Effect of tempering process on microstructure and properties of 1Cr12Ni3MoVN steel

doi:10.13251/j.issn.0254-6051.2020.03.038

Abstract

Abstract:

Microstructure and mechanical properties of 1Cr12Ni3MoVN steel were studied by means of microstructure analysis, tensile test at room temperature, impact test and hardness test. The results show that with the increase of tempering temperature, the precipitates of 1Cr12Ni3MoVN steel increase, which has a strengthening effect on strength and impact properties of the material. As the carbides aggregate and grow up, the microstructure of matrix tends to change from martensite to tempered sorbite; the segregation of impurity elements at the grain boundary reduces the fracture resistance of the material, the impact toughness decreases, and therefore the tempering temperature should be lower. With the extension of the tempering time at 565 ℃, the tensile strength, yield strength and hardness of 1Cr12Ni3MoVN steel decrease, the plasticity changes little, the impact absorbed energy increases slightly, so the tempering holding time should not be too long. With the decrease of tempering cooling speed, the strength of 1Cr12Ni3MoVN steel increases first and then decreases, the plasticity changes little, the impact absorbed energy decreases significantly, and the hardness changes little, so it is recommended to use air cooling for tempering cooling. The optimal heat treatment process of tempering is 565 ℃ for 2 h, air cooling.

Key words: 1Cr12Ni3MoVN steel, tempering process, microstructure and properties

CLC Number:

TG141

Yan Lei, Li Xuming, Li Kaifeng, Ma Fengchun. Effect of tempering process on microstructure and properties of 1Cr12Ni3MoVN steel[J]. HTM, 2020, 45(3): 196-199.

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