考虑粒子阻碍效应的再结晶元胞自动机模型

Modeling of Recrystallization for Material with Precipitated Fine Particles by Cellular Automaton Method

为了更合理地仿真第二相粒子材料的再结晶过程,在单相材料再结晶元胞自动机模型中引入Zener亚晶长大阻力和小粒子钉扎晶界的元胞取向转换规则,创建了细小的第二相粒子材料的再结晶元胞自动机模型,实现了铁素体钢板的再结晶退火过程仿真.结果表明:所建模型全面考虑了变温-回复、晶粒变形储能不均、亚晶异常长大形核机制和小粒子阻碍效应的综合影响,模拟的组织演变及其动力学分析揭示了与理论和实际相符的规律:小粒子尺寸越小、数量越多,再结晶抑制效应越强,再结晶的孕育期及过程越长.

In order to rationally simulate the recrystallization process of the material with second- phase particles, a cellular automata model for recrystallization of single-phase material with tiny second phase particles was created by introducing the Zener force to resist sub-grain growth and the rule of cell orientation transformation of grain boundary pinning, and the recrystallization annealing process of a ferritic steel was simulated. The results show that the model fully consider the combined effects of recovery at variable temperature, non-uniform deforming storage energy, abnormal nucleation and growth of sub-grain, and impeding by fine particles on recrystallization, and the simulated microstructure evolutions and their dynamics analysis reveals the same laws both in theories and in practice, that is, the smaller is particle size and the more is its number, the stronger is the effect of inhibiting recrystallization and the longer are the incubation period and the process of recrystallization.