Heat treatment process and microstructure of a new SIMR tool steel

doi:10.13251/j.issn.0254-6051.2021.08.029

Abstract

Abstract: The heat treatment process and microstructure of the SIMR, a high carbon and high chromium martensitic tool steel, were systematically studied by different quenching and tempering processes. Microstructure, morphologies and distribution of carbides and micro-hardness of the SIMR tool steel were researched by means of XRD, SEM, and TEM characterization methods, and the optimum heat treatment of the SIMR tool steel was obtained. The tested results show that the grain size of the SIMR tool steel gradually grows with the increase of quenching temperature, and the chromium-rich M₇C₃ type primary carbide which forms during the smelting solidification process, gradually re-dissolves with the increase of quenching temperature, and the micro-hardness increases first and then decreases. When the tempering temperature is between 150 ℃ and 300 ℃, the optimum heat treatment process for the SIMR tool steel is quenching at 1050 ℃ for 20 min, and then oil quenching, finally tempering at 150 ℃ for 90 min and then air cooling.

Key words: SIMR tool steel, heat treatment process, microstructure, hardness

CLC Number:

TG156

Duan Wenfeng, Shi Quanqiang, Li Jihui, He Ling, Fan Yihao, Shao Pin, Yan Wei. Heat treatment process and microstructure of a new SIMR tool steel[J]. Heat Treatment of Metals, 2021, 46(8): 156-163.

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