本文研究了在 5 0 # 钢表面激光熔覆KF - 12 0不锈钢粉的工艺 ,得到了无裂纹、无气孔、组织致密的激光熔覆层。显微组织观察和显微硬度测试表明熔覆层具有很好的耐腐蚀性能和高的硬度。当激光功率为 1 6和 1 8kW时 ,熔覆层硬度高达 730Hv左右 ,与基体分界面清晰 ,而当激光功率为 2 0和 2 2KW时 ,硬度分别降为 6 80和 6 5 0Hv左右 ,与基体之间无明显的分界面。这两种情况分别适用于不同的应用场合。 In this paper, the laser cladding of KF - 120 stainless steel powder on the surface of 50 # steel has been studied, and the laser cladding layer without cracks, no pores and dense structure has been obtained. Microstructure observation and microhardness tests show that the cladding has good corrosion resistance and high hardness. When the laser power is 16 and 18kW, the hardness of the cladding layer is as high as about 730Hv and the interface with the substrate is clear. When the laser power is 20 and 22KW, the hardness decreases to about 6 80 and 6 5 0Hv, respectively, There is no obvious interface between the substrates. These two cases are suitable for different applications.