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对Ｓｔｅｌｌｉｔｅ合金和ＮＩＣｒＳｉＢ合金在高功率激光熔覆下的裂纹现象和行为进行了实验研究。表明Ｓｔｅｌｌｉｔｅ合金对裂纹不敏感，能获得表面光洁、内部致密、无缺陷的熔覆层。ＮｉＣｒＳｉＢ合金对裂纹非常敏感，往往出现大量横向宏观裂纹。ＮＩＣｒＳｉＢ合金的裂纹主要起源于熔覆层与基体的交界面，裂纹通常向熔覆层扩展而穿过整个熔覆，多道搭接时，裂纹会向前道和后道横向传递。裂纹属冷裂纹范畴。裂纹的产生和行为是由熔覆层凝固过程中产生的应力（应变）与熔覆材料的强度和塑性之间的动态相互作用所决定的，并与熔覆材料自身的物理特性以及凝固特性和凝固组织有关。
The crack phenomenon and behavior of Stellite alloy and NICrSiB alloy under high power laser cladding were investigated experimentally. It shows that Stellite alloy is insensitive to the crack and can obtain a smooth, dense and defect-free cladding layer. NiCrSiB alloy is very sensitive to cracks, often a large number of horizontal macroscopic cracks. The cracks in NICrSiB alloy mainly originate from the interface between the cladding layer and the substrate. The cracks usually extend to the cladding layer and pass through the entire cladding layer. When lapped, the cracks propagate transversely to the front and rear channels. Crack is a cold crack category. Crack generation and behavior are determined by the dynamic interaction between the stress (strain) produced during the solidification of the cladding layer and the strength and plasticity of the cladding material, and are related to the physical properties of the cladding material itself as well as the solidification properties and Solidification related.