Journal
MATERIALS CHARACTERIZATION
Volume 126, Issue -, Pages 74-80Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2016.12.026
Keywords
Twinning-induced plasticity (TWIP); steel; Ultrafine grain (UFG); Twin; Strength; Ductility
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Funding
- Japan Society for Promotion of Science (JSPS)
- National Natural Science Foundation of China (NSFC) [51331007, 51501198]
- Elements Strategy Initiative for Structural Materials (ESISM) through the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan
- Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan [2201]
- Grants-in-Aid for Scientific Research [15H05767] Funding Source: KAKEN
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A fully recrystallized ultrafine-grained (UFG) Fe-22wt.%Mn-0.6wt.%C twinning-induced plasticity (TWIP) steel with mean grain size of 576 nm was fabricated by cold rolling and annealing process. Tensile test showed that this UFG steel possessed high yield strength of 785 MPa, and unprecedented uniform elongation of 48%. The Hall-Petch relationship was verified from the coarse-grained (CG) regime to the ultrafine-grained (UFG) regime. The microstructures at specified tensile strains were characterized by electron backscattered diffraction (EBSD) and transmission electron microscopy (TEM). The microstructures and strain hardening behavior of the UFG TWIP steel were compared with the CG counterpart. The strong strain hardening capability of the UFG steel is supposed to be responsible for the high strength and good ductility. (C) 2017 Elsevier Inc All rights reserved.
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