Influence of austenite reverse transformation annealing temperature on microstructure and properties of Cu-containing medium manganese steel

doi:10.13251/j.issn.0254-6051.2025.02.015

Abstract

Abstract: Influence of austenite reverse transformation annealing temperature on microstructure evolution, mechanical properties and deformation behavior of 0.30C-5.21Mn-0.34Cu medium manganese steel was studied by means of SEM, EBSD, XRD and TEM. The results show that the microstructure of the steel after annealing is mainly composed of ferrite, retained austenite and martensite. As the annealing temperature increases, the content of retained austenite first increases and then sharply decreases, reaching a maximum of 20.38% at 700 ℃. As the annealing temperature increases, the tensile strength and yield strength of the tested steel show opposite changes. While the elongation and product of strength and elongation first increase and then decrease, which is basically consistent with the variation law of retained austenite volume fraction. When annealed at 700 ℃ for 60 min, the comprehensive mechanical properties of the tested steel are the best, with tensile strength, elongation, and product of strength and elongation reaching 1004 MPa, 54.80%, and 55.02 GPa·%, respectively.

Key words: medium manganese steel containing copper, austenite reverse transformation annealing, microstructure evolution, retained austenite, work hardening

CLC Number:

TG441.8

Zhang Shenghao, Wang Bao, Li Sijia, Xiao Meimei, Zhou Jian'an. Influence of austenite reverse transformation annealing temperature on microstructure and properties of Cu-containing medium manganese steel[J]. Heat Treatment of Metals, 2025, 50(2): 96-101.

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