Deformation and Fracture of Single Crystals of Nickel-Base Superalloys CMSX-4 and CMSX-10 under Conditions of Creep and Fatigue Loading

—Single crystals of superalloys CMSX-4 and CMSX-10 were tested for creep at 750-1100°C and low-cycle fatigue at 700°C. It is shown that the type of creep curves depends on the test temperature. It is found that during creep and fatigue tests the specimens are fractured from the near-surface casting pores. The pores significantly decrease the fatigue life, but do not have a significant effect on the long-term creep strength.