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Surreddi, Kumar Babu, DocentORCID iD iconorcid.org/0000-0001-7938-9909
Biography [eng]
  • Research experience in various materials science topics, especially powder metallurgy, microstructure-property relationships, steels, and tribology.
  • Theoretical and practical knowledge with various scientific equipment, especially in X-ray diffraction, differential scanning calorimetry, dilatometry, scanning electron microscopy, EBSD, X-ray photoelectron spectroscopy, auger electron spectroscopy and in various mechanical testing equipment.
Biography [swe]

Forskning i Tribologi, Stål formning, Structure-Property relationen och additiv tillverkning. Mina arbetsuppgifter på Materialteknik som Univ lektor materialteknik är att lära materialteknik kurser för Högskoleingenjörsprogram-Materialteknik och magisterprogram - Tillämpad material- and Ytteknik.

Publications (10 of 14) Show all publications
Gyhlesten Back, J. & Surreddi, K. B. (2019). Microstructure analysis of martensitic low alloy carbon steel samples subjected to deformation dilatometry. Materials Characterization, 157, Article ID 109926.
Open this publication in new window or tab >>Microstructure analysis of martensitic low alloy carbon steel samples subjected to deformation dilatometry
2019 (English)In: Materials Characterization, ISSN 1044-5803, E-ISSN 1873-4189, Vol. 157, article id 109926Article in journal (Refereed) Published
National Category
Materials Engineering
Research subject
Steel Forming and Surface Engineering
Identifiers
urn:nbn:se:du-30820 (URN)10.1016/j.matchar.2019.109926 (DOI)2-s2.0-85072225193 (Scopus ID)
Available from: 2019-09-27 Created: 2019-09-27 Last updated: 2019-09-27Bibliographically approved
Habainy, J., Lee, Y., Surreddi, K. B., Prosvetov, A., Simon, P., Iyengar, S., . . . Tomut, M. (2019). Study of heavy ion beam induced damage in tungsten for high power target applications. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 439, 7-16
Open this publication in new window or tab >>Study of heavy ion beam induced damage in tungsten for high power target applications
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2019 (English)In: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, ISSN 0168-583X, E-ISSN 1872-9584, Vol. 439, p. 7-16Article in journal (Refereed) Published
Abstract [en]

The spallation material at ESS is pure tungsten, which is cooled by gaseous helium flow. To study the behaviour of tungsten under dynamic beam conditions at ESS, pure tungsten specimens have been irradiated at the M3-beamline of the UNILAC facility at GSI Helmholtz Centre for Heavy Ion Research. Tungsten specimens of two thicknesses, 26 μm and 3 mm, were exposed to pulsed uranium and gold ion beams for fluences up to 7.5 · 1013 ions·cm−2 at 4.8 MeV/nucleon. Nanoindentation tests were performed on the cross section of the irradiated 3 mm sample, and microhardness was measured on the top surface. The measured data are compared with the calculated damage values, and a correlation between the radiation induced damage and the observed mechanical property is presented. Thermal diffusivities of foil samples irradiated up to four different fluences were measured with a Laser Flash Apparatus (LFA). The observed changes in the mechanical and thermal properties of irradiated tungsten were used to estimate the changes of operational temperature and mechanical stresses in the ESS target material with the progress of radiation damage, using coupled thermal and mechanical simulations. From the pulsed beam induced dynamic oscillations of thin tungsten specimens, information on fatigue properties of tungsten under irradiation was drawn. In addition to pure tungsten, oxidised tungsten samples were irradiated. This is to investigate the stability of the adhesive oxide layer under pulsed beam conditions, which would be formed due to oxygen impurities in the helium cooling loop. The irradiated oxide scale was examined using Auger Electron Spectroscopy (AES) and Scanning Electron Microscopy (SEM). 

Keywords
Heavy ion irradiation, Radiation damage, Spallation target, Tungsten
National Category
Materials Engineering
Research subject
Steel Forming and Surface Engineering
Identifiers
urn:nbn:se:du-29009 (URN)10.1016/j.nimb.2018.11.017 (DOI)000455693100003 ()2-s2.0-85056565078 (Scopus ID)
Available from: 2018-12-04 Created: 2018-12-04 Last updated: 2019-02-01Bibliographically approved
Surreddi, K. B., Yvell, K., Norgren, S. & Olsson, M. (2018). Characterization of surface degradation and wear damage Of cemented carbide in rock drilling. In: Prof. Staffan Jacobson (Ed.), The 18th Nordic Symposium on Tribology – NORDTRIB 2018: . Paper presented at The 18th Nordic Symposium on Tribology – NORDTRIB 2018, 18-21 June 2018, Uppsala University, Uppsala, Sweden.
Open this publication in new window or tab >>Characterization of surface degradation and wear damage Of cemented carbide in rock drilling
2018 (English)In: The 18th Nordic Symposium on Tribology – NORDTRIB 2018 / [ed] Prof. Staffan Jacobson, 2018Conference paper, Oral presentation with published abstract (Other academic)
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.

