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利用DL-T5000型二氧化碳激光器在40Cr表面熔覆镍基合金,分析了激光熔覆层的显微组织,测试了其显微硬度及磨损性能。结果表明:所制得熔覆层组织致密、无裂纹,与基体形成了良好的冶金结合。从熔覆层表面到基体热影响区,组织依次为大量的树枝晶、等轴晶、柱状晶。熔覆层的硬度较基体提高了4倍,熔覆层磨损量约为基体磨损量的1/3,熔覆层耐磨性能增强的主要原因是镍基合金与涂层元素镍、铬等固溶强化和碳化物等析出相的强化作用所致。
The microstructure of laser cladding layer was analyzed by using DL-T5000 carbon dioxide laser cladding on the surface of 40Cr. The microhardness and wear resistance of the laser cladding layer were tested. The results show that the prepared cladding layer has compact structure and no cracks, and forms a good metallurgical bond with the substrate. From the surface of cladding layer to the heat-affected zone of the matrix, there are a large number of dendrite, equiaxed and columnar crystals in turn. The hardness of the cladding layer increased by 4 times compared with that of the matrix layer, and the wear amount of the cladding layer was about 1/3 of that of the substrate. The main reason that the wear resistance of the cladding layer is enhanced is that the Ni- Due to the strengthening effect of precipitation and precipitation of carbides and the like.