采用同轴送粉激光熔覆技术在42CrMo合金钢基体表面制备WC-Co颗粒增强NiCrBSi复合涂层（NiCrBSi/WC-Co复合涂层），研究了复合涂层的物相组成、显微组织、显微硬度和耐磨性能。结果表明：复合涂层主要由γ-Ni固溶体、WC、FeNi₃、B₂Co₃、CoC_x、FeCr_0.29Ni_0.16C_0.06、W₃C、Co₃W₃C₆等物相组成；复合涂层顶部为方向杂乱的细小树枝晶，中部为较粗大的柱状树枝晶，底部为垂直于结合界面生长的胞状晶，涂层与基体形成了良好的冶金结合；复合涂层表面的平均硬度为810 HV，远高于基体的（270 HV），磨损质量损失为0.3 mg，远低于基体的（1.9 mg），其磨损机制主要为磨粒磨损；复合涂层可显著提高42CrMo钢基体的耐磨性能。

WC-Co particle reinforced NiCrBSi composite coating (NiCrBSi/WC-Co composite coating) was prepared on the surface of 42CrMo alloy steel substrate by coaxial powder feeding laser cladding technique. The phase composition, microstructure, microhardness and wear resistance of the composite coating were investigated. The results show that the primary phases of the composite coating were composed of γ-Ni solid solution, WC, FeNi₃, B₂Co₃, CoC_x, FeCr_0.29Ni_0.16C_0.06, W₃C and Co₃W₃C₆. There were disoriented fine dendrite crystals at the upper area of the composite coating, massive columnar dendrite crystals in the middle area and cellular crystal which grew perpendicular to the interface at the bottom area. A good metallurgical bonding between coating and substrate was obtained. The average microhardness of the composite coating surface were 810 HV, which was much higher than that of the substrate (270 HV); the wear mass loss was 0.3 mg, which was much lower than that of the substrate (1.9 mg); the wear mechanism was abrasive wear. The composite coating could significantly improve the wear resistance of 42CrMo steel substrate.