两种高代次镍基单晶高温合金热机械疲劳中的再结晶行为

赵鹏, 谢光, 段慧超, 张健, 杜奎

Recrystallization During Thermo-Mechanical Fatigue of Two High-Generation Ni-Based Single Crystal Superalloys

ZHAO Peng, XIE Guang, DUAN Huichao, ZHANG Jian, DU Kui

图7 热机械疲劳断裂机制图(第三代和第四代单晶高温合金)

Fig.7 Diagrams of thermo-mechanical fatigue fracture mechanism (The third & fourth-generation single crystal superalloy) (a) Ni-based superalloy microstructure before deformation (b) after plastic deformation, twins are formed and intersected with each other (c) recrystallization occurs in the twin lamellae, TCP phases are formed at the intersection of twins, and cracks initiate