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采用YAG固体激光器于45钢表面熔覆WC/Co-Cr合金涂层,对涂层的微观组织及界面结构进行了分析。探讨了不同WC添加量对涂层硬度及摩擦磨损性能的影响。结果表明,涂层主要由CrCo、WC以及W2C相组成,还含有一定的Co的固溶体以及Cr7C3相。涂层微观组织呈大致等轴的细小网状共晶组织,涂层与基体呈冶金结合,表面硬度在1100 HV0.02左右。WC含量对涂层硬度以及磨损性能影响较大,呈显著的磨粒磨损机制。但当WC含量增加到20wt%以后,表面微裂纹增多,脆性增大,对使用寿命有不利影响。
The microstructure and interfacial structure of WC / Co-Cr alloy coating were analyzed by YAG solid laser cladding on the surface of 45 steel. The effects of different amount of WC on the hardness and friction and wear properties of the coating were discussed. The results show that the coating mainly consists of CrCo, WC and W2C phases, and also contains certain Co solid solution and Cr7C3 phase. The coating microstructure is roughly equiaxed mesh eutectic structure, the coating and the substrate was metallurgical bonding, the surface hardness of about 1100 HV0.02. WC content of the coating hardness and wear a greater impact, showed a significant abrasive wear mechanism. However, when WC content increased to 20wt%, the surface microcracks increased, the brittleness increased, which had an adverse effect on the service life.