Research Progress on Electrically-Assisted Plastic Forming Technology of Titanium Alloy
LI Xifeng1 , CAO Xudong1 , WANG Bin2 , KONG Deli3 , LAN Xiaochen4
(1. Shanghai Jiao Tong University, Shanghai 200030, China ; 2. Beijing Xinghang Electro-Mechanical Equipment Co., Ltd., Beijing 100074, China ; 3. The Sixth Representative Office in Beijing of Rocket Force, Beijing 100074, China ; 4. The Second Representative Office in Beijing of Air Force, Beijing 100074, China)
Abstract：The research progress of electrically-assisted plastic forming process of titanium alloys is summarized. Electrically-assisted bending, electrically-assisted upsetting and electrically-assisted drawing are included. The electricallyassisted forming process of TC4 titanium alloy ring segment has also been developed recently. Under high current of 1500A (current density of 5.5A/mm2 ) and low voltage of 1.5V, the required forming temperature of about 600℃ can be obtained within 1min. The effect of pulse current on microstructure evolution of TC4 titanium alloy is very complicated. It can promote the transformation of β phase to α phase under certain circumstances and reduce its thermodynamic activation energy, which can also significantly reduce the anisotropy of TA15 and TA1 titanium alloy. The pulse current with appropriate frequency and density can repair some small cracks, dimples, voids, etc. The electroplasticity of titanium alloy mainly includes Joule heating effect and pure electroplastic effect. The existing research results draw inconsistent conclusions about pure electroplastic effect. Future research topics are also revealed.