Formation mechanism of dispersed carbide in carburized case of 20MnCr5 gear steel

doi:10.13251/j.issn.0254-6051.2022.12.033

Abstract

Abstract: 20MnCr5 gear steel was carburized and quenched by the newly developed diffusion carburizing process, and the microstructure of precipitates was studied by means of metallographic microscope. The results show that within a certain depth range of the carburized case, two kinds of carbide with different dispersion distribution are precipitated, which is mainly large particles with a size of 1-5 μm at the grain boundary, while at the intragranular the carbide is mainly small in size, which is less than 1 μm in size and accounts for more than 80%. The precipitation mechanism of two different types of carbides is also revealed.

Key words: carburizing heat treatment, dispersed carbides, size distribution, precipitation mechanism

CLC Number:

TG156

Li Yang, Hou Shengwen, He Erkang, Zhang Xiaotian. Formation mechanism of dispersed carbide in carburized case of 20MnCr5 gear steel[J]. Heat Treatment of Metals, 2022, 47(12): 196-200.

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