Effect of Mo content on microstructure and wear resistance of high carbon steel

doi:10.13251/j.issn.0254-6051.2024.09.011

Abstract

Abstract: Based on JMatpro software, the variation curves of microstructure and phase content with temperature and the CCT curves of high carbon steels (0.95%C) with different Mo contents were calculated and analyzed, and the heat treatment process was determined. The effect of Mo content on the microstructure and wear resistance of the tested steels was studied by means of metallographic microscope, scanning electron microscope and dry sand wear machine. The results show that the heat treatment process of the Mo-bearing high carbon steel based on the JMatpro calculation and analysis is holding at 770 ℃ for 1 h followed by water quenching, and then tempering at 200 ℃ for 2 h followed by furnace cooling. The microstructure of the steel treated by this process is mainly cryptocrystalline martensite, twin martensite and carbide particles. The addition of Mo element improves the hardness and wear resistance of the steel. When the Mo content is 3%, the hardness and wear resistance of the steel are the best, which are 16% and 30.84% higher than that of non-Mo high carbon steel, respectively. When the Mo content is greater than 3%, more carbides that are difficult to decompose will precipitate on the grain boundary of the steel and accumulate seriously, resulting in uneven hardness. These carbides fall off during the wear test to form pits, thus reducing the wear resistance of the steel.

Key words: Mo, high carbon steel, microstructure, wear resistance, hardness, carbide

CLC Number:

TG142

Sun Taoan, Wu Zhengyi, Zhou Jishun, Xiao Bingzheng, Wang Haichuan, Fan Dingdong, Deng Aijun. Effect of Mo content on microstructure and wear resistance of high carbon steel[J]. Heat Treatment of Metals, 2024, 49(9): 64-71.

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