High strength-ductility nano-structured high manganese steel produced by cryogenic asymmetry-rolling

Bin Fu^1,2，Liming Fu¹，Shichang Liu³，Huan Rong Wang⁴，Wei Wang⁴，Aidang Shan¹

1. School of Materials Science and Engineering, Shanghai Jiao Tong University2. School of Materials Science and Engineering, Shanghai Institute of Technology3. Shenyang Research Institute of Foundry4. Baosteel Research Institute

摘 要：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.

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