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首页> 外文期刊>Journal of Materials Engineering and Performance >A Two-Stage Physical-Based Model for Predicting Flow Stress of As-cast TiAl Alloy Under Hot Deformation Conditions
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A Two-Stage Physical-Based Model for Predicting Flow Stress of As-cast TiAl Alloy Under Hot Deformation Conditions

机译：一种两级物理基于物理模型，用于在热变形条件下预测铸造Tial合金的流量应力

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摘要

The hot deformation behavior of Ti-30Al-4.2Mn-4.5Nb-0.2B alloy was investigated using the isothermal compression experiment at temperatures of 1020-1200?°C and strain rates of 0.001-1?s_(?1). The flow stress was sensitive to the deformation parameters like temperature and strain rate, which decreases with the increase in temperature and decrease in strain rates. Based on the true stress-true strain data, a two-stage physical-based model was proposed to describe the flow stress curve of as-cast TiAl alloy during hot deformation process. For establishing the model, at first, the flow curves of dynamic recovery (DRV) were modeled by employing stress-dislocation relation and adjusting dislocation annihilation coefficient Ω . Then, the flow curves of dynamic recrystallization (DRX) were modeled by considering the dynamic softening behavior into Avrami equation. Finally, the flow curves in the entire deformation stages could be described by embedding the predicted data of DRV model (i.e., flow stress before the critical strain) into the predicted data by DRX model (i.e., flow stress after the critical strain). The critical strain for initiation of DRX was determined by the double-differentiation method. To evaluate the applicability and effectiveness of DRX kinetics equation, the DRX curves were calculated and were consistent with the microstructure observation. Comparison between the experimental and predicted data shows that the proposed physical-based model can well forecast the flow stress under a wide working domain.
机译：使用等温压缩实验在1020-1200Ω℃的温度下进行Ti-30Al-4.2Mn-4.5NB-0.2b-0.2b合金的热变形行为，质量率为0.001-1Ω_（α1）。流量应力对变形参数敏感，如温度和应变率，随着温度的增加和应变速率的降低而降低。基于真正的应力 - 真菌数据数据，提出了一种基于两阶段的基于物理模型，描述了热变形过程中铸造的铸件合金的流量应力曲线。为了首先建立模型，通过采用应力脱位关系和调整位错湮灭系数ω来建模动态恢复（DRV）的流曲线。然后，通过将动态软化行为考虑到AVRAMI方程来建模动态再结晶（DRX）的流动曲线。最后，通过将DRV模型（即，临界应变前的流量应变之前的预测）嵌入DRX模型（即，临界应变之后的流量应力）来描述整个变形阶段的流程曲线。通过双分化法测定用于引发DRX的临界应变。为了评估DRX动力学方程的适用性和有效性，计算DRX曲线并与微观结构观察一致。实验和预测数据之间的比较表明，所提出的基于物理的模型可以在宽工作域下预测流量应力。

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