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:运用最近开发的连续动态再结晶场全水平集模型来模拟热压缩和随后的热处理中Zircaloy-4的再结晶。研究应变速率、最终应变和初始微观结构等因素的影响,采用实验和模拟工具进行验证。对再结晶异质性进行定量化描述。验证淬火组织显示更高水平的异质性。模拟结果令人满意地复制了实验观察结果。该模拟框架特别能够捕捉不同初始微观结构引起的再结晶异质性。最后,通过不同的数值公式进行额外模拟,指出了晶内位错密度异质性在再结晶晶粒优先生长方面的作用。