Effect of tempering temperature on microstructure and properties of 22MnB5 steel for automobile

doi:10.13251/j.issn.0254-6051.2020.07.007

Abstract

Abstract: Microstructure and properties of 22MnB5 steel for automobile after tempering at 150-300 ℃ were studied by means of optical microscope, SEM, TEM and universal testing machine. The results show that after quenching and tempering, the structure of 22MnB5 steel is mainly tempered martensite, and obvious second phase precipitation is observed under transmission electron microscope, which has good plastic deformation resistance. With the increase of tempering temperature, supersaturated α phase recovers and precipitates carbides, and the mechanical properties gradually decrease. In the tested temperature range, the mechanical properties of the 22MnB5 steel reach the best at 150 ℃, and the tensile strength and hardness are 1583 MPa and 48 HRC respectively.

Key words: steel for automobile, CCT curves, martensite structure, tensile strength, dislocation, second phase

CLC Number:

TG156.5

Wang Simin, Hu Zhihua, Wang Zhengyun, Luan Daocheng, Wang Nan, Chen Jie. Effect of tempering temperature on microstructure and properties of 22MnB5 steel for automobile[J]. Heat Treatment of Metals, 2020, 45(7): 32-36.

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