Keywords
Wire drawing; Cemented carbide; Surface degradation; Wear mechanisms
National Category
Materials Engineering
Research subject
Steel Forming and Surface Engineering
Identifiers
urn:nbn:se:du-28028 (URN)
Conference
The 18th Nordic Symposium on Tribology – NORDTRIB 2018, 18-21 June 2018, Uppsala University, Uppsala, Sweden
Projects
Mikrostrukturell design av hårdmetall för bergborrtillämpningar
Funder
Knowledge Foundation, 20160132
Available from: 2018-06-28 Created: 2018-06-28 Last updated: 2018-06-28Bibliographically approved
Habainy, J., Iyengar, S., Surreddi, K. B., Lee, Y. & Dai, Y. (2018). Formation of oxide layers on tungsten at low oxygen partial pressures. Paper presented at 13th International Workshop on Spallation Materials Technology (IWSMT), Chattanooga, USA, 2016. Journal of Nuclear Materials, 506(SI), 26-34
Open this publication in new window or tab >>Formation of oxide layers on tungsten at low oxygen partial pressures
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2018 (English)In: Journal of Nuclear Materials, ISSN 0022-3115, E-ISSN 1873-4820, Vol. 506, no SI, p. 26-34Article in journal (Refereed) Published
Abstract [en]

This work focuses on the oxidation of tungsten in inert gas atmospheres containing oxygen and moisture. It is particularly relevant for the European Spallation Source where the tungsten target is cooled by purified helium gas and the 5 MW proton beam can raise the maximum target temperature beyond the threshold for oxidation. Tungsten discs were oxidized isothermally at 400° to 900 °C for 2 h in pure helium and helium mixed with oxygen and water vapor, with varying partial pressures up to 500 Pa. Tungsten was oxidized even with a small amount of oxygen (≤5 ppm) present in industrially pure helium. Non-isothermal oxidation of tungsten foils was carried out in water vapor (∼100 Pa), in situ in an environmental scanning electron microscope. On specimens oxidized in inert gas containing water vapor (2 h, pH2O" role="presentation" style="box-sizing: border-box; margin: 0px; padding: 0px; display: inline-block; line-height: normal; font-size: 14.4px; word-spacing: normal; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; position: relative;">pH2O ∼790 Pa), Auger electron spectroscopy studies confirmed the presence of a thin oxide layer (40 nm) at 400 °C. At 500 °C the oxide layer was 10 times thicker. A dark, thin and adherent oxide layer was observed below 600 °C. Above this temperature, the growth rate increased substantially and the oxide layer was greenish, thick and porous. Oxide layers with varying stoichiometry were observed, ranging from WO3 at the surface to WO2 at the metal-oxide interface. For comparison, oxidation of tungsten alloysin He-5%O2 was studied. The implications of this work on the design and operation of the helium loop for cooling the target are discussed.

Keywords
Tungsten, Oxidation, Spallation target
National Category
Materials Engineering
Research subject
Steel Forming and Surface Engineering
Identifiers
urn:nbn:se:du-26922 (URN)10.1016/j.jnucmat.2017.12.018 (DOI)000432848200005 ()2-s2.0-85038857400 (Scopus ID)
Conference
13th International Workshop on Spallation Materials Technology (IWSMT), Chattanooga, USA, 2016
Available from: 2018-01-09 Created: 2018-01-09 Last updated: 2018-06-07Bibliographically approved
Vattur Sundaram, M., Surreddi, K. B., Hryha, E., Veiga, A., Berg, S., Castro, F. & Nyborg, L. (2018). Full Densification in PM Steels Through Liquid Phase Sintering and HIP Approach. In: Euro PM2018 Proceedings: . Paper presented at Euro PM2018 Bilbao, Spain, 2018-10-14 - 2018-10-18.
Open this publication in new window or tab >>Full Densification in PM Steels Through Liquid Phase Sintering and HIP Approach
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2018 (English)In: Euro PM2018 Proceedings, 2018Conference paper, Published paper (Refereed)
Abstract [en]

