359 Bremen, Germany.
    Zoch, Hans Werner
    Institut für Werkstofftechnik, Universität Bremen, Badgasteiner Str. 3, D-28359 Bremen, Germany.
    Microstructural characteristics of spray formed and heat treated Al–(Y, La)–Ni–Co system2013Ingår i: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 578, s. 471-480Artikel i tidskrift (Refereegranskat)
  • 274.
    Srivastava, Vikas C
    et al.
    National Metallurgical Laboratory, Jamshedpur-831 007, India.
    Surreddi, Kumar Babu
    IFW Dresden, Institut für Komplexe Materialien.
    Scudino, Sergio
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Schowalter, Marco
    Institut für Festkörperphysik, Universität Bremen, Otto-Hahn-Allee 1, D-28359 Bremen, Germany.
    Uhlenwinkel, Volker
    Institut für Werkstofftechnik, Universität Bremen, Badgasteiner Str. 3, D-28359 Bremen, Germany.
    Schulz, Alwin
    Institut für Werkstofftechnik, Universität Bremen, Badgasteiner Str. 3, D-28359 Bremen, Germany.
    Eckert, Jürgen
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Rosenauer, Andreas
    Institut für Festkörperphysik, Universität Bremen, Otto-Hahn-Allee 1, D-28359 Bremen, Germany.
    Zoch, H-W
    Institut für Werkstofftechnik, Universität Bremen, Badgasteiner Str. 3, D-28359 Bremen, Germany.
    Microstructure and mechanical properties of partially amorphous Al85Y8Ni5Co2 plate produced by spray forming2010Ingår i: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 527, nr 10-11, s. 2747-2758Artikel i tidskrift (Refereegranskat)
  • 275.
    Srivastava, Vikas C
    et al.
    National Metallurgical Laboratory, Jamshedpur-831 007, India.
    Surreddi, Kumar Babu
    IFW Dresden, Institut für Komplexe Materialien.
    Scudino, Sergio
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Schowalter, Marco
    Institut für Festkörperphysik, Universität Bremen, Otto-Hahn-Allee 1, D-28359 Bremen, Germany.
    Uhlenwinkel, Volker
    Institut für Werkstofftechnik, Universität Bremen, Badgasteiner Str. 3, D-28359 Bremen, Germany.
    Schulz, Alwin
    Institut für Werkstofftechnik, Universität Bremen, Badgasteiner Str. 3, D-28359 Bremen, Germany.
    Rosenauer, Andreas
    Institut für Festkörperphysik, Universität Bremen, Otto-Hahn-Allee 1, D-28359 Bremen, Germany.
    Zoch, H-W
    Institut für Werkstofftechnik, Universität Bremen, Badgasteiner Str. 3, D-28359 Bremen, Germany.
    Novel microstructural characteristics and properties of spray formed Al-RE-TM based alloys2009Ingår i: International conference on Spray forming 2009, 2009Konferensbidrag (Refereegranskat)
  • 276.
    Srivastava, Vikas C
    et al.
    National Metallurgical Laboratory, Jamshedpur-831 007, India.
    Surreddi, Kumar Babu
    IFW Dresden, Institut für Komplexe Materialien.
    Scudino, Sergio
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Schowalter, Marco
    Institut für Festkörperphysik, Universität Bremen, Otto-Hahn-Allee 1, D-28359 Bremen, Germany.
    Uhlenwinkel, Volker
    Institut für Werkstofftechnik, Universität Bremen, Badgasteiner Str. 3, D-28359 Bremen, Germany.
    Schulz, Alwin
    Institut für Werkstofftechnik, Universität Bremen, Badgasteiner Str. 3, D-28359 Bremen, Germany.
