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Microstructure and wear-resistant properties of NiCr–Cr3C2 coating with Ni45 transition layer produced by laser cladding

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Abstract

NiCr–Cr3C2 metal–ceramic composite coating is commonly produced on metal substrate by laser cladding to be used as wear-resistant coating under medium- or high-temperature working conditions. The coating has high hardness, generally over three times that of the substrate. In order to make the hardness increase gradually from substrate to coating surface, the nickel-based alloy Ni45 was chosen as the transition layer and NiCr–Cr3C2 coating was indirectly cladded on 20Cr2Ni4A substrate. Microstructure and composition of the coating were characterized by scanning electron microscope (SEM), energy-dispersive spectroscopy (EDS) and X-ray diffraction (XRD). Microhardness of the cross section of the coating was measured. Friction and wear behavior of NiCr–Cr3C2 coating and substrate were investigated through sliding against the SiC ball at 20, 100 and 300 °C. The morphologies of worn surfaces were analyzed by SEM and EDS. The results show that the hardness of Ni45 transition layer is between that of the substrate and NiCr–Cr3C2 coating, which avoids hardness jump and stress concentration of the coating. NiCr–Cr3C2 coating contains hard phases of Cr3C2 and Cr7C3 which enhance the wear resistance. With the temperature increasing, friction coefficient and wear rate of the substrate increase significantly. Compared with the substrate, NiCr–Cr3C2 coating has lower friction coefficient and wear rate at 100 and 300 °C, which verifies the good wear resistance of NiCr–Cr3C2 coating.

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Acknowledgments

This study was financially supported by the National Natural Science Foundation of China (No. 51275020) and the National Defense Pre-Research Foundation of China (No. 9140A18020212HK01210).

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Authors and Affiliations

  1. School of Mechanical Engineering and Automation, Beihang University, Beijing, 100191, China

    Chun-Cheng Zang, Yan-Zhong Wang & Yi-Du Zhang

  2. Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing, 100190, China

    Chun-Cheng Zang

  3. College of Mechanical Engineering and Automation, Liaoning University of Technology, Jinzhou, 121001, Liaoning, China

    Jin-Hua Li, Hong Zeng & De-Qiang Zhang

Authors
  1. Chun-Cheng Zang
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  2. Yan-Zhong Wang
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  3. Yi-Du Zhang
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  4. Jin-Hua Li
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  5. Hong Zeng
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  6. De-Qiang Zhang
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Correspondence to Chun-Cheng Zang.

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Zang, CC., Wang, YZ., Zhang, YD. et al. Microstructure and wear-resistant properties of NiCr–Cr3C2 coating with Ni45 transition layer produced by laser cladding. Rare Met. 34, 491–497 (2015). https://doi.org/10.1007/s12598-015-0492-7

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  • DOI: https://doi.org/10.1007/s12598-015-0492-7

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