Effect of dual liquid quenching on microstructure and hardness of 9Cr2Mo steel roller

doi:10.13251/j.issn.0254-6051.2022.03.017

Abstract

Abstract: Effect of water-oil dual liquid quenching process on microstructure and hardness of 9Cr2Mo roller were researched, and the optimum cooling process of dual liquid quenching was obtained. The results show that after single liquid quenching, the surface microstructure of the roller is coarse tempered martensite, while after water-oil dual liquid quenching, the tempered martensite is obviously refined, a small amount of bainite and retained austenite are formed, and the service life of the roller is significantly improved due to proper surface hardness distribution of the roller, which is high in the middle and low in the edge. The optimum cooling process of water-oil dual liquid quenching for 9Cr2Mo steel roller of ø750 mm is as follows: the precooling time outside the furnace before water cooling is 300 s, and the interval precooling time between water cooling and oil cooling in dual liquid quenching is controlled at 60-180 s.

Key words: 9Cr2Mo steel roller, dual liquid quenching process, hardness, microstructure

CLC Number:

TG442.1

Sun Guojin, Gao Zhiwen, Cui Xiaoyan, Gao Kekun, Sun Li. Effect of dual liquid quenching on microstructure and hardness of 9Cr2Mo steel roller[J]. Heat Treatment of Metals, 2022, 47(3): 88-91.

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