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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    No. 5    October 2007

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Effect of temperature on vacuum hot bulge forming of BT20 titanium alloy cylindrical workpiece
WANG Ming-wei(王明伟)1, 2, ZHANG Li-wen(张立文)1, 2, PEI Ji-bin(裴继斌)1, 2, LI Chen-hui(李辰辉)3, ZHANG Fan-yun(张凡云)3

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

ISSN 1672-7029
CN 43-1423/U

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