Microstructure and properties of carburized layer of 20Cr2Ni4A steel and 17Cr2Ni2MoVNb steel

doi:10.13251/j.issn.0254-6051.2022.05.027

Abstract

Abstract: Microstructure and properties of the carburized layers of 20Cr2Ni4A steel and 17Cr2Ni2MoVNb steel under the same heat treatment process were investigated. The results show that the grains of 17Cr2Ni2MoVNb steel before and after heat treatment are finer than that of the 20Cr2Ni4A steel. After quenching and low temperature tempering, the core grain size grade of the 20Cr2Ni4A steel is grade 7, and that of the 17Cr2Ni2MoVNb steel is grade 8. The grain size of the carburized layer changes gradually, and that of the outermost layer in the carburized layer is the biggest but still is the same as the core grain size due to the pinning effect of the carbide formed by trace elements such as V and Nb on the grain boundary. At the same time, more content of the carbide particles make the microhardness of the 17Cr2Ni2MoVNb steel slightly higher than that of the 20Cr2Ni4A steel. The carburized layer of 17Cr2Ni2MoVNb steel has higher hardness and more carbides than that of 20Cr2Ni4A steel, so its wear resistance is better.

Key words: 20Cr2Ni4A steel, 17Cr2Ni2MoVNb steel, carburized layer, grain size, carbides, wear resistance

CLC Number:

TG142.1

Zhu Xu, Chen Jianwen, Jiang Yizhou, Liu Ke, Luo Zixiang, Gao Yiqiang, Xiang Zhendong. Microstructure and properties of carburized layer of 20Cr2Ni4A steel and 17Cr2Ni2MoVNb steel[J]. Heat Treatment of Metals, 2022, 47(5): 166-170.

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