A novel ultrafine-grained Fe-22Mn-0.6C TWIP steel with superior strength and ductility

作者：Tian, Y. Z.^*; Bai, Y.; Zhao, L. J.; Gao, S.; Yang, H. K.; Shibata, A.; Zhang, Z. F.; Tsuji, N.

来源：Materials Characterization, 2017, 126: 74-80.

DOI：10.1016/j.matchar.2016.12.026

• Twinning-induced plasticity (TWIP)
• steel
• Ultrafine grain (UFG)
• Twin
• Strength
• Ductility

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.

• 出版日期2017-4
• 单位中国科学院; 中国科学院金属研究所