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

doi:10.1016/j.jmst.2017.09.017

J. Mater. Sci. Technol. ›› 2018, Vol. 34 ›› Issue (4): 695-699.DOI: 10.1016/j.jmst.2017.09.017

Special Issue: Nanomaterials 2018； Stainless Steel & High Strength Steel 2018

• Orginal Article • Previous Articles Next Articles

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

rollingBin Fu^a^b, Liming Fu^a^*(), Shichang Liu^c, Huan Rong Wang^d, Wei Wang^d, Aidang Shan^a^*()

^aSchool of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
^bSchool of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai 201418, China
^cShenyang Research Institute of Foundry, Shenyang 110022, China
^dBaosteel Research Institute, Shanghai 201900, China

Received:2015-04-18 Revised:2017-05-09 Online:2018-04-20 Published:2018-05-04
Contact: Fu Liming,Shan Aidang

Abstract

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.

Key words: Nano-structured TWIP steel, Cryogenic deformation, Asymmetric rolling (ASR), Nano-scale twins, Work hardening ability

rollingBin Fu, Liming Fu, Shichang Liu, Huan Rong Wang, Wei Wang, Aidang Shan. High strength-ductility nano-structured high manganese steel produced by cryogenic asymmetry-rolling[J]. J. Mater. Sci. Technol., 2018, 34(4): 695-699.

Figures/Tables 4

Fig 1. Optical micrographs of the high-Mn steel: (a) hot-rolled and 950 °C annealing, (b) ASR, (c) cryo-ASR.

Fig. 2. Tensile behavior of the ASRed and cryo-ASRed high manganese steels: (a) engineering strain-stress curves; (b) true strain-stress curves; (c) the corresponding strain hardening rate.

Fig. 3. Comparison of the XRD patterns of the ASRed and cryo-ASRed high-Mn steel before and after tension.

Fig. 4. Typical TEM morphologies of the high-Mn steel: (a) normal ASR and recovery at 400 °C; (b) cryo-ASR; (c) dark-field image of the formed nano-twins(NT) showed in (b); (d) cryo-ASR and recovery at 400 °C. The inset in (c) shows the corresponding diffraction pattern with [110]FCC zone axis.

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

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