A Phase-Field Simulation of Nucleation from Subgrain and Grain Growth in Static Recrystallization
Mayu MURAMATSU, Hideyasu AJIOKA, Yoshiteru AOYAGI, Yuichi TADANO and Kazuyuki SHIZAWA
Abstract:A new recrystallization phase-field model is proposed, in which the three stages of static recrystallization phenomena, I.e., recovery, nucleation and nucleus growth are sequentially taken into account in a computation. From the information of subgrain patterns and crystal orientations in a polycrystal that are obtained by a dislocation-crystal plasticity FE analysis based on a reaction-diffusion model, subgrain groups surrounded by high angle boundary are found out. Next, subgrains in the group are coalesced into a nucleus by rotation of crystal orientation and migration of subgrain boundaries through a phase-field simulation. Then a computation of nucleus growth is performed also using the phase-field model on account of an autonomic incubation period of nucleation, in which stored dislocation energy assumes a role of driving force. It is shown that the present method can numerically reproduce the three stages of static recrystallization as a sequence of computational procedure. Key Words:Phase Transformation, Phase-Field Model, Static Recrystallization, Nucleation, Grain Growth, Subgrain