Self-consistent constitutive modeling of the creep damage behaviour of nickel-base directionally solidified superalloys with different grain orientations

A self-consistent creep damage constitutive model is developed for nickel-base directionally solidified superalloys. Grain degradation and grain boundary voiding are considered. The model parameters are determined from the creep test data of single crystal and directionally, solidified superalloy with a special grain orientation. The numerical analysis shows that the model creep damage behaviours of nickel-base directionally solidified superalloys with different grain orientations are in good agreement with the experimental data.