Study on Creep Behaviors of GH3230 Superalloy With Side Notches or a Center Inclined Hole at 900°C and 1000°C

GH3230 superalloy is one of the most promising materials for aviation engine hot components, characterized by lots of holes and prone to creep failure. To study the effect of the side notches or center inclined hole on creep behaviors of GH3230 superalloy, a series of creep experiments and numerical simulations based on Sinh creep-damage constitutive model were conducted at 900°C and 1000°C. The influence mechanism of notch strengthening on creep life was analyzed under different notch sizes. The results show that the opposite combination of stress triaxiality and multiaxial stress caused by notches determines the creep damage and life. With the increase of the stress concentration factor, the notch strengthening factor demonstrates a trend of first increasing and then decreasing, whereas the increase in net stress is accompanied by the augmentation of notch strengthening factor under the same stress concentration factor.