Effect of annealing temperature on microstructure and properties of cold rolled 8Mn steel after low temperature hot stamping

doi:10.13251/j.issn.0254-6051.2022.11.004

Abstract

Abstract: Effect of annealing temperature on microstructure and properties of cold rolled 8Mn steel before and after low temperature hot stamping was studied by means of optical microscope, SEM, electronic tensile testing machine, EBSD and XRD analysis techniques. The results show that the austenite content decreases with the increase of annealing temperature before hot stamping. The microstructure of the annealed tested steel after stamping consists of martensite, ferrite and retained austenite. After hot stamping, the tensile strength of the tested steel annealed at different temperatures is about 1400 MPa, the yield strength is about 900 MPa, and the elongation is about 10%. It is concluded that the annealing temperature has little effect on mechanical properties of the 8Mn steel after low temperature hot stamping.

Key words: medium manganese steel, annealing, low temperature hot stamping, microstructure, mechanical properties

CLC Number:

TG142.1

Zhang Boming, Xu Dechao, Teng Huaxiang, Zhao Haifeng, Han Yun. Effect of annealing temperature on microstructure and properties of cold rolled 8Mn steel after low temperature hot stamping[J]. Heat Treatment of Metals, 2022, 47(11): 25-31.

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