Effect of Ni content on microstructure and mechanical properties of quenched and tempered 40CrNiMo steel

doi:10.13251/j.issn.0254-6051.2022.09.042

Abstract

Abstract: Effect of Ni content on microstructure, volume fraction of retained austenite, hardness, tensile strength and impact property at room temperature of quenched and tempered 40CrNiMo steel was studied by means of OES, SEM, XRD and mechanical testing instruments. The results show that with the increase of Ni content from 1.346% to 1.618%, the microstructure and content of retained austenite have no obviously change, while the lattice distortion of α-Fe increases. The hardness of the tested steel tempered at different temperatures increases by 5-10 HV. The tensile strength of the high Ni content steel tempered at 450 ℃ is 78 MPa higher than that of the low Ni content steel, meanwhile the increase of tensile strength decreases with the increase of tempering temperature. However, under the condition that the retained austenite content is almost unchanged, the increase of Ni content reduces the impact absorbed energy of the steel tempered at 450 ℃ and 500 ℃ by about 50%.

Key words: Ni content, 40CrNiMo steel, quenched and tempered, microstructure, mechanical properties

CLC Number:

TG113

Guan Yunqi, Li Liang, Hu Wenxiang, Shi Zhengliang, Xu Jia. Effect of Ni content on microstructure and mechanical properties of quenched and tempered 40CrNiMo steel[J]. Heat Treatment of Metals, 2022, 47(9): 245-249.

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