摘要
对钛合金电辅助塑性成形工艺研究进展进行了综述,包括电辅助弯曲、电辅助镦粗和电辅助拉拔等。介绍了近期开发的TC4钛合金环段电辅助拉深成形工艺,在1500A大电流(电流密度5.5A/mm^(2))和1.5V低电压作用下,在1min内即可达到所需的600℃左右的成形温度。脉冲电流对TC4钛合金微观组织的影响比较复杂,在一定情况下促进钛合金内的β相向α相的转变,降低其热力学激活能,也可以显著降低TA15钛合金和TA1钛合金的各向异性。适当频率和密度的脉冲电流可修复细小裂纹、韧窝、孔洞等。钛合金的电致塑性主要包括焦耳热效应和纯电塑性效应,现有的研究结果对纯电塑性效应还没有形成一致的结论,对今后的研究方向也进行了阐述。
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/mm^(2))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 ofβphase toαphase 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.
作者
李细锋
曹旭东
王斌
孔得力
兰晓宸
LI Xifeng;CAO Xudong;WANG Bin;KONG Deli;LAN Xiaochen(Shanghai Jiao Tong University,Shanghai 200030,China;Beijing Xinghang Electro-Mechanical Equipment Co.,Ltd.,Beijing 100074,China;The Sixth Representative Office in Beijing of Rocket Force,Beijing 100074,China;The Second Representative Office in Beijing of Air Force,Beijing 100074,China)
出处
《航空制造技术》
CSCD
北大核心
2021年第17期22-30,共9页
Aeronautical Manufacturing Technology
基金
NSFC-辽宁联合基金项目(U1908229)。
关键词
钛合金
电致塑性
塑性变形
微观组织
焦耳热
纯电塑性效应
Titanium alloys
Electroplasticity
Plastic deformation
Microstructure
Joule heating
Pure electroplastic effect
