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| Ti2AlNb 合金蜂窝结构电流辅助成形-扩散连接工艺研究 |
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丁 锐1,2, 邱伟真3, 赵 杰1,4, 王东君1,4, 刘 钢1,4
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1. 哈尔滨工业大学材料科学与工程学院，哈尔滨 150001;2. 哈尔滨工业大学金属精密热加工 4. 航天海鹰（哈尔滨）钛业有限公司精密塑性成型中心，哈尔滨 150028
国家级重点实验室，哈尔滨 150001;3. 西安航天发动机有限公司，西安 710100;4.2. 哈尔滨工业大学金属精密热加工
国家级重点实验室，哈尔滨 150001
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| 摘要: |
| Ti2AlNb 合金蜂窝结构采用辊弯-热校形-点焊复合工艺制备，存在工艺周期长、能耗高、构件精度低、
可靠性差等缺陷。本文提出 Ti2AlNb 合金蜂窝瓦楞板电流辅助辊压成形工艺，利用局部成形位置的高电流密度抑
制构件回弹。同时，采用扩散连接工艺制备蜂窝结构，实现蜂窝结构的可靠连接。当电流密度高于阈值（20 A/mm
2）
时，电流密度对于 V 形弯曲回弹的抑制作用显著。当电流密度达到 60 A/mm
2 时，V 形弯曲回弹已基本消除。在
瓦楞板电流辅助辊压成形过程中，当最大电流密度增大至 66 A/mm
2时，瓦楞板的成形角度由 125.5°降低为 121.3°。
设计了 Ti2AlNb 蜂窝结构扩散连接工装，在 970 ℃/15 MPa/2 h 热压工艺参数下，制备了蜂窝结构样件，六边形
元胞的尺寸一致、精度高。 |
| 关键词: Ti2AlNb 合金 蜂窝结构 电流辅助 辊压成形 扩散连接 |
| 基金项目:国家自然科学基金资助项目（522***45） |
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| Research on the Current Assisted Roll Forming of Ti2 A l N b A ll o y C o rr u g a te d S h e et |
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Ding Rui1,2,3, Qiu Weizhen4, Zhao Jie1,2, Wang Dongjun1,2, Liu Gang1,2
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1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001;2. National Key Laboratory for
Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001;3.4. Precision Plastic Forming Center, Aerospace Hiwing (Harbin) Titanium Industry Co., Ltd., Harbin 150028;4.3. Xi'an Space Engine Co., Ltd.,
Xi'an 710100
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| Abstract: |
| The honeycomb structure of Ti2AlNb alloy is prepared by the integrated process of roll bending and thermal
adjustment and spot welding, which has some defects such as long process period, high energy consumption, low
component precision and poor reliability. In this paper, the current assisted roll forming process of Ti2AlNb alloy
honeycomb corrugated sheets is proposed, and the high current density in local forming position is used to inhibit
springback defects. At the same time, the honeycomb structure is prepared by diffusion bonding technology to realize the
reliable connection of the honeycomb structure. When the current density is higher than the threshold (20 A/mm
2
), the
current density has a significant inhibitory effect on the springback of V-shaped bending. When the current density reaches
60 A/mm
2
, the springback defect is basically eliminated. When the loading current increases to 66 A/mm
2
during the current
assisted roll forming process , the forming angle of the corrugated sheet is reduced from 125.5° to 121.3°. The Ti2AlNb
honeycomb structure diffusion bonding tool was designed. The honeycomb structure sample was prepared under hot
pressing process parameters of 970 ℃/15 MPa/2 h. The size of hexagonal cell was the same and the precision was high. |
| Key words: Ti2AlNb alloy honeycomb structure current assisted roll forming diffusion bonding |
