研究了激光铣削后Fe313粉末激光熔覆层的显微组织及成分的变化,并测试了熔覆层横截面的硬度。结果表明:激光铣削后的熔覆层有界面明显的晶粒细化区域、热影响区域。平均功率对细化区域影响较大,功率越高,细化区域深度越深;脉宽对其影响较小。细化区域的硼含量为0%,热影响区域析出硼化物。熔覆层的硬度随着功率增大先增大后减小,硬度强化区域随功率增大而增大,热影响区的硬度软化。 The microstructure and composition of the laser cladding layer after laser milling were investigated. The hardness of the cladding layer was measured. The results show that the laser cladding layer has obvious grain refinement and heat affected zone at the interface. The average power has a great influence on the thinning area. The higher the power, the deeper the depth of the thinning area. The smaller the pulse width is. The boron content in the refining zone is 0%, boride is precipitated in the heat-affected zone. The hardness of cladding layer first increases and then decreases with the increase of power, while the hardness enhancement area increases with the increase of power, and the hardness of HAZ softens.