    Rosenauer, Andreas
    Institut für Festkörperphysik, Universität Bremen, Otto-Hahn-Allee 1, D-28359 Bremen, Germany.
    Zoch, H-W
    Institut für Werkstofftechnik, Universität Bremen, Badgasteiner Str. 3, D-28359 Bremen, Germany.
    Eckert, Jürgen
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Spray forming of bulk Al85Y8Ni5Co2 with co-existing amorphous, nano-and micro-crystalline structures2009Ingår i: Transactions of the Indian Institute of Metals, ISSN 0972-2815, E-ISSN 0975-1645, Vol. 62, nr 4-5, s. 331-335Artikel i tidskrift (Refereegranskat)
  • 277.
    Srivastava, Vikas C
    et al.
    National Metallurgical Laboratory, Jamshedpur-831 007, India.
    Surreddi, Kumar Babu
    IFW Dresden, Institut für Komplexe Materialien.
    Uhlenwinkel, Volker
    Institut für Werkstofftechnik, Universität Bremen, Badgasteiner Str. 3, D-28359 Bremen, Germany.
    Schulz, Alwin
    Institut für Werkstofftechnik, Universität Bremen, Badgasteiner Str. 3, D-28359 Bremen, Germany.
    Eckert, Jürgen
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Zoch, H-W
    Institut für Werkstofftechnik, Universität Bremen, Badgasteiner Str. 3, D-28359 Bremen, Germany.
    Formation of nanocrystalline matrix composite during spray forming of Al83La5Y5Ni5Co22009Ingår i: Metallurgical and Materials Transactions. A, ISSN 1073-5623, E-ISSN 1543-1940, Vol. 40, nr 2, s. 450-461Artikel i tidskrift (Refereegranskat)
  • 278.
    Ssemakula, Hamzah
    Högskolan Dalarna, Akademin Industri och samhälle, Materialteknik.
    Minimization of stock weight during close-die forging of a spindle2013Ingår i: Materials Sciences and Applications, ISSN 2153-117X, E-ISSN 2153-1188, Vol. 4, s. 217-224Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In this paper, Finite Element method and full-scale experiments have been used to study a hot forging method for fabri-cation of a spindle using reduced initial stock size. The forging sequence is carried out in two stages. In the first stage, the hot rolled cylindrical billet is pre-formed and pierced in a closed die using a spherical nosed punch to within 20 mm of its base. This process of piercing or impact extrusion leads to high strains within the work piece but requires high press loads. In the second stage, the resulting cylinder is placed in a die with a flange chamber and upset forged to form a flange. The stock mass is optimized for complete die filling. Process parameters such as effective strain distribution, material flow and forging load in different stages of the process are analyzed. It is concluded from the simulations that minor modifications of piercing punch geometry to reduce contact between the punch and emerging vertical walls of the cylinder appreciably reduces the piercing load. In the flange chamber, a die surfaces angle of 52° instead of 45° is pro-posed to ensure effective material flow and exert sufficient tool pressure to achieve complete cavity filling. In order to achieve better compression, it is also proposed to shorten both the length of the inserted punch and the die “tongues” by a few mm.

