Phase Field Simulation of Grain Growth in Ti-6A1-4V during High Temperature Deformation

Phase field simulations were carried out to study the effect of plastic strain on the growth of beta grains in Ti-6A1-4V alloy during high temperature forging. In the phase field model, strain is represented by the energy stored in the deformed grains. Our simulations of the post-deformation growth show that compared with the grain growth neglecting the stored energy, the final average grain size is large after deformation, if no re crystallization is considered. The grain growth under continuous deformation is simulated by applying the uniform topology deformation technique based on vector operation, The change of grain morphology during growth can be tracked in detail. The results show that the effect of the stored energy on the beta growth is trivial under small strain, while as strain increases, the increase of the stored energy drives the deformed grains, to shrink faster, and the grains are elongated and rotated, as a result of the slip deformation in the grains with preferred orientations.