Heat treatment process optimization and mechanical properties of 42CrMoVNb steel

doi:10.13251/j.issn.0254-6051.2023.04.026

Abstract

Abstract: Heat treatment process of 42CrMoVNb steel was optimized by single factor and orthogonal tests. The mechanical properties of the 42CrMoVNb steel were tested by Rockwell hardness tester, universal tensile testing machine and metal pendulum impact testing machine. The effect of heat treatment process on microstructure and mechanical properties of the 42CrMoVNb steel was studied. The results show that the optimal heat treatment process of the 42CrMoVNb steel is quenching at 860 ℃ for 20 min, oil cooling and tempering at 440 ℃ for 150 min, air cooling. The microstructure under the optimal heat treatment process is tempered troostite matrix dispersed with fine carbide particles, the hardness, tensile strength, yield strength, yield ratio, elongation after fracture, percentage reduction of area and impact absorbed energy at -20 ℃ are 44.5 HRC, 1467 MPa, 1357 MPa, 0.93, 10.5%, 46% and 27.1 J, respectively, which all meet the mechanical properties requirements of 14.9 grade high strength bolts.

Key words: heat treatment, 42CrMoVNb steel, tensile strength, yield strength, impact property

CLC Number:

TG142.1

Han Guisheng, Zhang Xueming, Li Haitao, Fan Shuaiqi, Dai Jiaoyan, Xu Jinfu. Heat treatment process optimization and mechanical properties of 42CrMoVNb steel[J]. Heat Treatment of Metals, 2023, 48(4): 161-165.

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