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  • 279. Stanciu, V.
    et al.
    Wilhelmsson, O.
    Bexell, Ulf
    Högskolan Dalarna, Akademin Industri och samhälle, Materialvetenskap.
    Adell, M.
    Sadowski, J.
    Kanski, J.
    Warnicke, P.
    Svedlindh, P.
    Influence of annealing parameters on the ferromagnetic properties of optimally passivated (Ga,Mn)As epilayers2005Ingår i: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 72, nr 12, artikel-id 125324Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The influence of annealing parameters—temperature (Ta) and time (ta)—on the magnetic properties of As-capped (Ga,Mn)As epitaxial thin films has been investigated. The dependence of the transition temperature (TC) on ta marks out two regions. The TC peak behavior, characteristic of the first region, is more pronounced for thick samples, while for the second ("saturated") region the effect of ta is more pronounced for thin samples. A right choice of the passivation medium, growth conditions along with optimal annealing parameters routinely yield TC-values of ~150 K and above, regardless of the thickness of the epilayers

  • 280.
    Stenström, Mikael
    Högskolan Dalarna, Akademin Industri och samhälle, Materialvetenskap.
    Deposited copper as lubrication when drawing of titanium wire; a study of method.2016Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [en]

    This work performed at Sandvik Materials Technology has studied the possibility of using copper as lubrication during Ti-wire drawing. A PVD-method was used to deposit Cu on Ti-wires. The PVD coated copper samples were compared to a reference material of solid Cu which first had to be recrystallized. Different reduction combinations were investigated in the wire drawing and the Cu-coated wires were drawn both without and with MoS2 lubrication. Values, including drawing forces, HV and tensile testing, from already drawn Ti-wires without Cu were included in the matrix and the drawing forces were then compared. Significant contributions of friction were present in the first draw of all unlubricated Cu-coated Ti-wires. The forces decreased considerably after the first draw. After four drawings, done on one of these wires, the forces then were in the same region as the lubricated wires at the same reductions. No clear tendencies of uneven hardening were observed regardless of friction or used reduction. Tensile testing after wire drawing could not be performed as the wires broke at the wrong places. Measurements of residual stress on worked and unworked Cu-layers showed no residual stress, surprisingly. This study shows that Cu can be used as lubrication if the process is optimized with respect to Cu layer thickness, drawing tool-angles and reduced tungsten carbide grain size in drawing tools. A smoothening draw is needed before reduction of the Ti-wire to help lower the friction.

  • 281.
    Stjärne, Linice
    Högskolan Dalarna, Akademin Industri och samhälle, Materialteknik.
    Materialanalys och jämförelse av badrumsskåp från tre olika tillverkare2015Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Denna rapport bygger på ett examensarbete som utförts i samarbete med CSI Nordic AB. Arbetet är till för att hjälpa en kund att få mer kunskap och information om en av dess egna produkter, som är ett badrumsskåp, och även två konkurrenters badrumsskåp.

    Rapporten innehåller en materialanalys av de tre badrumsskåpen, som på grund av anonymitetsbegäran benämns A, B och C.

    Prover som har utförts är livslängdsprovning genom fuktexponering, dragprovning, hårdhetsmätning och repprovning. Det har även genomförts strukturanalyser av stålen och kemiska analyser av material och ytbeläggningar.

    Resultatet av proverna visar badrumsskåpen är tillverkade i likvärdiga stål, dvs. stålen har mycket små skillnader i kemisk sammansättning och mekaniska egenskaper. Skåp A uppvisar tydliga skillnader i struktur och hårdhet mellan prover uttagna längs eller tvärs valsriktningen.

    Repprovningen visar att skåp B och skåp C har mycket sämre repmotstånd än skåp A, vilket beror på färgskiktets sammansättning, egenskaper och vidhäftning. Den kemiska analysen av beläggningarna visar att skåp A och B har en zinkbeläggning, medan skåp C har en zinkfosfatbeläggning. Skåp C var även det enda skåp som uppvisade lokal korrosion vid avslutad fuktexponering

  • 282.
    Storck, Joakim
    Högskolan Dalarna, Akademin Industri och samhälle, Materialvetenskap.
    Exploring improvement trajectories with dynamic process cost modelling: a case from the steel industry2010Ingår i: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 48, nr 12, s. 3493-3511Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Improvement trajectories are sequential managed chains of improvement initiatives required to handle changes in competition and market. This paper presents a five-step framework, based on dynamic process cost modelling, which was developed during a four-year research project at a major stainless steel producer, to support the selection of an improvement trajectory based on strategic requirements to combine high product diversity with cost reduction. The framework aims to develop insight into what manufacturing capabilities are required to reach the strategic goals by combining system dynamics simulation with process cost modelling and visual exploratory data analysis in an iterative modelling procedure. The applicability of the five-step framework is demonstrated through a case study from the steel industry, in which a goal driven analysis is used to assess process requirements based on performance and market considerations.

  • 283.
    Storck, Joakim
    Högskolan Dalarna, Akademin Industri och samhälle, Materialvetenskap.
    Product variety and upstream versus downstream flexibility2009Ingår i: Proceedings of the International 3'rd Swedish Production Symposium / [ed] Rosén, B.G., Göteborg, 2009, s. 304-309Konferensbidrag (Refereegranskat)
    Abstract [en]

    Niche market steel producers tend to manufacture a wide range of products that are sold in low quantities. Current steelmaking—continuous casting (SCC) technology forces producers to operate according to combined make–to–stock/make–to–order order policies and keep in–process inventory. This leads to intermediate cooling of workpieces, high energy consumption, and high inventory and reheating costs. This paper evaluates links between product range and process flexibility upstream and downstream form the customer order decoupling point. The operational capabilities that result from improved process flexibility make diversified low cost steel production possible. At the same time the environmental sustainability of production can be improved. The strategic importance of process flexibility improvements are discussed with reference to the concept of competitive frontiers.

