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Effect of temperature on the stacking fault energy and deformation behaviour in 316L austenitic stainless steel
Dalarna University, School of Technology and Business Studies, Materials Technology. KTH.ORCID iD: 0000-0002-7355-1941
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2019 (English)In: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 759, p. 490-497Article in journal (Refereed) Published
Abstract [en]

The stacking fault energy (SFE) is often used as a key parameter to predict and describe the mechanical behaviour of face centered cubic material. The SFE determines the width of the partial dislocation ribbon, and shows strong correlation with the leading plastic deformation modes. Based on the SFE, one can estimate the critical twinning stress of the system as well. The SFE mainly depends on the composition of the system, but temperature can also play an important role. In this work, using first principles calculations, electron backscatter diffraction and tensile tests, we show a correlation between the temperature dependent critical twinning stress and the developing microstructure in a typical austenitic stainless steel (316L) during plastic deformation. We also show that the deformation twins contribute to the strain hardening rate and gradually disappear with increasing temperature. We conclude that, for a given grain size there is a critical temperature above which the critical twinning stress cannot be reached by normal tensile deformation, and the disappearance of the deformation twinning leads to lower strain hardening rate and decreased ductility.

Place, publisher, year, edition, pages
2019. Vol. 759, p. 490-497
Keywords [en]
Deformation twinning, microstructure, first principles, stacking fault energy, stainless steel
National Category
Metallurgy and Metallic Materials
Research subject
Steel Forming and Surface Engineering
Identifiers
URN: urn:nbn:se:du-30092DOI: 10.1016/j.msea.2019.05.079ISI: 000472813900052Scopus ID: 2-s2.0-85066090205OAI: oai:DiVA.org:du-30092DiVA, id: diva2:1317639
Funder
Vinnova, 2014-03374Available from: 2019-05-23 Created: 2019-05-23 Last updated: 2019-07-22Bibliographically approved

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Publisher's full textScopushttps://www.sciencedirect.com/science/article/abs/pii/S0921509319307117

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Molnar, DavidEngberg, Göran

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CiteExportLink to record
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  • apa
  • ieee
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  • vancouver
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  • de-DE
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