Microstructure and wear property of laser cladded WC particles reinforced CoCrFeNiMo composite coatings on Cr12MoV steel

Abstract

WC particles reinforced CoCrFeNiMo high-entropy alloy (HEA) composite coatings were prepared on Cr12MoV steel successfully by laser cladding technology to improve the wear resistance of substrates. Effect of WC content on microstructure and wear property of the composite coatings was studied in detail. Large numbers of carbides with four main types: primary carbide crystals, eutectic structures, massive crystals growing along the periphery of the remaining WC particles and incompletely fused WC particles, were found to exist in the WC/CoCrFeNiMo composite coatings. With increasing WC content, the microhardness of coatings is gradually improved while the average friction coefficients follow the opposite trend due to solid solution strengthening and second phase strengthening effect. The maximum microhardness and minimum friction coefficient are HV_0.2 689.7 and 0.72, respectively, for the composite coating with 30 wt.% WC, the wear resistance of the substrate is improved significantly, the wear mechanisms are spalling wear and abrasive wear due to their high microhardness.

Keywords

laser cladding / CoCrFeNiMo coating / WC particles / microstructure / wear resistance

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