  • 284.
    Storck, Joakim
    Högskolan Dalarna, Akademin Industri och samhälle, Materialvetenskap.
    Product variety, flexibility and energy use in hot rolling mills2012Ingår i: Enabling Manufacturing Competitiveness and Economic Sustainability: Proceedings of the 4th International Conference on Changeable,Agile, Reconfigurable and Virtual production (CARV2011),Montreal, Canada, 2-5 October 2011 / [ed] ElMaraghy, Hoda, Montreal: Springer, 2012, Vol. 2, s. 80-85Konferensbidrag (Refereegranskat)
    Abstract [en]

    Hot rolling consumes one third of the energy in a steel plant. Increasing product variety slows down production flow, causing heat losses and increased reheating energy consumption. A system dynamics model was developed to evaluate how flexibility influences energy use. Results indicate that world best practice requires high flexibility and low to intermediate product variety. Up to 28% less reheating was needed for low product variety, but no improvement was obtained for high product variety; a flexible steelmaking process for efficient production of small batches of steel would be required. The strategic nature of process flexibility investments is discussed.

  • 285.
    Storck, Joakim
    Högskolan Dalarna, Akademin Industri och samhälle, Materialvetenskap. Högskolan Dalarna, Akademin Industri och samhälle, Materialteknik. Kungliga tekniska högskolan.
    Strategic and operational capabilities in steel production: Product variety and performance2009Doktorsavhandling, monografi (Övrigt vetenskapligt)
    Abstract [en]

    Steel producers that employ niche market strategies are continuously seeking to reduce production cost while maintaining a diverse product mix. The business model is typically based on marketing of high–strength special or stainless steels. However, the desire to avoid direct cost competition is over time gradually leading towards increased product variety and smaller order volumes (tonnes per order) for each product. This thesis analyses how production cost is linked to product variety in steel strip production. Results are based on new models for assessment of opportunities for performance improvement in high product–variety steel production. The need for flexible production processes increases with increasing product variety. Operational capabilities linked to process flexibility determine the extent to which steel producers can eliminate in–process inventory and accomplish close coupling between process steps. Niche market producers that invest in process flexibility improvements can lower production costs both due to reduced work–in–process and lower energy consumption. An additional benefit is reduced environmental impact. The following problems are addressed: • Development of a method to assess the influence of product variety on performance in steel production. • Development of models of continuous casting and hot rolling that account for product variety and cost effects with consideration of varying degrees of process flexibility. • Development of a strategy process model that focus on the strategic value of operational capabilities related to process flexibility. Investments in operational capabilities regarding process flexibility have a strategic impact. An appreciation for the effects of process flexibility should permeate the organisation’s daily work since the accumulated contribution of many, seemingly unimportant, incremental changes significantly influences the strategic opportunities of the company.

  • 286.
    Storck, Joakim
    et al.
    Högskolan Dalarna, Akademin Industri och samhälle, Materialvetenskap.
    Lindberg, Bengt
    A lean production strategy for hot charge operation of a steel mill2007Ingår i: IET Conference publications, Issue 528, 2007, 2007, Vol. 528, s. 158-167Konferensbidrag (Refereegranskat)
    Abstract [en]

    This paper aims to show how a strategy based on lean production can aid the implementation of hot-charge operation in steel strip production. Key parameters in a lean strategy for steel manufacturing are identified, and it is shown that lean production targets the difficulties that are traditionally associated with hot charging. Hot charging amounts to a closer level of integration of the continuous casting and hot rolling processes. The conclusions are that implementation of hot charging can be seen as a waste-reduction process within a lean production strategy, and that there are substantial cost savings to be made once the full benefits of a lean production strategy are considered.

