锻压技术

TC18钛合金热压缩过程峰值应力及动态软化本构模型

英文标题：Peak stress and dynamic softening constitutive model of titanium alloy TC18 during hot compression

作者：门正兴周杰郑金辉马亚鑫唐越

分类号：TG316

出版年,卷(期):页码：2018,43(6):129-133

摘要：

为准确预测TC18钛合金热模锻成形过程中金属流动规律，在温度为868～908 ℃、应变速率为0.001～1 s- 1以及最大应变为0.7条件下，采用Gleeble-1500热模拟实验机对TC18钛合金进行等温等应变速率热压缩实验，得到材料在相变点附近的应力应变曲线；通过线性拟合方法得到TC18钛合金Arrhenius峰值应力本构模型，用于TC18钛合金热塑性变形过程中金属流动规律的宏观分析及最大载荷的预测；通过多元非线性拟合方法得到TC18钛合金加入软化因子的Fields-Backofenb本构模型，用于材料热塑性变形过程中金属流动规律的微观分析。结果表明，在实验温度及应变速率范围内，TC18钛合金Arrhenius峰值应力模型以及Fields-Backofen模型预测值均接近实验值。

In order to accurately predict the metal flow law during the hot die forging process of titanium alloy TC18, hot compression experiments with equal temperature and equal strain rate at temperature 868-908 ℃，strain rate 0.001-1 s-1 and maximum strain 0.7 were conducted by thermal simulation machine Gleeble-1500. The stress-strain curves near the transformation point of material were obtained. Then, the Arrhenius peak stress constitutive model of TC18 was obtained by linear fitting method to analyze metal flow in macro and predict the maximum forming load during thermoplastic deformation process of TC18. The Fields-Backofen constitutive model of TC18 with addition of softening factor was obtained by multivariate nonlinear fitting method to analyze metal flow in micro during the thermoplastic deformation process. The results show that the predicted values of the Arrhenius peak stress model and the Fields-Backofen model are close to the experimental values within the range of experimental temperature and strain rate.

基金项目：

国家自然科学基金面上项目(51275543) ；四川省教育厅科研资助项目 (172B0035)

门正兴（1980-），男，博士，副教授；Email：amen1980@163.com

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