Abstract

A simulation model of recrystallization and grain growth has been developed to investigate grain structure evolution during deformation and heat treatment in polycrystalline U-10 wt pct Mo (U-10Mo) fuel. Experimentally obtained U-10Mo post-homogenization microstructures were used as input for closed-loop simulations of multiple rolling passes, intermediate heating, and final annealing. Finite element model calculations of deformation and Potts model simulations of recrystallization and grain growth were used to iteratively inform each subsequent stage of simulation. The model was then applied to predict the grain structure evolution during multiple-pass hot rolling and annealing of U-10Mo and benchmarked against experimentally observed U-10Mo recrystallization behavior. The results showed that our model was able to capture the coupling between deformation and recrystallization as a function of microstructure, including particle stimulated nucleation and recrystallization nucleation on grain boundaries. Additionally, we have achieved reasonable quantitative agreement with U-10Mo recrystallization and grain growth behavior.

中文翻译：

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U-10Mo多道次轧制和退火的重结晶和晶粒生长模拟

抽象的

建立了重结晶和晶粒长大的模拟模型，以研究多晶U-10 wt pct Mo（U-10Mo）燃料在变形和热处理过程中晶粒结构的演变。实验获得的U-10Mo后均质微结构被用作多个轧制道次，中间加热和最终退火的闭环模拟的输入。变形的有限元模型计算和再结晶和晶粒长大的Potts模型模拟用于迭代地告知每个后续模拟阶段。然后将该模型用于预测U-10Mo的多道次热轧和退火过程中的晶粒结构演变，并以实验观察到的U-10Mo重结晶行为为基准。结果表明，我们的模型能够捕获变形和再结晶之间的耦合，作为微观结构的函数，包括颗粒激发的成核和晶界上的再结晶成核。此外，我们已经与U-10Mo重结晶和晶粒生长行为达成了合理的定量协议。