  • 287.
    Storck, Joakim
    et al.
    Högskolan Dalarna, Akademin Industri och samhälle, Materialvetenskap.
    Lindberg, Bengt
    Assessment of best scheduling practice in continuous casting and hot rolling of stainless steel strip by system dynamics simulation2007Ingår i: Key Engineering Materials, ISSN 1013-9826, E-ISSN 1662-9795, Vol. 344, s. 897-904Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A rapid flow of materials with little intermediate buffering between steel mill and hot strip mill has many benefits. One is energy savings due to raised charging temperature in the reheat furnaces of the hot strip mill. Another is that tied capital is freed up, thereby improving mill economy. Still, it is not unusual that average lead-time is in the order of days, or even weeks. The aim of the present work was to show how lead-times from casting to rolling could be improved by changes in the scheduling function. A System Dynamics model of a stainless steel strip production facility with continuous caster and hot rolling mill was created. The model was used to study the dynamics of the system in response to changes in parameters that defined the scheduling configuration. More frequent schedule updating generally resulted in less work in process (WIP) and shorter lead times from casting to rolling, with resulting higher charging temperatures. The amount of oscillation in the system was also reduced. More frequent work roll changes were required when scheduling frequency increased, resulting in an increased fraction of setup time in relation to total processing time. Therefore, a development towards increased scheduling frequency may have to be complemented by efforts to reduce changeover times. The conclusion was that dynamic scheduling routines with frequent schedule updating result in better overall performance of the system due to lower WIP and better heat utilization. Dynamic scheduling routines with frequent updates make the system respond better to changes in the system and give better overall performance. The result is lower WIP, increased energy efficiency and less oscillation in the system.

  • 288. Surreddi, Kumar Babu
    et al.
    Bengtsson, Robin
    Department of Materials and Manufacturing Technology, Chalmers University of Technology, Gothenburg, Sweden .
    Nyborg, Lars
    Department of Materials and Manufacturing Technology, Chalmers University of Technology, Gothenburg, Sweden .
    PM Biomaterials: Production of porous NiTi bulk shape memory alloy by starch consolidation and sintering of pre-alloyed Powder2013Ingår i: European Congress and Exhibition on Powder Metallurgy. European PM Conference Proceedings, The European Powder Metallurgy Association , 2013, Vol. 3, s. 271-276Konferensbidrag (Refereegranskat)
  • 289.
    Surreddi, Kumar Babu
    et al.
    Chalmers University of Technology, Gothenburg.
    Björkeborn, Karin
    Department of Materials and Manufacturing Technology, Chalmers University of Technology, Gothenburg, Sweden .
    Klement, Uta
    Department of Materials and Manufacturing Technology, Chalmers University of Technology, Gothenburg, Sweden .
    Effect of heat treatment on chip formation in a case hardening steel2013Ingår i: Journal of Materials and Chemical Engineering, ISSN 2310-063X, Vol. 1, nr 1, s. 1-7Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In manufacturing industry, variations in machinability are regularly observed when producing the same part out of different material batches of a case hardening steel. Some batches result in variations in chip breakability which leads to a nonrobust production process with unforeseen stops of automatic machining process. The aim of the present study is to investigate the influence of the microstructure on chip formation in case hardening steel. Different microstructures were produced from the same batch of material by varying heat treatment. Chips were collected after machining at different feed rates and depths of cut. The cross sections of the chips have been analyzed with respect to overall deformation pattern, mean thickness, and degree of segmentation. Also, the influence of manganese sulfide on machinability has been investigated. The microstructural investigation of the chips has shown that there is a clear difference in the deformation behavior between a case hardening steel with larger and smaller pearlite nodular structure. Chips from the material with larger pearlite nodular size and lower amount of pro-eutectoid ferrite are by far more segmented as compared to chips from materials with smaller pearlite nodular size.

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  • 290.
    Surreddi, Kumar Babu
    et al.
    Högskolan Dalarna, Akademin Industri och samhälle, Materialteknik.
    Oikonomou, C.
    Uddeholms AB, SE-68385 Hagfors, Sweden..
    Karlsson, P.
    Orebro Univ, Dept Mech Engn, SE-70182 Orebro, Sweden..
    Olsson, Mikael
    Högskolan Dalarna, Akademin Industri och samhälle, Materialteknik.
    Pejryd, L.
    Orebro Univ, Dept Mech Engn, SE-70182 Orebro, Sweden..
    In-situ micro-tensile testing of additive manufactured maraging steels in the SEM: Influence of build orientation, thickness and roughness on the resulting mechanical properties2018Ingår i: La Metallurgia Italiana, ISSN 0026-0843, nr 3, s. 27-33Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Selective laser melting (SLM) is frequently used additive manufacturing technique capable of producing various complex parts including thin-wall sections. However the surface roughness is a limiting factor in thin sections produced by SLM process when strength is the main criterion. In this study, the influence of build orientation, thickness and roughness on the resulting mechanical properties of as-built test samples was investigated. Various thin sheets of EN 1.2709 maraging steel built in horizontal and vertical orientations produced by SLM were investigated using in-situ micro-tensile testing in a scanning electron microscope. The mechanical strength and deformation mechanisms were analyzed and explained based on thickness and build orientation. Increased ductility was observed in thicker samples as well as in the horizontal build samples. The results illustrate the potential of the in-situ test technique and aspects important to consider in design guidelines for thin AM structures.

