采用激光熔覆技术在38CrMoAl钢表面制备了不同纳米TiC/C添加量的镍基复合涂层。利用现代微观分析技术和性能检测手段,系统分析了纳米TiC/C添加量对镍基复合涂层微观组织形貌和性能的影响规律。结果表明,不同纳米TiC/C添加量镍基复合涂层主要是由γ-Ni、Ni3B和M23C6相组成。但有所不同的是,随着纳米TiC/C添加量的增加,γ-Ni树枝晶的数量呈现出先增后减的变化趋势,而其尺寸的变化趋势则相反。在纳米TiC/C的质量分数超过3.5%时,组织中开始有明显TiC颗粒存在,且其数量和尺寸呈逐渐增加的变化趋势。由于受晶粒细化和TiC硬质强化这两个关键因素的影响,复合涂层的硬度随着纳米TiC/C添加量的增加而升高,而耐磨性则在纳米TiC/C添加量为5.0%时达到最高,其源于细小TiC硬质相低的缺陷及其与周围基体高的协调变形能力。 Nickel-based composite coatings with different nano-TiC / C additions were prepared on the surface of 38CrMoAl steel by laser cladding. The influences of nano-TiC / C content on microstructure and properties of Ni-based composite coatings were systematically analyzed by means of modern microanalysis and performance testing. The results show that the different amount of nano-TiC / C Ni-based composite coating is mainly composed of γ-Ni, Ni3B and M23C6 phase composition. However, the difference is that with the increase of nano-TiC / C content, the amount of dendrites in γ-Ni dendrites increases first and then decreases, while the trend of their size changes in the opposite direction. When the mass fraction of nano-TiC / C exceeds 3.5%, obvious TiC particles begin to appear in the microstructure, and the number and size of TiC particles gradually increase. Due to the influence of the two key factors of grain refinement and TiC hardness strengthening, the hardness of the composite coating increases with the addition of nano-TiC / C, while the wear resistance increases with the addition of nano-TiC / C Is 5.0%, which is due to the low defects of the fine TiC hard phase and its high coordination deformation capacity with the surrounding matrix.