Effect of heat treatment process on microstructure and properties of 30MnCrNiMo high strength steel

doi:10.13251/j.issn.0254-6051.2020.01.009

Abstract

Abstract: The phase transition temperature Ac ₁ and Ac ₃ of 30MnCrNiMo steel was measured through full automatic transformation measuring apparatus,and the quenching and tempering processes and subcritical quenching and tempering processes of the steel were analyzed. The results show that the transformation temperature Ac ₁ is 653 ℃ and Ac ₃ is 807 ℃.The complex phase microstructure of martensite and ferrite which is obtained from the tested steel after suberitical quenching and tempering processes is more uniform and fine than the whole martensite obtained from the tested steel after direct quenching and tempering processes.The yield strength of the tested steel is 1499 MPa, the elongation is 14.0%, the impact absorbed energy at room temperature and -40 ℃ is 35.5 J and 29.9 J, respectively.The plasticity and impact toughness of the steel are significantly improved, which effectively improves the toughness performance of 30MnCrNiMo high-strength steel.

Key words: subcritical quenching process, 30MnCrNiMo high-strength steel, transformation temperature point, microstructure, properties

CLC Number:

TG142.1

Geng Wenyuan, Gao Ping, Wang Fan, Zhang Mingyi, Tian Yingchun. Effect of heat treatment process on microstructure and properties of 30MnCrNiMo high strength steel[J]. HTM, 2020, 45(1): 42-47.

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