Stacking fault energy and deformation mechanisms in Fe-xMn-0.6C-yAl TWIP steel
- Authors
- Kim, Jin Kyung; De, Cooman Bruno C.
- Issue Date
- Oct-2016
- Publisher
- Elsevier BV
- Keywords
- Deformation; Martensitic transformations; Mechanical property; Stacking-fault energy; Transmission electron microscopy (TEM); TWIP steel
- Citation
- Materials Science and Engineering: A, v.676, pp.216 - 231
- Indexed
- SCIE
SCOPUS
- Journal Title
- Materials Science and Engineering: A
- Volume
- 676
- Start Page
- 216
- End Page
- 231
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/15626
- DOI
- 10.1016/j.msea.2016.08.106
- ISSN
- 0921-5093
- Abstract
- The deformation mechanisms and mechanical properties of Fe-Mn-C-Al twinning-induced plasticity (TWIP) steels with a chemical composition range of 12–18 wt% Mn and 0–3 wt% Al, are reviewed. The in-depth microstructural analysis revealed that all the investigated TWIP steels exhibit deformation twinning as the main deformation mechanism in addition to dislocation glide. The Al-free TWIP steels have a much more complex deformation behavior than the Al-added TWIP steels. The deformation of Fe-15Mn-0.6C steel is accompanied by the formation of a very small amount of strain-induced ε martensite, in addition to deformation twinning. Deformation of Fe-12Mn-0.6C steel is accompanied by several deformation mechanisms which are simultaneously activated: strain-induced ε martensite, formation of shear bands and strain-induced α′ martensite, in addition to deformation twinning. The upper limit for the value of SFE for strain-induced martensitic transformation is determined to be approximately 13 mJ/m2. The results confirm that the SFE is the key parameters affecting the strength and the ductility of TWIP steel. A linear relation between the ultimate tensile strength (UTS) and the SFE is proposed, with the UTS increasing with decreasing SFE. © 2016 Elsevier B.V.
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