Abstract In this work the recently proposed full field approach to model dynamic recrystallization [1] is applied to model 304L steel. The framework couples a CPFEM (crystal plasticity finite element method) model with a LS-FE (level-set finite element method) for grain boundary migration and phenomenological laws. 304L steel samples are subjected to thermomechanical tests and their flow behaviour is characterized, additionally Electron Back Scattered Diffraction (EBSD) is used to study microstructure evolutions. Part of the experimental data is used to calibrate the model parameters and describe their evolution as a function of the thermomechanical conditions. The calibrated model is used to predict the microstructural evolution of 304L steel, the results are compared with the remaining experimental measurements. The comparison shows that the model correctly predicts the flow behaviour and recrystallization fraction evolution. However the results also show that the use of classical phenomenological models limit the model capability to predict grain size evolution. Different approaches to improve the model grain size prediction are presented and compared, the results show significant improvements when compared with experimental data.

中文翻译：

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CPFEM 环境中动态再结晶的全场建模——在 304L 钢中的应用

摘要 在这项工作中，最近提出的模拟动态再结晶的全场方法 [1] 应用于 304L 型钢。该框架将 CPFEM（晶体塑性有限元法）模型与用于晶界迁移和现象学规律的 LS-FE（水平集有限元法）模型相结合。对 304L 钢样品进行热机械测试并表征其流动行为，此外还使用电子背散射衍射 (EBSD) 研究微观结构演变。部分实验数据用于校准模型参数，并将它们的演变描述为热机械条件的函数。校准后的模型用于预测 304L 钢的显微组织演变，并将结果与​​其余的实验测量结果进行比较。比较表明该模型正确地预测了流动行为和再结晶分数演变。然而，结果还表明，经典现象学模型的使用限制了模型预测晶粒尺寸演变的能力。提出并比较了改进模型晶粒尺寸预测的不同方法，与实验数据相比，结果显示出显着改进。