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  • 291.
    Surreddi, Kumar Babu
    et al.
    Högskolan Dalarna, Akademin Industri och samhälle, Materialteknik.
    Oikonomou, Christos
    Karlsson, Patrik
    Olsson, Mikael
    Högskolan Dalarna, Akademin Industri och samhälle, Materialteknik.
    Pejryd, Lars
    In-situ Micro-tensile Testing of Additive Manufactured Maraging Steels in the SEM: Influence of Build Orientation, Thickness and Roughness on the Resulting Mechanical Properties2017Ingår i: Proceedings Euro PM 2017: International Powder Metallurgy Congress and Exhibition2017: Session 30: Mechanical Behaviour of AM Materials, 2017, artikel-id Session 30Konferensbidrag (Refereegranskat)
    Abstract [en]

    Selective laser melting (SLM) is frequently used additive manufacturing technique capable of producing various complex parts including thin-wall sections. However the surface roughness is a limiting factor in thin sections produced by SLM process when strength is the main criterion. In this study, the influence of build orientation, thickness and roughness on the resulting mechanical properties of as-built test samples was investigated. Various thin sheets of EN 1.2709 maraging steel built in horizontal and vertical orientations produced by SLM were investigated using in-situ micro-tensile testing in a scanning electron microscope. The mechanical strength and deformation mechanisms were analyzed and explained based on thickness and build orientation. Increased ductility was observed in thicker samples as well as in the horizontal build samples. The results illustrate the potential of the in-situ test technique and aspects important to consider in design guidelines for thin AM structures.

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  • 292.
    Surreddi, Kumar Babu
    et al.
    Högskolan Dalarna, Akademin Industri och samhälle, Materialteknik.
    Olsson, Mikael
    Högskolan Dalarna, Akademin Industri och samhälle, Materialteknik.
    Wear of cemented carbide nibs in steel wire drawing2018Ingår i: The 18th Nordic Symposium on Tribology – NORDTRIB 2018 / [ed] Prof. Staffan Jacobson, 2018Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    The tribological interaction between a cemented carbide drawing die and a steel wire under lubricated wire drawing conditions has been characterized using 3D optical surface profilometry, scanning electron microscopy and energy dispersive X-ray spectroscopy. The results show that wear of the cemented carbides mainly is located to three different wear zones, i) at the entrance of the reduction zone, ii) at the exit of the reduction zone/ entrance of the bearing zone and iii) at the exit of the bearing zone. In the first wear zone, wear of the cemented carbide occurs on a WC grain size level and is controlled by plastic deformation, cracking and fragmentation of individual WC grains. In the second wear zone, wear of the cemented carbide is controlled by chipping of small WC/Co composite fragments resulting in craters, ~ 10μm in diameter.

