Effect of compound chemical heat treatment on microstructure and hardness of G13Cr4Mo4Ni4V steel

doi:10.13251/j.issn.0254-6051.2022.04.039

Abstract

Abstract: Effect of 140 h nitriding on the microstructure and hardness of carburized+quenched+tempered G13Cr4Mo4Ni4V steel was studied by using SEM, Rockwell hardness tester and Vickers microhardness tester. The results show that the depth of the effective carburized layer of G13Cr4Mo4Ni4V steel after carburizing+quenching+tempering is 1.45 mm, the highest hardness of the carburized layer is 785 HV, and the hardness of the core is 420 HV. The depth of the effective carburized and nitrided layer after nitriding treatment is reduced to 1.34 mm, the depth of nitrided layer is 0.22 mm, the highest hardness of the nitrided and nitrided layer can reach 948 HV, and the hardness of the core is 451 HV. Nitriding does not significantly improve the hardness of the core of the specimen. The surface Rockwell hardness of the G13Cr4Mo4Ni4V steel after carburizing+quenching+tempering and after nitriding treatment is similar, which is between 62 and 65 HRC, but the hardness of the specimen after nitriding treatment fluctuates relatively larger. The 140 h nitriding of carburized+quenched+tempered G13Cr4Mo4Ni4V steel achieves the goal of “hard surface and tough core”. The depth of the nitrided layer meets the engineering needs, but the network-like carbonization appears in the carburized and nitrided layer of the steel after nitriding treatment, so in the nitriding process, it is necessary to comprehensively consider the depth and microstructure of the nitriding layer to obtain good comprehensive mechanical properties.

Key words: aviation bearing steel, compound chemical heat treatment, hardness, carbides, G13Cr4Mo4Ni4V steel

CLC Number:

TG156

Su Yong, Wang Shuai, Wang Jixing, Yu Xingfu, Liu Hongxiu, Liu Jinling. Effect of compound chemical heat treatment on microstructure and hardness of G13Cr4Mo4Ni4V steel[J]. Heat Treatment of Metals, 2022, 47(4): 226-230.

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