High-density powder metallurgy (PM) components are required for high-performance applications. Liquid phase sintering (LPS) is one such method to improve the densification, especially the master alloy route is preferred due to the flexibility in tailoring the alloying contents. In this study, gas atomised Ni-Mn-B master alloy powder of size fraction < 45 µm was admixed with water atomised iron and Mo-prealloyed powder. During sintering, there was a significant densification due to LPS where the liquid formation occurred in two stages, one from the master alloy melting and another from the eutectic liquid formation, enabling densities > 95%. The microstructural investigation revealed that the surface densification was achieved after sintering in H2 containing atmosphere. Capsule free hot isostatic pressing was performed on these samples to achieve full density. This approach of combining LPS and capsule free hot isostatic pressing demonstrates the potential in reaching full densification in high-performance PM steel components.

Keywords
liquid phase sintering, master alloy, PM steel, HIP, full density, surface densification
National Category
Metallurgy and Metallic Materials
Research subject
Steel Forming and Surface Engineering
Identifiers
urn:nbn:se:du-28801 (URN)
Conference
Euro PM2018 Bilbao, Spain, 2018-10-14 - 2018-10-18
Available from: 2018-10-19 Created: 2018-10-19 Last updated: 2018-10-22Bibliographically approved
Surreddi, K. B., Oikonomou, C., Karlsson, P., Olsson, M. & Pejryd, L. (2018). In-situ micro-tensile testing of additive manufactured maraging steels in the SEM: Influence of build orientation, thickness and roughness on the resulting mechanical properties. La Metallurgia Italiana (3), 27-33
Open this publication in new window or tab >>In-situ micro-tensile testing of additive manufactured maraging steels in the SEM: Influence of build orientation, thickness and roughness on the resulting mechanical properties
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2018 (English)In: La Metallurgia Italiana, ISSN 0026-0843, no 3, p. 27-33Article in journal (Refereed) Published
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.

Place, publisher, year, edition, pages
ASSOC ITALIANA METALLURGIA, 2018
Keywords
SELECTIVE LASER MELTING, IN-SITU MICRO-TENSILE TESTING, BUILD ORIENTATION, DEFORMATION MECHANISM AND MARAGING STEEL
National Category
Materials Engineering
Research subject
Steel Forming and Surface Engineering
Identifiers
urn:nbn:se:du-28114 (URN)000435488500005 ()
Available from: 2018-07-05 Created: 2018-07-05 Last updated: 2018-07-05Bibliographically approved
Wang, Z., Prashanth, K. G., Surreddi, K. B., Suryanarayana, C., Eckert, J. & Scudino, S. (2018). Pressure-assisted sintering of Al–Gd–Ni–Co amorphous alloy powders. Materialia, 2, 157-166
Open this publication in new window or tab >>Pressure-assisted sintering of Al–Gd–Ni–Co amorphous alloy powders
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2018 (English)In: Materialia, ISSN 2589-1529, Vol. 2, p. 157-166Article in journal (Refereed) Published
Keywords
Amorphous powders, Pressure, Sintering, Crystallization, Al diffusion
National Category
Metallurgy and Metallic Materials
Research subject
Steel Forming and Surface Engineering
Identifiers
urn:nbn:se:du-28802 (URN)10.1016/j.mtla.2018.07.010 (DOI)
Available from: 2018-10-19 Created: 2018-10-19 Last updated: 2018-10-22Bibliographically approved
Olsson, M. & Surreddi, K. B. (2018). Scratch testing of cemented carbides - Influence of Co binder phase and WC grain size on surface deformation and degradation mechanisms. In: Staffan Jacobson (Ed.), Proceedings of The 18th Nordic Symposium on Tribology - Nordtrib 2018: . Paper presented at 18th Nordic Symposium on Tribology - Nordtrib 2018. Uppsala: Uppsala University
Open this publication in new window or tab >>Scratch testing of cemented carbides - Influence of Co binder phase and WC grain size on surface deformation and degradation mechanisms
2018 (English)In: Proceedings of The 18th Nordic Symposium on Tribology - Nordtrib 2018 / [ed] Staffan Jacobson, Uppsala: Uppsala University, 2018Conference paper, Published paper (Refereed)
Abstract [en]

In the present study, the microstructural response of some commercial cemented carbide grades during scratchinghas been analyzed and evaluated by a number of post-test characterization techniques. The influence of Co binder phase content and WC grain size on the deformation and degradation on a WC grain size scale and on a composite scaleare evaluated. The results clearly illustrate the complexity of deformation, degradation and wear of cemented carbide and the dynamics of the diamond stylus / cemented carbide contact during the scratching event. For all cementedcarbide grades the microstructure has a strong impact on the observed degradation mechanisms and the resistance to deformation and degradation was found to increase with decreasing Co content and decreasing WC grain size.

