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研究了一种新型镍基单晶高温合金长期时效过程中γ’相形貌的变化。结果表明,在950、1 000、1 050℃下时效0~1 500 h时,γ’相形态从最初的立方体形貌逐渐演化形成了不规则的条形、L形、迷宫形等。时效过程中,枝晶间γ’相的粗化速率明显高于枝晶干处的粗化速率。随时效温度地提高,γ’相的粗化速率加快。枝晶干处与枝晶间区域γ/γ’相界面共格应变能的差异是枝晶间与枝晶干区域γ’相粗化程度存在差异的主要原因。枝晶干处γ’相的粗化激活能与枝晶间处γ’相的粗化激活能分别为451 kJ·mol-1和345 kJ·mol-1。
The change of γ ’phase morphology of a new nickel-base single crystal superalloy during long-term aging was studied. The results show that the morphology of γ ’phase gradually evolves from the initial cubic morphology at 950,1000,1 050 ℃ for 0-1,500 h to form irregular stripes, L shape and labyrinth shape. During the aging process, the coarsening γ ’phase coarsening rate was significantly higher than dendrite dry coarsening rate. As the aging temperature increases, the coarsening rate of γ ’phase increases. The difference in the coherent strain energy at the γ / γ ’phase interface between the dendrites and dendrites is the main reason for the difference in the coarsening degree of the γ’ phase between the dendrite and dendrites. The coarsening activation energies of γ ’phase and dendrite intergranular γ’ phase in dendrite were 451 kJ · mol-1 and 345 kJ · mol-1, respectively.