Journal
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
Volume 34, Issue 4, Pages 695-699Publisher
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2017.09.017
Keywords
Nano-structured TWIP steel; Cryogenic deformation; Asymmetric rolling (ASR); Nano-scale twins; Work hardening ability
Funding
- Jiangxi Provincial Science and Technology Department [20151BDH80082]
- China National Major Science and Technology Project [2014ZX07214-002]
- China Postdoctoral Science Foundation [2015M581608]
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A bulk nanostructured twinning-induced plasticity (TWIP) steel with high ductility and high strength was fabricated by cryogenic asymmetry-rolling (cryo-ASR) and subsequent recovery treatment. It was found that the cryo-ASRed TWIP steels exhibit simultaneous improvements in the ductility, strength and work hardening. Typical microstructures of the cryo-ASR TWIP steel were characterized by shear bands and intensive mechanical nano-sized twins induced by cryogenic deformation. These mechanical nano-scale twins remain thermally stable during the subsequent recovery treatment. It is believed that the ductility enhancement and high work-hardening ability for the cryo-ASR TWIP steels should be mainly attributed to the high-density pre-existing nano-scale twins. (C) 2017 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
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