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首页> 外文期刊>Journal of Materials Engineering and Performance >An Analysis on the Constitutive Models for Forging of Ti6Al4V Alloy Considering the Softening Behavior
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An Analysis on the Constitutive Models for Forging of Ti6Al4V Alloy Considering the Softening Behavior

机译：考虑软化行为的Ti6Al4V合金构成模型分析

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摘要

This paper developed high-temperature deformation constitutive models for a Ti6Al4V alloy using an empirical-based Arrhenius equation and an enhanced version of the authors' physical-based EM + Avrami equations. The initial microstructure was a partially equiaxed alpha + beta grain structure. A wide range of experimental data was obtained from hot compression of the Ti6Al4 V alloy at deformation temperatures ranging from 720 to 970 A degrees C, and at strain rates varying from 0.01 to 10 s(-1). The friction- and adiabatic-corrected flow curves were used to identify the parameter values of the constitutive models. Both models provided good overall accuracy of the flow stress. The generalized modified Arrhenius model was better at predicting the flow stress at lower strain rates. However, the model was inaccurate in predicting the peak strain. In contrast, the enhanced physical-based EM + Avrami model revealed very good accuracy at intermediate and high strain rates, but it was also better at predicting the peak strain. Blind sample tests revealed that the EM + Avrami maintained good predictions on new (unseen) data. Thus, the enhanced EM + Avrami model may be preferred over the Arrhenius model to predict the flow behavior of Ti6Al4V alloy during industrial forgings, when the initial microstructure is partially equiaxed.
机译：本文使用基于实验的Arhenius方程和提升版本的基于物理的EM + Avrami方程式开发了Ti6Al4V合金的高温变形本构模型。初始组织是部分等式的α+β谷物结构。从720至970℃的变形温度下的Ti6Al4 V合金的热压缩获得了各种实验数据，并且在0.01至10s（-1）的应变率下的菌株率。摩擦和绝热校正的流动曲线用于识别本构模型的参数值。两种型号都提供了流量应力的良好整体精度。广义修改的Arhenius模型更好地预测降低应变率的流量应力。然而，该模型在预测峰值应变时是不准确的。相反，增强的物理基础EM + AVRAMI模型在中间体和高应变率下显示出非常好的准确度，但在预测峰值应变时也更好。盲目样本测试显示，EM + Avrami对新的（看不见的）数据保持了良好的预测。因此，当初始微观结构部分等式时，增强的EM + AVRAMI模型可以优选在Arrhenius模型上以预测工业锻件期间Ti6Al4V合金的流动性能。

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