Transactions of Nonferrous Metals Society of China
JOURNAL OF RAILWAY SCIENCE AND ENGINEERING
|Vol. 17 No. 5 October 2007|
（1. State Key Laboratory for Materials Modification by Laser, Ion and Electron Beams, Dalian University of Technology, Dalian 116085, China;2. School of Materials Science and Engineering, Dalian University of Technology, Dalian 116085, China; 3. Shenyang Liming Aero-Engine Group Corporation, Shenyang 110043, China）
Abstract:Temperature is one of the key parameters for BT20 titanium alloy cylindrical workpiece manufactured by vacuum hot bulge forming. A two-dimensional nonlinear thermo-mechanical coupled FE model was established. Numerical simulation of vacuum hot bulge forming process of titanium alloy cylindrical workpiece was carried out using FE analysis software MSC Marc. The effects of temperature on vacuum hot bulge forming of BT20 titanium alloy cylindrical workpiece were analyzed by numerical simulation. The simulated results show that the Y-direction displacement and the equivalent plastic strain of the workpiece increase with increasing bulge temperature. The residual stress decreases with increasing bulge temperature. The optimal temperature range of BT20 titanium alloy during vacuum hot bulge forming is 750−850 ℃. The corresponding experiments were carried out. The simulated results agreed well with the experimental results.
Key words: BT20 titanium alloy; vacuum hot bulge forming; temperature effects; numerical simulation