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  • 301.
    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 particles2010In: Journal of Physics: Conference Series, ISSN 1742-6588, no 1Article in journal (Refereed)
  • 302.
    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 alloys2009In: Intermetallics, ISSN 0966-9795, Vol. 17, no 7, p. 532-539Article in journal (Refereed)
  • 303.
    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 heterogeneities2011In: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 65, no 9, p. 815-818Article in journal (Refereed)
  • 304.
    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 glass2011In: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 509Article in journal (Refereed)
  • 305.
    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 metallurgy2009In: Acta Materialia, ISSN 1359-6454, E-ISSN 1873-2453, Vol. 57, no 6, p. 2029-2039Article in journal (Refereed)
  • 306.
    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 properties2009In: Acta Materialia, ISSN 1359-6454, E-ISSN 1873-2453, Vol. 57, no 15, p. 4529-4538Article in journal (Refereed)
  • 307.
    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 alloys2009In: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 483, no 1-2, p. 2-7Article in journal (Refereed)
  • 308.
    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 alloys2009In: Journal of Physics: Conference Series, ISSN 1742-6588, Vol. 144, no 1Article in journal (Refereed)
  • 309.
    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 powders2008In: Physica Status Solidi. Rapid Research Letters, ISSN 1862-6254, E-ISSN 1862-6270, Vol. 2, no 6, p. 272-274Article in journal (Refereed)
  • 310.
    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 casting2010In: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 504, p. S483-S486Article in journal (Refereed)
  • 311.
    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 glass2010In: Physica Status Solidi (a) applications and materials science, ISSN 1862-6300, E-ISSN 1862-6319, Vol. 207, no 5, p. 1118-1121Article in journal (Refereed)
  • 312.
    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 Compression2010In: Advanced Engineering Materials, ISSN 1438-1656, E-ISSN 1527-2648, Vol. 12, no 11, p. 1123-1126Article in journal (Refereed)
  • 313.
    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 powders2009In: Journal of Materials Research, ISSN 0884-2914, E-ISSN 2044-5326, Vol. 24, no 9, p. 2909-2916Article in journal (Refereed)
  • 314.
    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 composites2008In: Journal of Materials Science, ISSN 0022-2461, E-ISSN 1573-4803, Vol. 43, no 13, p. 4518-4526Article in journal (Refereed)
  • 315.
    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 restraints2010In: Scripta Materialia, ISSN 1359-6462, E-ISSN 1872-8456, Vol. 62, no 10, p. 750-753Article in journal (Refereed)
  • 316.
    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 ribbons2009In: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 483, no 1-2, p. 227-230Article in journal (Refereed)
  • 317.
    Selo Mustafa, Muhammed
    et al.
    Dalarna University, School of Technology and Business Studies, Material Science.
    Osterman, Jesper
    Dalarna University, School of Technology and Business Studies, Material Science.
    Tunell, Helena
    Dalarna University, School of Technology and Business Studies, Material Science.
    Skarp, Kent
    Dalarna University, School of Technology and Business Studies, Material Science.
    Kozlovsky, M.
    Synthesis, spectroscopic characterisation and alignment of novel azobenzene containing monomers2005In: Liquid crystals (Print), ISSN 0267-8292, E-ISSN 1366-5855, Vol. 32, no 7, p. 901-908Article in journal (Refereed)
    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.

  • 318.
    Sepehr, Omid
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Optimering av härdrecept – En förstudie2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    SKF has installed a relative new heat treatment line for large dimensions in Gothenburg. The line is a quality and capacity increasing investment which primarily will supply the European market. Currently there are three hardening recipes used to meet the range of large dimensions with the right quality according to SKF’s internal standard. Now, SKF wants to improve the recipes further by investigating the possibility of creating more specific hardening recipes based on the composition. To succeed with this, it is necessary to obtain knowledge regarding the composition’s impact on the hardening. One of the quality requirements is that the entire part has a lower bainitic structure. The material property which is crucial to know about is the hardenability. The hardenability is a measure of how thick dimensions that can be fully hardened, which is influenced by both the composition and the austenitizing treatment.

    In this thesis, the composition's contribution to the hardenability and the effect of alloy variations on hardenability has been investigated. The steel supplier’s composition variation for respective material standard is well controlled and do not affect the hardenability for the recommended goods dimensions. The steel supplier can therefore guarantee fully hardening of a certain thickness. The investigation made in this thesis show that this recommended thickness is exceeded and this must somehow be compensated. A low hardenability can effectively be offset by a temperature increase, but this is limited by strength requirements. Whether the correct treatment parameters are selected for compensation must be examined, which has been proposed in this work.

