Heat treatment process and mechanical properties of low alloy wear-resistant steel

doi:10.13251/j.issn.0254-6051.2023.09.037

Abstract

Abstract: CCT curves of a low alloy wear-resistant steel were measured by using a DIL805 quenching dilatometer to study its phase transformation law during continuous cooling. The microstructure of the specimens at different cooling rates was observed by using OM. In addition, the low alloy wear-resistant steel was heat treated by using quenching+tempering process, quenching+cryogenic treatment+tempering process, and the specimens were analyzed by using SEM characterization, tensile and impact tests to study the effect of cryogenic treatment on the microstructure and properties of the tested steel. The results show that the critical cooling rate of martensite transformation of the tested steel is 5 ℃/s. The tensile strength and yield strength of the low alloy wear-resistant steel are increased by 136.5 MPa and 141.5 MPa, respectively, with the addition of cryogenic treatment. The impact property is decreased slightly while the plasticity remains unchanged after cryogenic treatment. The main mechanism of improvement of the strength and plasticity of low alloy wear-resistant steel caused by cryogenic treatment is to promote the refinement of martensitic lath.

Key words: low alloy wear-resistant steel, heat treatment, cryogenic treatment, microstructure, mechanical properties

CLC Number:

TG156.91

Zhang Zhichun, Wen Jia, Chen Guorui, Wu Guanghui, Weng Zeju, Gu Kaixuan. Heat treatment process and mechanical properties of low alloy wear-resistant steel[J]. Heat Treatment of Metals, 2023, 48(9): 220-224.

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