With the development of nickel-based single crystal superalloys, the quantity of micro-pores generating in solution treatment has increased, and there is an urgent need to develop a solution treatment design method that takes account of both residual eutectics and micro-pores. Therefore, the effect of heating processing on the formation of micro-pores during solution treatment of a 4th generation nickel-based single crystal superalloy has been investigated using high-resolution transmission X-ray tomography and electron probe microscopic analyzer. In the temperature range below interdendritic γ' phases solvus, decreasing the heating rate can limit the formation of micro-pores significantly. However, heating method (continuous or stepwise), has a little effect on micro-pores formation. The influence of heating processing on micro-pores formation is associated with composition homogenization degree of the alloy before eutectics dissolve. Moreover, it is found that the dissolution of eutectics is most likely the reason for substantial formation of micro-pores. Finally, a designing thinking for heating processing of solution treatment for high generation nickel-based single crystal superalloys is proposed.

随着镍基单晶高温合金的发展，固溶处理产生的微孔数量增多，迫切需要开发一种兼顾残余共晶和微孔的固溶处理设计方法。因此，使用高分辨率透射 X 射线断层扫描和电子探针显微分析仪研究了热处理对第四代镍基单晶高温合金固溶处理过程中微孔形成的影响。在低于枝晶间γ'相溶解线的温度范围内，降低加热速率可以显着限制微孔的形成。然而，加热方法（连续或逐步）对微孔的形成影响不大。热处理对微孔形成的影响与共晶溶解前合金的成分均匀化程度有关。此外，发现共晶的溶解很可能是微孔大量形成的原因。最后，提出了高代镍基单晶高温合金固溶处理热处理的设计思路。