A Phase-Field Simulation of Nucleation from Subgrain and Grain Growth in Static Recrystallization
A new recrystallization phase-field method is proposed, in which the three stages of 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 method 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 recrystallization as a sequence of computational procedure.
Yuri Estrin and Hans Jürgen Maier
M. Muramatsu et al., "A Phase-Field Simulation of Nucleation from Subgrain and Grain Growth in Static Recrystallization", Materials Science Forum, Vols. 584-586, pp. 1045-1050, 2008