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Carbides precipitation and their evolution of Cr15Co10Mo5-alloyed heat-resistant bearing steel after tempering at different temperatures

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Abstract

The carbides precipitation and their evolution at elevated tempering temperature in Cr15Co10Mo5-alloyed heat-resistant bearing steel were investigated by means of the transmission electron microscope. The results show that there is no carbide precipitated from the martensitic matrix when the sample was tempered at 480 °C. However, when the sample was tempered at 540 °C, a large number of stable spherical M6C carbides precipitated in the test steel. Nevertheless, there are three types of carbides precipitated from the matrix including M6C, M2C and M23C6 carbides when the tempering temperature reached 600 °C. The mechanical properties also present a correlation with the evolution of carbides during tempering at different temperatures. This indicates that the strengthening mechanism of the steel is mainly attributed to the precipitation of carbides and their evolution, including the morphologies and types of carbides at different temperatures. In addition, the austenitic layers with a thickness of about 30 nm have been obtained between the martensite laths after tempering at 600 °C. The austenitic layers will produce transformation-induced plasticity effects to improve the toughness of the steel.

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Acknowledgements

The work was financially supported by National Natural Science Foundation of China (Grant No. 51761022) and Fund for Testing and Analyzing of Kunming University of Science and Technology (Grant Nos. 2016T20110167 and 2017M20162130021).

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Authors and Affiliations

  1. School of Material Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, Yunnan, China

    Mao-guo Xiao, Xin-yang Lü, Dong-hui Li, Shao-hong Li & Kun-yu Zhao

  2. Institute for Special Steels, Central Iron and Steel Research Institute, Beijing, 100081, China

    Mao-sheng Yang

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  1. Mao-guo Xiao
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  2. Xin-yang Lü
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  3. Dong-hui Li
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  4. Shao-hong Li
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Correspondence to Shao-hong Li.

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Xiao, Mg., Lü, Xy., Li, Dh. et al. Carbides precipitation and their evolution of Cr15Co10Mo5-alloyed heat-resistant bearing steel after tempering at different temperatures. J. Iron Steel Res. Int. 26, 1096–1105 (2019). https://doi.org/10.1007/s42243-019-00286-y

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  • DOI: https://doi.org/10.1007/s42243-019-00286-y

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