中文摘要：

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。

英文摘要：

The microstructure and composition of laser cladding of Fe313 powder after laser milling were analyzed, and the hardness of the cross section of the cladding layer was tested.The results show that the laser cladding layer has the grain refinement region and the heat affected zone after laser milling. The average power has great influence on the refinement region, the higher the power is, the deeper the depth of the refinement region is, and the pulse width has little influence on it. The boron content in the refinement region is 0%, the heat affected zone precipitates boride. The hardness of cladding layer increases with the increase of power firstly, then decreases. The hardness enhancement region increases with the increase of power. The hardness of heat affected zone decreases.