锻压技术

Ti-5Al-5Mo-5V-1Cr-1Fe钛合金的高温流变行为与热加工图研究

英文标题：Research on high temperature rheological behavior and hot processing map for Ti-5Al-5Mo-5V-1Cr-1Fe titanium alloy

作者：丁蓉蓉周杰李鑫张建生卢顺

关键词：Ti-5Al-5Mo-5V-1Cr-1Fe钛合金流变行为流变应力本构方程热加工图

分类号：TG146.2+3

出版年,卷(期):页码：2019,44(3):133-139

摘要：

通过Gleeble-3500热模拟试验机对温度范围为750~950 ℃、应变速率范围为0.01~10 s-1的多组Ti-5Al-5Mo-5V-1Cr-1Fe合金试样进行热压缩试验，利用得到的真应力-真应变曲线求解材料参数，建立了基于Arrhenius模型的本构方程, 通过将所求本构方程计算出的流变应力与实测应力-应变曲线进行对比，验证了该方程的准确性；进而基于动态材料模型的加工图理论，分别绘制出应变为0.1，0.3，0.5和0.7时Ti-5Al-5Mo-5V-1Cr-1Fe钛合金的热加工图。结果显示：随着应变的增大，流变失稳区向中低温高应变速率区集中；在较小的应变量（0.1~0.3）时，安全区主要集中在中温低应变速率区（840~900 ℃, ＜0.4 s-1）和高温高应变速率区（910~950 ℃, ＞1 s-1）；在较大应变量（0.3~0.7）时，安全区主要集中在低应变速率区（780~950 ℃, ＜0.3 s-1）和高温高应变速率区（910~950 ℃, ＞1 s-1）。因此，Ti-5Al-5Mo-5V-1Cr-1Fe钛合金高温变形时的安全热加工区域为：中温(840~900 ℃)低应变速率(0.01~0.3 s-1) 区。

Hot compression tests of Ti-5Al-5Mo-5V-1Cr-1Fe titanium alloy samples with temperature 750-950 ℃ and strain rate 0.01-10 s-1 were carried out by Gleeble-3500 thermal simulator, and the constitutive equation based on Arrhhenius model was established by material parameters obtained from true stress-strain curve.Then, the accuracy of the equation was verified by comparing the calculated rheological stress with the measured stress-strain curve. Based on the machining graph theory of dynamic material model, the hot processing maps of Ti-5Al-5Mo-5V-1Cr-1Fe titanium alloy with strains of 0.1, 0.3, 0.5 and 0.7 were constructed respectively. The results show that with the increase of strain, the region of rheological instability is concentrated in the region of medium-low temperature and high strain rate. When the strain is small (0.1-0.3), the safety zone is mainly concentrated in the low strain rate zone at medium temperature(840-900 ℃，< 0.4 s-1) and the high strain rate zone at high temperature (910-950 ℃，>1 s-1). When the strain is large (0.3-0.7), the safety zone is mainly concentrated in the low strain rate zone (780-950 ℃，<0.3 s-1) and the high strain rate zone at high temperature (910-950 ℃，>1 s-1). Therefore, the safe hot working area of Ti-5Al-5Mo-5V-1Cr-1Fe titanium alloy during high temperature deformation is medium temperature (840-900 ℃) and low strain rate (0.01-0.3 s-1).

基金项目：

国家自然科学基金面上项目（51575067）；重庆市基础与前沿研究计划项目（cstc2015jcyjA70011）

丁蓉蓉(1993-)，女，硕士研究生，E-mail：dingrongrongcqu@163.com；通讯作者：周杰（1965-），男，博士，博士生导师，教授，E-mail：zhoujie@cqu.edu.cn

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