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采用CO_2激光器在GH4169高温合金表面激光熔覆Fe基合金。借助光学显微镜、扫描电镜、X射线衍射仪、能谱仪、显微硬度计对熔覆组织结构、物相、组成成分、硬度进行了分析。结果表明:熔覆层组织由Cr_(9.1)Si_(0.9)、CrFe_4、γ-(Fe-Ni)等相组成,受熔道搭接和“二次加热”效应的影响,搭接区内的组织出现不均匀,在二次熔化区出现较多的胞状和等轴晶组织,搭接区的显微硬度要低于无搭接区的显微硬度。激光熔覆区的显微硬度平均值为532 HV,是GH4169显微硬度(210 HV)的2.5倍。选择优化的激光工艺参数,获得了性能良好的熔覆层组织。
Laser cladding of Fe - based alloy on GH4169 superalloy by CO_2 laser. The microstructure, phase, composition and hardness of the cladding were analyzed by optical microscope, scanning electron microscopy, X-ray diffraction, energy dispersive spectroscopy and microhardness tester. The results show that the microstructure of the coating is composed of Cr9.1Si9, CrFe4 and γ- (Fe-Ni) phases, which are affected by the overlap of the melt channels and the effect of “secondary heating” The internal organization appeared uneven. More cellular and equiaxed grains appeared in the secondary melting zone. The microhardness of the overlap zone was lower than that of the non-overlapping zone. The average microhardness of the laser cladding zone was 532 HV, 2.5 times the microhardness (210 HV) of GH4169. Select the optimized laser process parameters, to obtain a good performance cladding layer organization.