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Stacking fault energy and deformation mechanisms in Fe-xMn-0.6C-yAl TWIP steel

Title
Stacking fault energy and deformation mechanisms in Fe-xMn-0.6C-yAl TWIP steel
Author
김진경
Keywords
TWIP steel; Transmission electron microscopy (TEM); Deformation; Mechanical property; Stacking-fault energy; Martensitic transformations
Issue Date
2016-10
Publisher
ELSEVIER SCIENCE SA
Citation
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, v. 676, Page. 216-231
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 epsilon 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 e martensite, formation of shear bands and strain-induced alpha' 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 my m(2). 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. (C) 2016 Elsevier B.V. All rights reserved.
URI
https://www.sciencedirect.com/science/article/pii/S0921509316310309https://repository.hanyang.ac.kr/handle/20.500.11754/100521
ISSN
0921-5093; 1873-4936
DOI
10.1016/j.msea.2016.08.106
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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