Transactions of Materials and Heat Treatment

Title：Deformation behavior of titanium alloy thin-walled bent tube during hot gas bulging process

Authors： Fu Kunning1 Yang Xiaoke2 Yang Bo3 Zheng Kailun4

Unit： 1. School of Materials Science and Engineering Harbin Institute of Technology 2. Aerospace Hiwing (Harbin) Titanium Industry Co. Ltd. The Third Academy of China CASIC 3. Shenyang Liming Aero-engine Co. Ltd.AECC 4. School of Mechanical Engineering Dalian University of Technology

KeyWords： titanium alloy tube hot gas bulging strain hardening strain rate hardening deformation uniformity

ClassificationCode：TG394

year,vol(issue):pagenumber：2023,48(5):123-129

Abstract：

For the forming defects of inner wrinkling, outer cracking, sectional distortion and bending springback of TC4 titanium alloy thin-walled bent tube during bending process, the hot gas bulging process of titanium alloy thin-walled bent tube was proposed and the above forming defects were solved. The wall thickness uniformity of thin-walled bent tube was improved by adjusting the process parameters to control the cooperative regulation of strain and strain rate hardening for TC4 titanium alloy. Based on the above theory, the hot gas bulging experiment of TC4 titanium alloy thin-walled bent tube was carried out. Finally, the TC4 titanium alloy thin-walled bent tube of Φ206 mm×1.5 mm×R495 mm which met the product use requirements was formed with the maximum out-of-roundness of 0.25% and the maximum thinning rate of 16.88%. The results show that during the hot gas bulging process of TC4 titanium alloy thin-walled bent tube, the forming accuracy and wall thickness uniformity of thin-walled bent tube can be improved by controlling the main process parameters such as forming temperature and strain rate to significantly improve the product quality of formed bent tube.

Funds：

国家自然科学基金资助项目（5200052525）

作者简介：付坤宁（1991-），男，博士研究生,E-mail：19b909110@stu.hit.edu.cn;通信作者：郑凯伦（1988-），男，博士，教授,E-mail：zhengkailun@dlut.edu.cn

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