Hot Deformation Behavior and Zener-Holomon Parameter Constitutive Model of Ti-6Al-7Nb Alloy

2020 3rd International Conference on Advanced Electronic Materials, Computers and Software Engineering (AEMCSE) Pub Date : 2020-04-01 DOI:10.1109/AEMCSE50948.2020.00135

Mingjun Zhong, Ke-lu Wang, D. Ouyang, Xin Li, Xuan Zhou, Rui Feng

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Abstract

The thermal compression test of Ti-6Al-7Nb alloy was carried out by a Gleeble-3800 thermal simulator. The hot deformation behavior of Ti-6Al-7Nb alloy was studied under the conditions of deformation temperature 940-1030°C and strain rate 0.001-10s^-1, and the hot deformation activation energy of the alloy was calculated. The results show that the flow stress of Ti-6Al-7Nb alloy decreases with increasing the deformation temperature and increases with increasing the strain rate. Based on the peak stress, the Arrhenius constitutive model of Ti-6Al-7Nb alloy was established by Zener-Holomon parameter. The results show that the model has higher prediction accuracy for peak stress. The Pearson correlation coefficient r for the predicted value of peak stress and the experimental value is 0.96089, and the linear correlation coefficient R^2 is 0.91904. This research can be used to guide the formulation of Ti-6Al-7Nb alloy hot working process and the finite element simulation of the hot deformation process.

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Ti-6Al-7Nb合金热变形行为及Zener-Holomon参数本构模型

采用Gleeble-3800热模拟器对Ti-6Al-7Nb合金进行了热压缩试验。在变形温度为940 ~ 1030℃、应变速率为0.001 ~ 10s^-1的条件下，研究了Ti-6Al-7Nb合金的热变形行为，并计算了合金的热变形激活能。结果表明:Ti-6Al-7Nb合金的流变应力随变形温度的升高而减小，随应变速率的增大而增大;基于峰值应力，采用Zener-Holomon参数建立了Ti-6Al-7Nb合金的Arrhenius本构模型。结果表明，该模型对峰值应力具有较高的预测精度。峰值应力预测值与实验值的Pearson相关系数r为0.96089，线性相关系数r ^2为0.91904。本研究可用于指导Ti-6Al-7Nb合金热加工工艺的制定和热变形过程的有限元模拟。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2020 3rd International Conference on Advanced Electronic Materials, Computers and Software Engineering (AEMCSE)

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