Place, publisher, year, edition, pages
Uppsala: Uppsala University, 2018
Keywords
Scratch testing, Cemented carbide, Microstructure, Surface deformation, Wear
National Category
Materials Engineering
Research subject
Steel Forming and Surface Engineering
Identifiers
urn:nbn:se:du-28042 (URN)
Conference
18th Nordic Symposium on Tribology - Nordtrib 2018
Funder
Knowledge Foundation, 20150193
Available from: 2018-06-28 Created: 2018-06-28 Last updated: 2018-06-28Bibliographically approved
Olsson, M. & Surreddi, K. B. (2018). Thin hard CVD and PVD coatings and their potential in steel wire drawing applications. In: Staffan Jacobson (Ed.), Proceedings of The 18th Nordic Symposium on Tribology - NORDTRIB 2018: . Paper presented at The 18th Nordic Symposium on Tribology - NORDTRIB 2018, Uppsala, 18-21 June 2018. Uppsala: Uppsala University
Open this publication in new window or tab >>Thin hard CVD and PVD coatings and their potential in steel wire drawing applications
2018 (English)In: Proceedings of The 18th Nordic Symposium on Tribology - NORDTRIB 2018 / [ed] Staffan Jacobson, Uppsala: Uppsala University, 2018Conference paper, Published paper (Refereed)
Abstract [en]

In the present work, the potential of using thin hard CVD and PVD coatings in order to improve the performance of cemented carbide steel wire drawing nibs is evaluated. Coating materials include some state-of-the-art CVD and PVD coatings and pre- and post-coating treatments were used to improve the surface topography of the coated functional surfaces. The tribological performance of the coatings has been evaluated by sliding wear tests and wire drawing experiments under well controlled conditions. Post-test characterization of the coated nibs using 3D optical surface profilometry, scanning electron microscopy and energy dispersive X-ray spectroscopy illustrates the pros and cons of the two deposition techniques but also that the coatings have a potential to improve the performance of cemented carbide nibs in steel wire drawing applications.

Place, publisher, year, edition, pages
Uppsala: Uppsala University, 2018
Keywords
Wire drawing, Cemented carbide, CVD and PVD coatings, Friction, Wear
National Category
Materials Engineering
Research subject
Steel Forming and Surface Engineering
Identifiers
urn:nbn:se:du-28040 (URN)
Conference
The 18th Nordic Symposium on Tribology - NORDTRIB 2018, Uppsala, 18-21 June 2018
Funder
Knowledge Foundation, 20160132
Available from: 2018-06-28 Created: 2018-06-28 Last updated: 2018-06-28Bibliographically approved
Surreddi, K. B. & Olsson, M. (2018). Wear of cemented carbide nibs in steel wire drawing. In: Prof. Staffan Jacobson (Ed.), The 18th Nordic Symposium on Tribology – NORDTRIB 2018: . Paper presented at The 18th Nordic Symposium on Tribology – NORDTRIB 2018, 18-21 June 2018, Uppsala University, Uppsala, Sweden.
Open this publication in new window or tab >>Wear of cemented carbide nibs in steel wire drawing
2018 (English)In: The 18th Nordic Symposium on Tribology – NORDTRIB 2018 / [ed] Prof. Staffan Jacobson, 2018Conference paper, Oral presentation with published abstract (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.

Keywords
Wire drawing; Cemented carbide; Surface degradation; Wear mechanisms
National Category
Materials Engineering
Research subject
Steel Forming and Surface Engineering
Identifiers
urn:nbn:se:du-28027 (URN)
Conference
The 18th Nordic Symposium on Tribology – NORDTRIB 2018, 18-21 June 2018, Uppsala University, Uppsala, Sweden
Projects
Funktionell ytbehandling av tråddragningsverktyg för ökad prestanda och livslängd
Funder
Knowledge Foundation, 20160132
Available from: 2018-06-28 Created: 2018-06-28 Last updated: 2018-06-28Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-7938-9909

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