Evaluation of Creep Deformation and Mechanical Properties of Nickel-based Superalloys through FE Analysis Based on Crystal Plasticity Models

The shape and the size of the γ ′ phase s are the controlling factors for the mechanical and creep properties of nickel-based super-alloys. In order to take into account of the effect of these underlying microstructures on the deformation behavior of these alloys, a multi-scale approach is essential. In this work, a homogenized dislocation density based crystal p asticity model has been developed from a detailed model containing γ − γ ′ phase s exclusively at the lower length scale. The mechanisms like anti-phase boundary shearing and micro-twinning etc. have been incorporated. The model has been used to simulate the creep deformation behavior of single crystal experiments. The results of simulation were compared to those of experiment and were found to be satisfactory.