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  • 293.
    Surreddi, Kumar Babu
    et al.
    IFW Dresden, Institut für Komplexe Materialien.
    Scudino, Sergio
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Nikolowski, K
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Stoica, Mihai
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Sakaliyska, Miroslava
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Gemming, T
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Eckert, Jürgen
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Nguyen, H V
    Research Center for Machine Parts and Materials Processing, University of Ulsan, San 29, 680749 Ulsan Korea.
    Kim, J S
    Research Center for Machine Parts and Materials Processing, University of Ulsan, San 29, 680749 Ulsan Korea.
    Vierke, J
    Hahn-Meitner-Institut Berlin, Glienicker Strasse 100, 14109 Berlin Germany.
    Spark plasma sintering of gas atomized Al87Ni8La5 amorphous powder2009Ingår i: Journal of Physics: Conference Series, ISSN 1742-6588Artikel i tidskrift (Refereegranskat)
  • 294.
    Surreddi, Kumar Babu
    et al.
    IFW Dresden, Institut für Komplexe Materialien.
    Scudino, Sergio
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Sakaliyska, Mira
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Prashanth, Konda Gokuldoss
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Sordelet, D J
    Advanced Materials Technology Group, Caterpillar Inc.Mossville, USA.
    Eckert, Jürgen
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Crystallization behavior and consolidation of gas-atomized Al84Gd6Ni7Co3 glassy powder2010Ingår i: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 491, nr 1-2, s. 137-142Artikel i tidskrift (Refereegranskat)
  • 295.
    Surreddi, Kumar Babu
    et al.
    IFW Dresden, Institut für Komplexe Materialien.
    Srivastava, Vikas C
    National Metallurgical Laboratory, Jamshedpur-831 007, India.
    Scudino, Sergio
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Sakaliyska, Miroslava
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Uhlenwinkel, Volker
    Institut für Werkstofftechnik, Universität Bremen, Badgasteiner Str. 3, D-28359 Bremen, Germany.
    Kim, Ji Soon
    Research Center for Machine Parts and Materials Processing, University of Ulsan, San 29, 680749 Ulsan Korea.
    Eckert, Jürgen
    IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden, Germany.
    Production of high-strength Al85Y8Ni5Co2 bulk alloy by spark plasma sintering2010Ingår i: Journal of Physics: Conference Series, ISSN 1742-6588, nr 1Artikel i tidskrift (Refereegranskat)
  • 296.
    Surreddi, Kumar Babu
    et al.
    Chalmers University of Technology, Gothenburg.
    Vattur Sundaram, Maheswaran
    Department of Materials and Manufacturing Technology, Chalmers University of Technology, Gothenburg, Sweden .
    Hryha, Eduard
    Department of Materials and Manufacturing Technology, Chalmers University of Technology, Gothenburg, Sweden .
    Karlsson, Henrik
    Volvo Group Trucks Technology, Gothenburg, Sweden.
    Andersson, Michael
    Höganäs AB, Höganäs, Sweden.
    Nyborg, Lars
    Department of Materials and Manufacturing Technology, Chalmers University of Technology, Gothenburg, Sweden .
    Sintered Steels-Tailored Mechanical Properties: Low Temperature Creep Behavior of PM Components Under Static Load Conditions2013Ingår i: European Congress and Exhibition on Powder Metallurgy. European PM Conference Proceedings, The European Powder Metallurgy Association , 2013Konferensbidrag (Refereegranskat)
  • 297.
    Surreddi, Kumar Babu
    et al.
    Högskolan Dalarna, Akademin Industri och samhälle, Materialteknik.
    Yvell, Karin
    Högskolan Dalarna, Akademin Industri och samhälle, Materialteknik.
    Norgren, Susanne
    Sandvik Mining and Rock Technology, Rock Tools division, Sweden; Department of Engineering Sciences, Uppsala University, Sweden.
    Olsson, Mikael
    Högskolan Dalarna, Akademin Industri och samhälle, Materialteknik.
    Characterization of surface degradation and wear damage Of cemented carbide in rock drilling2018Ingår i: The 18th Nordic Symposium on Tribology – NORDTRIB 2018 / [ed] Prof. Staffan Jacobson, 2018Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    In this work, worn top hammer drill bit buttons after underground drifting in Granodiorite are analysed using scanning electron microscopy (SEM), Auger electron spectroscopy (AES) and electron backscatter diffraction (EBSD) to understand the dominant surface failure and wear mechanisms on the flank wear land region, i.e. the outer side of the gauge row cemented carbide buttons. SEM shows that the worn surface of the flank wear land is partly covered with islands of a thin rock material transfer layer and that the exposed cemented carbide show deformed, cracked and fragmented WC grains. AES gives that the transferred rock material is mainly located on the surface but may penetrate into cemented carbide microstructure to a depth of 1-2 WC grain diameters. Finally, EBSD reveals that the deformation of the cemented carbide in the flank wear land region is located to a thin zone, about ~10 μm in depth.

