采用激光熔覆技术在45#钢基材上制备碳化钨/钴基合金复合涂层, 借助XRD、SEM以及硬度测试和室温耐磨实验, 研究复合涂层的组织和耐磨性能。结果表明, 碳化钨/钴基合金复合涂层的组织由固溶体枝晶与枝晶间共晶组织组成, 其枝晶间共晶组织的碳化物含量比钴基合金涂层高; 与钴基合金涂层相比, 碳化钨/钴基合金复合涂层的显微硬度和耐磨性能均明显提高, 且磨损失重减少了48%; 钴基合金涂层的磨粒磨损机理主要为微观切削, 碳化钨/钴基合金复合涂层的磨粒磨损机理主要为挤压剥落。

School of Mechatronics Engineering, Shenyang Aerospace University, Shenyang, Liaoning 110136, ChinaThe tungsten carbide/cobalt-based alloys composite coating was manufactured by laser cladding technology on the 45 steel matrixes. The microstructure and wear-resistant properties of the prepared composite coating were studied by XRD, SEM, hardness test and wear resistance test. It was found that the microstructure of tungsten carbide/cobalt-based alloys composite coating was consisted of solid solution dendrites and interdendritic eutectic structure whose carbide content was higher than that of the cobalt-based alloys coating. Compared with the cobalt-based alloys coating, the microhardness and wear-resistant properties of the composite coating improved obviously, and the wear mass loss reduced by 48%. The feature of abrasive wear in the cobalt-based alloys coating and the tungsten carbide/cobalt-based alloys composite coating was characterized by micro-cutting and debonding respectively.