通过凝固重熔实验和均匀化实验,分析冷却速度、断电时间等凝固参数对GH4169合金凝固重熔过程宏观缺陷的影响。利用扫描电镜观察了GH4169均匀化前后的组织,并用EDS能谱分析了相的成分。结果表明,随着冷却速度的降低,GH4169合金凝固重熔过程出现缩松缺陷的可能性增大,而180 s以内的断电操作对缩松缺陷的分布没有明显影响。经过第一阶段均匀化处理后,Laves相已基本溶入基体,但缩松附近区域易残留大量细小的白色富Nb相和少量块状Laves相,甚至出现白色偏析条带,而富集在缩松周围的Al元素因热处理过程而氧化和烧损,扩大了宏观缺陷的范围。 Through solidification remelting experiment and homogenization experiment, the influence of solidification parameters such as cooling rate and power-off time on macroscopic defects during solidification and remelting of GH4169 alloy was analyzed. The microstructure of GH4169 before and after homogenization was observed by scanning electron microscopy and the phase composition was analyzed by EDS. The results show that as the cooling rate decreases, the possibility of shrinkage defects in the solidification remelting process of GH4169 alloy increases. However, the power failure operation within 180 s has no obvious effect on the distribution of shrinkage defects. After the first stage of homogenization, the Laves phase has basically dissolved into the matrix, but a large number of fine white Nb-rich phase and a small amount of massive Laves phase are easily remained in the vicinity of the shrinkage, even white segregation bands appear, The Al element around the pine is oxidized and burned due to the heat treatment process, expanding the range of macro defects.