锻压技术

基于改进Arrhenius模型的Ti55531合金跨相区本构关系

英文标题：Constitutive relationship of Ti55531 alloy in crossphase region based on improved Arrhenius model

作者：李雷

关键词：Ti55531合金热压缩试验流变应力变形热激活能 Arrhenius本构模型

分类号：TG146.2

出版年,卷(期):页码：2018,43(12):151-155

摘要：

在Gleeble-3500热模拟试验机上对Ti55531合金进行高温热压缩试验，获得了变形温度为1033~1183 K、应变速率为0.001~1 s-1和压下量为60%条件下的流变应力曲线。试验结果表明，在变形初期受到加工硬化的主导，流变应力迅速上升达到峰值，随后软化作用开始占据主导，流变应力随着应变的增加有所降低。基于Arrhenius本构方程，通过数据的计算和拟合，得到该合金在两相区和单相区的变形热激活能Q分别为280.25和183.14 kJ·mol-1。同时，考虑到变形温度T对材料参数A的影响，建立了不同相区材料参数A关于变形温度T的关系，并基于得到的不同相区的Q值和A值，建立了该材料在单相区和两相区的Arrhenius本构模型。

The hot compression tests at high temperature of Ti55531 alloy were conducted by Gleeble-3500 thermal simulation test machine, and the flow stress curves with temperatures of 1033-1183 K, strain rate of 0.001-1 s-1 and height reduction of 60% were obtained. The results show that the flow stress increases rapidly and reaches a peak value due to the predomination of workinghardening at the initial stage of deformation and decreases with the increasing of strain due to the predomination of softening effect. On the basis of Arrhenius constitutive equation, the deformation activation energies of Ti55531 alloy in dual phase region and single phase region are 280.25 and 183.14 kJ·mol-1 respectively by data calculation and fitting. Meanwhile, considering the influence of deformation temperature T on the material parameter A, the relationship between material parameter A and deformation temperature T is developed. Subsequently, on the basis of the obtained Qvalue and Avalue, the Arrhenius constitutive models in single phase region and dual phase region are constructed.

基金项目：

基金项目:重庆市教委科学技术研究项目（KJ1503105）

作者简介：李雷(1976-)，男，硕士，教授 Email：lilei1976cq@163.com

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