A recently developed full field level-set model of continuous dynamic recrystallization is applied to simulate zircaloy-4 recrystallization during hot compression and subsequent heat treatment. The influence of strain rate, final strain and initial microstructure is investigated, by experimental and simulation tools. The recrystallization heterogeneity is quantified. This enables to confirm that quenched microstructures display a higher extent of heterogeneity. The simulation results replicate satisfactorily experimental observations. The simulation framework is especially able to capture such recrystallization heterogeneity induced by a different initial microstructure. Finally, the role of intragranular dislocation density heterogeneities over the preferential growth of recrystallized grains is pointed out thanks to additional simulations with different numerical formulations.

翻译：采用最近开发的全场水平集连续动态再结晶模型，模拟了Zircaloy-4在热压缩及后续热处理过程中的再结晶行为。通过实验与模拟手段，系统研究了应变速率、最终应变及初始微观组织的影响。量化分析了再结晶的不均匀性，证实了淬火态微观组织具有更高程度的不均匀性。模拟结果较好地复现了实验观察现象，且该模拟框架尤其能够捕捉因初始微观组织差异导致的再结晶不均匀性。最后，通过不同数值公式的辅助模拟，揭示了晶内位错密度不均匀性对再结晶晶粒择优生长的作用机制。