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Effect of preliminary nitriding treatment on microstructure and mechanical properties of carburized layer of Cr-Co-Mo-Ni bearing steel |
SONG Chao-wei, TIAN Yong, WANG Hao-jie, WANG Zhao-dong |
State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, Liaoning, China |
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Abstract The process of chemical heat treatment has an important influence on the service performance of bearing steel. Microstructure and mechanical properties of carburized layer of a novel Cr-Co-Mo-Ni bearing steel after preliminary nitriding treatment were investigated. The results show that after preliminary nitriding treatment, the carburized layer can be differentiated as mixed region of precipitates and acicular martensite, mixed region of acicular martensite, lath martensite and precipitates, as well as mixed region of precipitates and lath martensite. A large number of tiny pores were found at the position which was original white light layer formed by nitriding. Less Cr carbides precipitated at the surface layer of the sample during the whole process of preliminary nitriding treatment. With the increase of the depth of the carburized layer, more Cr carbides with largr size precipitated at the subsurface layer. Compared with samples carburizing only, the size of precipitates after tempering was smaller in the preliminary nitriding treatment samples at the same surface position. The preliminary nitriding treatment can improve carburizing efficiency and increase the hardness of carburized layer. The hardness of the preliminary nitriding treatment sample is higher than that with carburizing only from 0.12 to 0.82 mm at carburized layer. The improvement of hardness of heat treatment after carburizing is also significantly higher than that with carburizing only.
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Received: 27 May 2020
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