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  • 298.
    Sveen, Susanne
    et al.
    Högskolan Dalarna, Akademin Industri och samhälle, Materialteknik. Linköping University, SE-581 83 Linköping, Sweden.
    Andersson, J
    Seco Tools.
    M’Sauobi, R
    Seco Tools.
    Olsson, Mikael
    Högskolan Dalarna, Akademin Industri och samhälle, Materialteknik.
    Scratch adhesion characteristics of PVD TiAlN deposited on high speed steel, cemented carbide and PCBN substrates2013Ingår i: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 308, nr 1-2, s. 133-141Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Modern tool materials, ranging from powder metallurgical high speed steel to super hard materials such as polycrystalline cubic boron nitride and diamond, are used as cutting tools in the metal cutting industry. In order to further improve the cutting performance, these tools are frequently coated by thin, hard PVD coatings such as TiN, TiAlN, AlCrO3, etc. In order to develop and design new PVD coatings it is important to characterize the mechanical properties of the coatings and understand the coating/substrate deformation mechanisms in a tribological contact, e.g. metal cutting. For example, it is important to be aware that the mechanical properties of the substrate (tool material) have a significant impact on the practical coating adhesion and the coating failure mechanisms.

    In the present study scratch testing has been used in order to evaluate to increase the understanding of the mechanical response and potential coating failure modes of cathodic arc evaporated TiAlN deposited on high speed steel, cemented carbide and polycrystalline cubic boron nitride. Post-test characterization of the scratched samples using optical profilometry, scanning electron microscopy and energy dispersive X-ray spectroscopy were performed and the cohesive and adhesive surface failure mechanisms are described and related to the substrate material properties. The results clearly show that, although all substrate materials can be regarded as hard, they result in completely different coating failure mechanisms at the normal load corresponding to substrate exposure. Also, coating failure resulting in substrate exposure does not necessarily correspond to interfacial cracking resulting in adhesive fracture along the coating-substrate interface.

  • 299.
    Sveen, Susanne
    et al.
    Högskolan Dalarna, Akademin Industri och samhälle, Materialteknik. Linköpings Universitet.
    M’Sauobi, R
    Seco Tools.
    Bexell, Ulf
    Högskolan Dalarna, Akademin Industri och samhälle, Materialteknik.
    Olsson, Mikael
    Högskolan Dalarna, Akademin Industri och samhälle, Materialteknik.
    PCBN hard turning of ball bearing steel: Influence of PVD coating deposition on tool wear and surface finish/surface integrity of machined surfaceManuskript (preprint) (Övrigt vetenskapligt)
  • 300.
    Svensson, Jennie
    Högskolan Dalarna, Akademin Industri och samhälle, Materialteknik. KTH, Tillämpad processmetallurgi.
    An Experimental Study to Improve the Casting Performance of Steel Grades Sensitive for Clogging2017Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
    Abstract [en]

    In this study, the goal is to optimize the process and to reduce the clogging tendency during the continuous casting process. The focus is on clogging when the refractory base material (RBM) in the SEN is in contact with the liquid steel. It is difficult or impossible to avoid non-metallic inclusions in the liquid steel, but by a selection of a good RBM in the SEN clogging can be reduced.

     

    Different process steps were evaluated during the casting process in order to reduce the clogging tendency. First, the preheating of the SEN was studied. The results showed that the SEN can be decarburized during the preheating process. In addition, decarburization of SEN causes a larger risk for clogging. Two types of plasma coatings were implemented to protect the RBM, to prevent reactions with the RBM, and to reduce the clogging tendency. Calcium titanate (CaTiO3) mixed with yttria stabilized zirconia (YSZ) plasma coatings were tested in laboratory and pilot plant trials, for casting of aluminium-killed low-carbon steels. For casting of cerium alloyed stainless steels, YSZ plasma coatings were tested in laboratory, pilot plant and industrial trials. The results showed that the clogging tendency was reduced when implementing both coating materials.

     

    It is also of importance to produce clean steel in order to reduce clogging. Therefore, the steel cleanliness in the tundish was studied experimentally. The result showed that inclusions originated from the slag, deoxidation products and tundish refractory and that they were present in the tundish as well as in the final steel product.

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