  • 319.
    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 compacts2016In: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 661, p. 294-305Article in journal (Refereed)
  • 320. Singh, N.
    et al.
    Ummethala, Raghunandan
    Surreddi, Kumar Babu
    Dalarna University, School of Information and Engineering, Materials Technology.
    Jayamani, Jayaraj
    Dalarna University, School of Information and Engineering, Materials Technology.
    Sokkalingam, Rathinavelu
    Rajput, Monika
    Chatterjee, Kaushik
    Prashanth, K.G.
    Effect of TiB2 addition on the mechanical and biological response of spark plasma sintered Ti6Al7Nb matrix composites2022In: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 924, p. 166502-166502, article id 166502Article in journal (Refereed)
  • 321.
    Skalare, Henrik
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Optimering av patenteringsprocess: En undersökning om blypatentering2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    When producing thin spring- and piano wire the method used in the heat treatment process is called “lead patenting”. During the method you want the coarse lamellar structure of pearlite to become fine. The first step in the process is to heat the wire in to the austenite range. After the wire has reached the temperature of ca 900 ˚C in the oven it´s drawn into a bath of liquefied lead. The bath cools down the wire to a temperature of approximately 530 ˚C. The result of the heat treatment process will show fine plates of ferrite and cementite in the microstructure. The degree project will analyze the microstructures after the heat treatment in Springwire AB process. To analyze the microstructure of the material different test methods have been used. If the study finds any flaws in the microstructures of the materials or in the process these will be adjusted during the project. The microstructures that’s been analyzed in this study shows the structure of fine pearlite with small carbides of cementite. After the analysis of the microstructure the conclusion reached that the speeds in the heat treatment process are a bit high compared to the theoretical paces. Different kinds of suggestions has been presented to improve the process.

  • 322. Sokkalingam, Rathinavelu
    et al.
    Chao, Zhao
    Sivaprasad, Katakam
    Muthupandi, Veerappan
    Jayamani, Jayaraj
    Dalarna University, School of Information and Engineering, Materials Technology.
    Ramasamy, Parthiban
    Eckert, Juergen
    Prashanth, Konda Gokuldoss
    Additive Manufacturing of CoCrFeMnNi High-Entropy Alloy/AISI 316L Stainless Steel Bimetallic Structures2022In: Advanced Engineering Materials, ISSN 1438-1656, E-ISSN 1527-2648, article id 2200341Article in journal (Refereed)
    Abstract [en]

    CoCrFeMnNi high-entropy alloy (HEA)/AISI 316L stainless steel bimetals were additively fabricated using selective laser melting (SLM). The bimetal structure comprises three regions, i.e., CoCrFeMnNi-HEA, AISI 316L stainless steel, and an interface between CoCrFeMnNi-HEA, AISI 316L stainless steel. SLM processing results in the formation of columnar grains extending over many built layers epitaxially in a preferential growth direction. The Vickers microhardness ranges mainly between 250 and 275 HV0.5 in all three observed regions. In addition, only a marginal variation in tensile strength is observed between the CoCrFeMnNi-HEA, AISI 316L stainless steel, and the CoCrFeMnNi-HEA/AISI 316L stainless steel bimetal. The unique higher work hardening behavior of the CoCrFeMnNi-HEA prevents failure along the CoCrFeMnNi-HEA side in the bimetallic structure during plastic deformation. The CoCrFeMnNi-HEA shows higher pitting susceptibility than the AISI 316L stainless steel in the bimetallic structure due to its lower pitting potential. Further, the presence of pores and lack of fusion spots further decreases the pitting resistance of the CoCrFeMnNi-HEA. Hence, the bimetal is prone to more preferential corrosion attack along the CoCrFeMnNi-HEA side due to its anodic behavior and defects.

  • 323.
    Sokkalingam, Rathinavelu
    et al.
    Advanced Materials Processing Laboratory, Department of Metallurgical and Materials Engineering, National Institute of Technology, Tiruchirappalli620015, Tamil Nadu, India.
    Tarraste, Marek
    Department of Mechanical and Industrial Engineering, Tallinn University of Technology, 19086 Tallinn, Estonia.
    Surreddi, Kumar Babu
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Mikli, Valdek
    Department of Materials and Environmental Technology, Tallinn University of Technology, 19086 Tallinn, Estonia.
    Muthupandi, Veerappan
    Advanced Materials Processing Laboratory, Department of Metallurgical and Materials Engineering, National Institute of Technology, Tiruchirappalli620015, Tamil Nadu, India.
    Sivaprasad, Katakam
    Advanced Materials Processing Laboratory, Department of Metallurgical and Materials Engineering, National Institute of Technology, Tiruchirappalli620015, Tamil Nadu, India.
    Prashanth, Konda Gokuldoss
    Department of Mechanical and Industrial Engineering, Tallinn University of Technology, 19086 Tallinn, Estonia.
    Powder metallurgy of Al0.1CoCrFeNi high-entropy alloy2020In: Journal of Materials Research, ISSN 0884-2914, E-ISSN 2044-5326, Vol. 35, no 21, p. 2835-2847Article in journal (Refereed)
    Abstract [en]

