Abstract A fundamental understanding of carbon partitioning and the martensite/austenite interface migration during the Quenching & Partitioning (Q&P) process is essential for tailoring the microstructures of the advanced Q&P steels. In this study, two Q&P models (QP-LE and QP-PE), in which effects of substitutional alloying elements have been considered by assuming Local Equilibrium (LE) or Paraequilibrium (PE) at the interface, are proposed to simulate the kinetics of martensite/austenite interface migration and carbon partitioning in the Fe-C-Mn-Si steels. The QP-LE and QP-PE models predict that whether the interface migrates or not and its moving direction are dependent on quenching/partitioning temperature (QT/PT) and alloy composition. A careful comparison between experiments and model predictions indicates that the dependence of interface migration behavior on QT/PT indirectly measured by experiments during the Q&P process could be explained reasonably well by the QP-LE model, rather than the Constrain Carbon Equilibrium (CCE) model and the QP-PE model. The carbon partitioning behavior is also well predicted by the QP-LE model while the QP-PE model predictions deviate significantly from experiments. The current study suggests that interfacial partitioning of Mn plays a significant role in carbon partitioning and interface migration during the Q&P process.

中文翻译：

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阐明 Mn 分配对 Fe-C-Mn-Si 钢淬火和分配过程中界面迁移和碳分配的影响：建模和实验

摘要 对淬火和分配 (Q&P) 过程中碳分配和马氏体/奥氏体界面迁移的基本了解对于定制高级 Q&P 钢的微观结构至关重要。在这项研究中，提出了两种 Q&P 模型（QP-LE 和 QP-PE），其中通过假设界面处的局部平衡（LE）或准平衡（PE）来考虑置换合金元素的影响，以模拟Fe-C-Mn-Si 钢中的马氏体/奥氏体界面迁移和碳分配。QP-LE 和 QP-PE 模型预测界面是否迁移及其移动方向取决于淬火/分配温度 (QT/PT) 和合金成分。实验和模型预测之间的仔细比较表明，QP-LE 模型而不是约束碳平衡 (CCE) 模型可以很好地解释 Q&P 过程中通过实验间接测量的 QT/PT 界面迁移行为的依赖性和 QP-PE 模型。QP-LE 模型也很好地预测了碳分配行为，而 QP-PE 模型的预测明显偏离了实验。目前的研究表明，Mn 的界面分配在 Q&P 过程中对碳分配和界面迁移起着重要作用。而不是约束碳平衡 (CCE) 模型和 QP-PE 模型。QP-LE 模型也很好地预测了碳分配行为，而 QP-PE 模型的预测明显偏离了实验。目前的研究表明，Mn 的界面分配在 Q&P 过程中对碳分配和界面迁移起着重要作用。而不是约束碳平衡 (CCE) 模型和 QP-PE 模型。QP-LE 模型也很好地预测了碳分配行为，而 QP-PE 模型的预测明显偏离了实验。目前的研究表明，Mn 的界面分配在 Q&P 过程中的碳分配和界面迁移中起着重要作用。