为进一步提高316L钢材的显微硬度，拓宽其使用范围，采用激光熔覆的方法，在316L钢材表面制备出不同比例的Fe60-WC熔覆层。研究不同比例的WC对熔覆层的截面组织、显微硬度、晶相构成的影响及原因。经过试验分析可知，当WC的质量分数为3%时，其与Fe60形成了硬质合金结构，增加了熔覆层的显微硬度。当WC的质量分数提升至5%时，熔覆层的微观结构发生了较大的改变，此时WC的质量分数虽然更多，但是熔覆层的显微硬度有所下降。结果表明，当WC的质量分数为3%时，熔覆层保持树形胞状晶，此时的显微硬度明显高于基体。x

In order to further improve the microhardness of 316L substrate and improve its application fields, different weight ratios of Fe60-WC cladding layers were prepared on the surface of 316L substrate by laser cladding. Then the morphology，microhardness, and crystal phase composition of laser cladding layers with different ratios of WC were explored. According to the experimental analysis, when the weight ratio of WC is 3%, the laser cladding reveals eutectic structure with Fe60, and its microhardness is obviously increased. Furthermore, when the weight ratio of WC increased to 5%, the microstructure of the cladding layer reduces distinctly. The result shows that when the weight ratio of WC is 3%, the microhardness of the cladding layer is obviously higher than other simples.