Effects of rolling method and heat treatment process on microstructure and properties of medium-Mn steel

doi:10.13251/j.issn.0254-6051.2023.08.017

Abstract

Abstract: Medium-Mn steel Fe-0.11C-5.23Mn-1.11Al-0.10Si was heat treated with different processes (austenite reverse transformation(ART) and quenching and tempering(Q&T)) after different rolling methods (hot rolling(HR), warm rolling(WR) and cold rolling(CR)). The effects of different rolling and heat treatment processes on microstructure and properties of the steel were investigated. The results show that the microstructure of the steel treated by HR+WR+ART is mainly composed of lath austenite and ferrite, with a small amount of equiaxed massive austenite. The grain size of the steel treated by HR+WR+ART is significantly reduced, with a high volume fraction of retained austenite, which can generate a wider TRIP effect. After treated by HR+WR+ART and HR+WR+Q&T, the steel shows good comprehensive properties, but the former is superior, with the tensile strength of 1001 MPa, yield strength of 745.7 MPa, elongation after fracture of 49.2% and the product of strength and elongation of 49.25 GPa·%.

Key words: medium-Mn steel, rolling method, heat treatment, retained austenite, mechanical properties

CLC Number:

TG156

Peng Longsheng, Liu Chunquan, Xiong Fen, Zhang Ying, Huang Wei, Lin Yinghua. Effects of rolling method and heat treatment process on microstructure and properties of medium-Mn steel[J]. Heat Treatment of Metals, 2023, 48(8): 106-112.

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