    Al0.1CoCrFeNi high-entropy alloy (HEA) was synthesized successfully from elemental powders by mechanical alloying (MA) and subsequent consolidation by spark plasma sintering (SPS). The alloying behavior, microstructure, and mechanical properties of the HEA were assessed using X-ray diffraction, electron microscope, hardness, and compression tests. MA of the elemental powders for 8 h has resulted in a two-phased microstructure: α-fcc and β-bcc phases. On the other hand, the consolidated bulk Al0.1CoCrFeNi-HEA sample reveals the presence of α-fcc and Cr23C6 phases. The metastable β-bcc transforms into a stable α-fcc during the SPS process due to the supply of thermal energy. The hardness of the consolidated bulk HEA samples is found to be 370 ± 50 HV0.5, and the yield and ultimate compressive strengths are found to be 1420 and 1600 MPa, respectively. Such high strength in the Al0.1CoCrFeNi HEA is attributed to the grain refinement strengthening.

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  • 324.
    Sokkalingam, Rathinavelu
    et al.
    Advanced Materials Processing Laboratory, Department of Metallurgical and Materials Engineering, National Institute of Technology, Tiruchirappalli, Tamil Nadu, India.
    Tarraste, Marek
    Department of Mechanical and Industrial Engineering, Tallinn University of Technology, Tallinn, Estonia.
    Surreddi, Kumar Babu
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Traksmaa, Rainer
    Department of Mechanical and Industrial Engineering, Tallinn University of Technology, Tallinn, Estonia.
    Muthupandi, Veerappan
    Advanced Materials Processing Laboratory, Department of Metallurgical and Materials Engineering, National Institute of Technology, Tiruchirappalli, Tamil Nadu, India.
    Sivaprasad, Katakam
    Advanced Materials Processing Laboratory, Department of Metallurgical and Materials Engineering, National Institute of Technology, Tiruchirappalli, Tamil Nadu, India.
    Prashanth, Konda Gokuldoss
    Department of Mechanical and Industrial Engineering, Tallinn University of Technology, Tallinn, Estonia Erich Schmid Institute of Materials Science, Leoben, Austria CBCMT, School of Mechanical Engineering, Vellore Institute of Technology, Vellore, India.
    Microstructure and properties of in-situ high entropy alloy/tungsten carbide composites by mechanical alloying.2020In: Material Design & Processing Communications, ISSN 2577-6576, Vol. n/a, no n/a, p. 1-9Article in journal (Refereed)
    Abstract [en]

    Abstract Al0.1CoCrFeNi-high entropy alloy (HEA) /tungsten carbide (WC)metal matrix composite was successfully prepared by mechanical alloying and subsequent spark plasma sintering. The different volume fraction of WC was distributed evenly by varying the powder milling parameters from gentle milling (~1.37% WC) and intensive milling (~14.27% WC). Sintering of gently milled powder has resulted in the evolution of three-phased microstructure: α-fcc and Cr- rich σ-phase with some WC-phase distributed in the HEA matrix. On the other hand, the sintering of intensively milled powder has resulted in a two-phased microstructure: α-fcc phase with even and dense distribution of WC-phased particles without any Cr- rich σ-phase. The absence of σ-phase is attributed to a complete alloying of Cr in the HEA matrix. Microhardness analysis and compression test indicate that a ~ 13% difference in WC fraction has resulted in an enhancement in hardness (46%) and compressive strength (~ 500 MPa).

