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由韧性Ni基合金基体和耐磨WC颗粒复合而成的金属基复合(MMC)涂层常被应用于严苛的磨粒磨损工况下。本研究的目的是绘制Ni基基体中WC颗粒类型、形态和数量对激光熔覆MMC涂层微观组织结构和耐磨性能的影响规律。采用ASTM-G65标准对涂层的磨粒磨损性能进行了评价,其主要受WC体积含量的影响,而对于同样的熔化程度或向基材的稀释情况以及颗粒尺寸来说,WC的形状和微观结构对其影响较小。涂层的微观组织结构分析表明,WC在熔池中的熔解程度主要受到熔池中液相金属化学成分和所选WC微观结构和数量的影响。
Metal-matrix composite (MMC) coatings composed of tough Ni-based alloy substrates and wear-resistant WC particles are often used in severe abrasive wear conditions. The purpose of this study was to characterize the effect of WC particle type, morphology and amount on the microstructure and wear resistance of laser cladding MMC coating. The abrasive wear properties of coatings were evaluated using the ASTM-G65 standard, which is primarily affected by WC volume content, while the shape and microstructure of the WC for the same degree of melting or dilution to the substrate, as well as the particle size The structure of its less affected. The microstructure analysis of the coating shows that the degree of melting of WC in the weld pool is mainly affected by the chemical composition of liquid metal in the weld pool and the microstructure and amount of selected WC.