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High strength-ductility nano-structured high manganese steel produced by cryogenic asymmetry-rolling |
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| Authors: | Bin Fu Liming Fu Shichang Liu Huan Rong Wang Wei Wang Aidang Shan |
| Affiliation: | 1. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;2. School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai 201418, China;3. Shenyang Research Institute of Foundry, Shenyang 110022, China;4. Baosteel Research Institute, Shanghai 201900, China |
| Abstract: | 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. |
| Keywords: | Nano-structured TWIP steel Cryogenic deformation Asymmetric rolling (ASR) Nano-scale twins Work hardening ability |
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