【摘要】 研究了激光熔覆工艺参数和Y2O3含量对航空发动机叶片铸造缺陷激光熔覆开裂敏感性的影响。结果表明,当激光工艺参数P=1.5kW,V=180、190mm/min,d=3mm以及Y2O3含量为1.5wt%时,可在铸造镍基高温合金叶片上获得无裂纹的修复涂层。当Y2O3含量高于或低于1.5wt%时,熔覆层内部或熔覆层表面产生裂纹。在最佳工艺参数条件下加入复合变质剂可进一步细化涂层的组织。更多还原

【Abstract】 Effects of laser cladding parameters and content of Y₂O₃ on thermal crack sensibility of aeroengine blade with cast defect were studied.The results show that when P=1.5kW,V=180 and 190mm/min,d=3mm,content of Y₂O₃ is 1.5wt%,the coating of laser cladding without crack can be obtained on the cast blade of high temperature Ni based alloy.When the content of Y₂O₃ is higher or lower than 1.5wt%,crack will appear in inside or on the surface of the coating.Under the optimum laser cladding parameters,adding modifying agent can further fine the microstructure of coating.更多还原