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采用 ２０ｋｗ ＣＯ_２激光器及同步送粉熔覆技术，在球墨铸铁和灰口铸铁表面熔覆镍基和钴基合金，研究铸铁组织、合金粉末体系和工艺参数对熔覆层气孔和裂纹的影响。结果表明：熔覆层气孔的形成与铸铁组织、石墨形态有关，片状石墨灰口铸铁易产生气孔，而裂纹主要取决于所使用的合金体系，其中钴基司太立合金具有良好的抗裂性能。通过优化激光熔覆工艺参数，可以避免熔覆层裂纹和气孔的形成。
The effects of cast iron microstructure, alloy powder system and process parameters on the pores and cracks in the cladding layer were studied by using 20kW CO_2 laser and simultaneous powder cladding cladding technology on the surface of ductile iron and gray cast iron. The results show that the formation of cladding layer is related to the microstructure of cast iron and the morphology of graphite. The flake graphite gray cast iron tends to generate pores, and the crack mainly depends on the alloy system used. Among them, Co-based Stellite has good crack resistance . By optimizing the laser cladding process parameters, the formation of cladding cracks and pores can be avoided.