Investigations on Stress Relaxation Behavior of Ti-6Al-4V Titanium Alloy Thin Sheet

被引：2
|
作者：
Bi J. [1 ,2 ]
Cui X. [3 ]
Zhang Y. [1 ,2 ,4 ]
Zhang Z. [1 ,2 ,4 ]
Wu X. [3 ]
机构：
[1] AVIC Manufacturing Technology Institute, Beijing
[2] Aeronautical Key Laboratory for Plastic Forming Technology, AVIC Manufacturing Technology Institute, Beijing
[3] School of Mechanical Engineering and Automation, Beihang University, Beijing
[4] Beijing Key Laboratory of Digital Forming Technology and Equipment, AVIC Manufacturing Technology Institute, Beijing
来源：
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | 2019年 / 55卷 / 18期
关键词：
Creep-type constitutive model; Delay function; Relaxation resistance; Stress relaxation; Titanium alloy thin sheet;
D O I：
10.3901/JME.2019.18.043
中图分类号：
学科分类号：
摘要：
The multiple sets of stress relaxation crossover tests of the Ti-6Al-4V titanium alloy ultrathin sheet with the different temperatures (650℃, 700℃ and 750℃) and the different pre-strain (2%, 4% and 16%) are carried out. The effects of temperature and pre-strain on the stress relaxation resistance of Ti-6Al-4V titanium alloy and the stress relaxation behavior at high temperature are investigated. Based on the experimental data,the stress relaxation curve fitting of Ti-6Al-4V titanium alloy is carried out with a more accurate four-order delay function. The results of the four-time delay function prediction are in good agreement with the experimental data,and the fitting accuracy is as high as 99.724%. Based on the experimental data,the relationship between the short-term creep strain rate and stress at high temperature is further derived. Finally,based on the Arrhenius constitutive model,the high-temperature short-time creep constitutive equation of Ti-6Al-4V titanium alloy ultrathin sheet is established,which laid a foundation for subsequent hot sizing process formulation and numerical simulation. © 2019 Journal of Mechanical Engineering.
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页码：43 / 52and62
页数：5219
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