Effect of heat treatment on microstructure and properties of 4Cr5MoSiV1 steel for needle valve body

doi:10.13251/j.issn.0254-6051.2022.07.021

Abstract

Abstract: Quenching+low temperatural tempering and quenching+medium temperature tempering were applied to the 4Cr5MoSiV1 steel, and the effect of the two typical heat treatment processes on microstructure, Vickers hardness and mechanical properties was analyzed. The results show that with the increase of tempering temperature, the microstructure of the needle valve body changes from tempered martensite to tempered troosite. Meanwhile, the Vickers hardness decreases from 639.4 HV0.1 to 584.4 HV0.1, while the tensile strength, yield strength and elongation increase by 12.7%, 12.8% and 26.6%, respectively.

Key words: steel for needle valve body, 4Cr5MoSiV1 steel, heat treatment, microstructure, mechanical properties

CLC Number:

TG162

Han Jungang, Shao Zhiwen, Song Yunkun, Chen Xiaohu, Ding Boyuan, Gu Jiaojiao. Effect of heat treatment on microstructure and properties of 4Cr5MoSiV1 steel for needle valve body[J]. Heat Treatment of Metals, 2022, 47(7): 120-124.

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