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Effect of Molybdenum on the Microstructure and High-Temperature Tribological Properties of Laser Clad CoCrW Coating

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Abstract

The CoCrW coating modified with 11.0 wt% Mo was prepared by using laser cladding. Meanwhile, the effect of molybdenum on the microstructure and high-temperature tribological properties of coatings was systematically investigated. Tribological tests of coatings were conducted by using a ball-on-disk tribo-tester from 23 to 1000 °C against Si3N4 ball. The Mo showed a solid solution strengthening effect on the coating and promoted the formation of carbides. The phases of the CoCrW-11%Mo coating were composed of γ(fcc), Cr7C3, Cr23C6, Co6Mo6C and Co3Mo and the hardness of the coating was 1.3 times higher than that of CoCrW coating. The friction coefficients of the coatings decreased with the rise of temperature. The wear rates initially increased and then decreased with the increase in temperature. The Mo-modified coating had better tribological properties than the unmodified coating from room temperature to 1000 °C. The coatings showed different wear mechanisms at different temperatures.

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Acknowledgements

This study was supported by the Research Project Supported by the Shanxi Scholarship Council of China (Grant No. 2021-060) and the National Natural Science Foundation of China (Grant Nos. 51775365, U1910212).

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Authors and Affiliations

  1. College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan, 030024, People’s Republic of China

    Wenpeng Han, Gongjun Cui, Haotian Cui, Ziming Kou & Yanping Liu

  2. National-Local Joint Engineering Laboratory for Mine Fluid Control, Taiyuan, 030024, People’s Republic of China

    Wenpeng Han, Gongjun Cui, Haotian Cui, Ziming Kou & Yanping Liu

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  1. Wenpeng Han
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Correspondence to Gongjun Cui.

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Han, W., Cui, G., Cui, H. et al. Effect of Molybdenum on the Microstructure and High-Temperature Tribological Properties of Laser Clad CoCrW Coating. Trans Indian Inst Met 75, 3193–3202 (2022). https://doi.org/10.1007/s12666-022-02724-0

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