Effect of carburizing quenching and tempering process on microstructure and properties of G20CrNi2Mo steel

doi:10.13251/j.issn.0254-6051.2020.04.035

Abstract

Abstract: The variety of hardness and microstructure for G20CrNi2Mo steel after different heat treatment was analyzed by means of the optical microscopy (OM) and scanning electron microscope (SEM). And the wear resistance for the steel was studied by the friction abrasion testing machine. The results show that the hardness and wear resistance of G20CrNi2Mo steel are improved obviously after carburizing and quenching and tempering. The microstructure is fine martensite, grain carbide, and a small amount of residual austenite after double quenching. After the second quenching and tempering, the microstructure and properties of low temperature tempering at 200 ℃ are the best, and the microstructure is tempered martensite, with hardness value and wear loss of 62.3 HRC and 12.9 g, respectively.

Key words: G20CrNi2Mo steel, quenching, tempering, microstructure, hardness, wear resistance

CLC Number:

TG156

Fu Ming, Wang Zhiyong. Effect of carburizing quenching and tempering process on microstructure and properties of G20CrNi2Mo steel[J]. Heat Treatment of Metals, 2020, 45(4): 166-170.

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