摘要
应用2kW-CO_2激光器,在 GH140合金表面进行 NiCoCrAlY 包覆涂层重熔处理。结果表明,控制恰当激光工艺参数,可使激光重熔区成分稀释度低,组织细化,涂层致密性、附着力显著提高。从而有效改善了抗蚀性和抗冷热疲劳性,并保持原涂层良好的塑性。
NiCoCrAlY cladding has been remelted on the GH140 alloy surface by2kW—CO2 gas laser.The results show that,by controlling proper laser technologicalparameters,structure can be fined,coating compactness and adhesion be obviously en-hanced and the composition dilution is very low in the laser-remelting zone.Thus,corro-sion resistance and thermal fatigue resistance will be effectively improved,and the goodplasticity of the original coating will be remained.
关键词
高温合金
表面
包覆涂层
激光重熔
cladding
laser remelting
corrosion resistance
thermal fatigue resistance