  • 325.
    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 glass2011In: Intermetallics, ISSN 0966-9795, Vol. 19, no 10, p. 1394-1398Article in journal (Refereed)
  • 326.
    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 system2013In: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 578, p. 471-480Article in journal (Refereed)
  • 327.
    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 forming2010In: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 527, no 10-11, p. 2747-2758Article in journal (Refereed)
  • 328.
    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 alloys2009In: International conference on Spray forming 2009, 2009Conference paper (Refereed)
  • 329.
    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 structures2009In: Transactions of the Indian Institute of Metals, ISSN 0972-2815, E-ISSN 0975-1645, Vol. 62, no 4-5, p. 331-335Article in journal (Refereed)
  • 330.
    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 Al83La5Y5Ni5Co22009In: Metallurgical and Materials Transactions. A, ISSN 1073-5623, E-ISSN 1543-1940, Vol. 40, no 2, p. 450-461Article in journal (Refereed)
  • 331.
    Ssemakula, Hamzah
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Minimization of stock weight during close-die forging of a spindle2013In: Materials Sciences and Applications, ISSN 2153-117X, E-ISSN 2153-1188, Vol. 4, p. 217-224Article in journal (Refereed)
    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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  • 332. Stanciu, V.
    et al.
    Wilhelmsson, O.
    Bexell, Ulf
    Dalarna University, School of Technology and Business Studies, Material Science.
    Adell, M.
    Sadowski, J.
    Kanski, J.
    Warnicke, P.
    Svedlindh, P.
    Influence of annealing parameters on the ferromagnetic properties of optimally passivated (Ga,Mn)As epilayers2005In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 72, no 12, article id 125324Article in journal (Refereed)
    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

  • 333.
    Stenström, Mikael
    Dalarna University, School of Technology and Business Studies, Material Science.
    Deposited copper as lubrication when drawing of titanium wire; a study of method.2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    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.

  • 334.
    Stjärne, Linice
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Materialanalys och jämförelse av badrumsskåp från tre olika tillverkare2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This report is based on a thesis carried out in collaboration with CSI Nordic AB. The work has been done to help a client to get more knowledge and information about one of its own products, a bathroom cabinet, and also two competitors bathroom cabinets.

    The report contains a material analysis of the three bathroom cabinets, which because of an anonymity request are named A, B and C.

    The tests that have been performed is humidity test, tensile test, hardness test and scratch test. Structural analyzes of the steels and chemical analyzes of the materials and surface coatings have also been carried out.

    The results shows that the bathroom cabinets are made of equivalent steel, ie, the steels have very small differences in chemical composition and mechanical properties. Cabinet A shows distinct differences in structure and hardness of samples taken longitudinal or transverse the rolling direction.

    The scratch test shows that cabinet B and cabinet C don’t have as good scratch resistance as cabinet A. The scratch resistance depends on the paints composition, properties and adhesion.

    The chemical analysis of the coatings shows that cabinet A and B have a zinc coating, while cabinet C has a zinc phosphate coating. Cabinet C was also the only cabinet that showed local corrosion after the humidity test.

  • 335.
    Storck, Joakim
    Dalarna University, School of Technology and Business Studies, Material Science.
    Exploring improvement trajectories with dynamic process cost modelling: a case from the steel industry2010In: International Journal of Production Research, ISSN 0020-7543, E-ISSN 1366-588X, Vol. 48, no 12, p. 3493-3511Article in journal (Refereed)
    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.

  • 336.
    Storck, Joakim
    Dalarna University, School of Technology and Business Studies, Material Science.
    Product variety and upstream versus downstream flexibility2009In: Proceedings of the International 3'rd Swedish Production Symposium / [ed] Rosén, B.G., Göteborg, 2009, p. 304-309Conference paper (Refereed)
    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.

  • 337.
    Storck, Joakim
    Dalarna University, School of Technology and Business Studies, Material Science.
    Product variety, flexibility and energy use in hot rolling mills2012In: 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, p. 80-85Conference paper (Refereed)
    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.

  • 338.
    Storck, Joakim
    Dalarna University, School of Technology and Business Studies, Material Science.
    Stålforskningsdagar 2011: Materialteknik vid Högskolan Dalarna2011Book (Other academic)
  • 339.
    Storck, Joakim
    et al.
    Dalarna University, School of Technology and Business Studies, Material Science.
    Lindberg, Bengt
    KTH.
    A Dynamic Cost Model for the Effect of Improved Process Flexibility in Steel Plants2008In: Proceedings of the 41st CIRP Conference on Manufacturing Systems, Tokyo, Japan, 2008Conference paper (Refereed)
    Abstract [en]

    Reduced setup times in the rolling mill generate flexibility which allows shorter leadtimes through continuous casting and hot rolling. Traditionally known as schedule-free rolling, this flexibility allows the rolling mill to handle variations without the need for buffering. Cost models based on system dynamics methodology are used to assess the economic potential. Effects on inventory, energy and work roll consumptions are analysed. The simulation results show that investments in flexible processes can be evaluated with dynamic cost models. There is an opportunity for significant cost reduction, but also lowered environmental impact due to reduced energy consumption.

