Effect of heat treatment process on microstructure and properties of 4Cr3Mo2Si1V steel

doi:10.13251/j.issn.0254-6051.2022.01.037

Abstract

Abstract: Continuous cooling transformation (CCT) diagram of hot work die steel 4Cr3Mo2Si1V was measured by thermal dilatometry. Mechanical properties and microstructure of the steel under different quenching and tempering processes were studied. The results show that the critical cooling rates of pearlite and bainite of the steel are 0.03 ℃·s^-1 and 0.8 ℃·s^-1, respectively. Through quenching test, it is found that the steel has high hardness after oil quenching at 1030 ℃ and 1060 ℃, and the grain size does not grow obviously. The hardness of the steel increases firstly and then decreases with the increase of tempering temperature, reaching peak value of about 57 HRC at 500 ℃ due to a high volume fraction and density of second phase particles precipitate which enhances the precipitation strengthening effect and results in the secondary hardening phenomenon. After quenching at 1030 ℃ and tempering at 600 ℃, the average impact absorbed energy of the steel reaches the maximum value of 265 J, as well as the hardness remains 52 HRC. By evaluating the combination of strength and toughness, the optimal heat treatment process of the 4Cr3Mo2Si1V steel is quenching at 1030 ℃ for 30 min with oil cooling and then tempering twice at 600 ℃ for 2 h with air cooling.

Key words: hot work die steel, alloying, CCT curve, heat treatment, mechanical properties

CLC Number:

TG142.1

Cai Zhuwen, Li Ling, Shen Yutao, Wu Xiaochun. Effect of heat treatment process on microstructure and properties of 4Cr3Mo2Si1V steel[J]. Heat Treatment of Metals, 2022, 47(1): 226-232.

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