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Effect of temperature on the stacking fault energy and deformation behaviour in 316L austenitic stainless steel
Royal Inst Technol, Dept Mat Sci & Engn, Appl Mat Phys, SE-10044 Stockholm, Sweden;Dalarna Univ, Mat Sci Grp, SE-79188 Falun, Sweden.
Royal Inst Technol, Dept Mat Sci & Engn, Appl Mat Phys, SE-10044 Stockholm, Sweden;Xi An Jiao Tong Univ, State Key Lab Mech Behav Mat, Frontier Inst Sci & Technol, Ctr Microstruct Sci, Xian 710049, Shaanxi, Peoples R China.
Royal Inst Technol, Dept Mat Sci & Engn, Appl Mat Phys, SE-10044 Stockholm, Sweden.
Royal Inst Technol, Dept Mat Sci & Engn, Appl Mat Phys, SE-10044 Stockholm, Sweden.
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2019 (Engelska)Ingår i: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 759, s. 490-497Artikel i tidskrift (Refereegranskat) 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.

Ort, förlag, år, upplaga, sidor
ELSEVIER SCIENCE SA , 2019. Vol. 759, s. 490-497
Nyckelord [en]
Deformation twinning, Microstructure, First principles, Stacking fault energy, Stainless steel
Nationell ämneskategori
Metallurgi och metalliska material
Identifikatorer
URN: urn:nbn:se:uu:diva-390825DOI: 10.1016/j.msea.2019.05.079ISI: 000472813900052OAI: oai:DiVA.org:uu-390825DiVA, id: diva2:1342893
Forskningsfinansiär
VetenskapsrådetStiftelsen för strategisk forskning (SSF)EnergimyndighetenVinnova, 2014-03374Tillgänglig från: 2019-08-14 Skapad: 2019-08-14 Senast uppdaterad: 2019-08-14Bibliografiskt granskad

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