  • 340.
    Storck, Joakim
    et al.
    Dalarna University, School of Technology and Business Studies, Material Science.
    Lindberg, Bengt
    A lean production strategy for hot charge operation of a steel mill2007In: IET Conference publications, Issue 528, 2007, 2007, Vol. 528, p. 158-167Conference paper (Refereed)
    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.

  • 341.
    Storck, Joakim
    et al.
    Dalarna University, School of Technology and Business Studies, Material Science.
    Lindberg, Bengt
    Assessment of best scheduling practice in continuous casting and hot rolling of stainless steel strip by system dynamics simulation2007In: Key Engineering Materials, ISSN 1013-9826, E-ISSN 1662-9795, Vol. 344, p. 897-904Article in journal (Refereed)
    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.

  • 342. 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 Powder2013In: European Congress and Exhibition on Powder Metallurgy. European PM Conference Proceedings, The European Powder Metallurgy Association , 2013, Vol. 3, p. 271-276Conference paper (Refereed)
  • 343.
    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 steel2013In: Journal of Materials and Chemical Engineering, ISSN 2310-063X, Vol. 1, no 1, p. 1-7Article in journal (Refereed)
    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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  • 344.
    Surreddi, Kumar Babu
    et al.
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Oikonomou, C.
    Uddeholms AB, SE-68385 Hagfors, Sweden..
    Karlsson, P.
    Orebro Univ, Dept Mech Engn, SE-70182 Orebro, Sweden..
    Olsson, Mikael
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    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 properties2018In: La Metallurgia Italiana, ISSN 0026-0843, no 3, p. 27-33Article in journal (Refereed)
    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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  • 345.
    Surreddi, Kumar Babu
    et al.
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Oikonomou, Christos
    Karlsson, Patrik
    Olsson, Mikael
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    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 Properties2017In: Proceedings Euro PM 2017: International Powder Metallurgy Congress and Exhibition2017: Session 30: Mechanical Behaviour of AM Materials, 2017, article id Session 30Conference paper (Refereed)
    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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  • 346.
    Surreddi, Kumar Babu
    et al.
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Olsson, Mikael
    Dalarna University, School of Technology and Business Studies, Materials Technology.
    Wear of cemented carbide nibs in steel wire drawing2018In: The 18th Nordic Symposium on Tribology – NORDTRIB 2018 / [ed] Prof. Staffan Jacobson, 2018Conference paper (Other academic)
    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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  • 347.
    Surreddi, Kumar Babu
    et al.
    Dalarna University, School of Information and Engineering, Materials Technology.
    Sanni, O. C.
    Brodin, H.
    Microstructure and mechanical behavior of as-built and heat-treated Hastelloy-X alloy produced by Laser Powder Bed Fusion process2022In: Procedia CIRP, Elsevier B.V. , 2022, Vol. 111, p. 373-376Conference paper (Refereed)
    Abstract [en]

    In this study,microstructure and mechanical characterization of as-built Hastelloy X (HX) samples produced by laser powder bed fusion (LPBF) process and post-heat-treated samples were investigated. Two sets of samples, horizontal and vertical to build direction, were considered in as-built condition to understand the effect of build direction and two solution heat-treatment temperatures, 1177°C and 1220°C, followed by fast cooling were considered to study the effect of solution heat-treatment temperature on microstructure and mechanical properties. Microstructure characterization of as-built sample horizontal to build direction revealed a typical multi-layer molten pool boundaries and the sample vertical to build direction revealed multi-layered and multi-tracked molten pool boundaries. Electron backscatter diffraction results reveal a disrupted epitaxial grain growth for the as-built samples vertical to build direction whereas equiaxed grain structure with varying twin grain boundary fractions was observed for heat-treated HX samples. As-built LPBF HX samples exhibit higher mean hardness and yield strength than post-heat-treated samples. Higher elongation and lower yield strength were observed for the sample solution treated at 1220°C as compared to the sample solution annealed at 1177°C. Microstructural evolution at 20% engineering strain for the exact positions before the tensile test was presented for solution treated at 1220°C samples, which reveals distinct slip lines within each grain as well as increased dislocation density at grain boundaries. © 2022 The Authors. Published by Elsevier B.V.

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    fulltext
  • 348.
    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 powder2009In: Journal of Physics: Conference Series, ISSN 1742-6588Article in journal (Refereed)
  • 349.
    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 powder2010In: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 491, no 1-2, p. 137-142Article in journal (Refereed)
  • 350.
    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 sintering2010In: Journal of Physics: Conference Series, ISSN 1742-6588, no 1Article in journal (Refereed)
456789 301 - 350 of 419
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