TA15钛合金薄壁焊接件热处理校形研究<sup>*</sup>

doi:10.11900/0412.1961.2015.00314

金属学报

2016, Vol. 52

Issue (3): 281-288 DOI: 10.11900/0412.1961.2015.00314

论文

本期目录 | 过刊浏览

TA15钛合金薄壁焊接件热处理校形研究^*

李永奎¹,权纯逸²,陆善平¹(

),焦清洋²,李世键²,孙忠海²

1) 中国科学院金属研究所沈阳材料科学国家(联合)实验室, 沈阳 110016
2) 中航工业沈阳飞机工业(集团)有限公司, 沈阳 110034

STUDY ON SHAPE CORRECTION OF THE THIN PLATE OF TA15 TITANIUM ALLOY BY POST WELD HEAT TREATMENT

Yongkui LI¹,Chunyi QUAN²,Shanping LU¹(

),Qingyang JIAO²,Shijian LI²,Zhonghai SUN²

1 Shenyang National Laboratory of Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2 AVIC Shenyang Aircraft Corporation, Shenyang 110034, China

引用本文:

李永奎, 权纯逸, 陆善平, 焦清洋, 李世键, 孙忠海. TA15钛合金薄壁焊接件热处理校形研究^*[J]. 金属学报, 2016, 52(3): 281-288.
Yongkui LI, Chunyi QUAN, Shanping LU, Qingyang JIAO, Shijian LI, Zhonghai SUN. STUDY ON SHAPE CORRECTION OF THE THIN PLATE OF TA15 TITANIUM ALLOY BY POST WELD HEAT TREATMENT[J]. Acta Metall Sin, 2016, 52(3): 281-288.

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摘要:

针对飞机关键薄壁件焊接过程中产生的"簸箕"变形问题, 采用有限元结合实验验证的方法进行了焊接变形及焊后热处理校形的研究. 通过实验获得了材料的基础物性及高温蠕变行为, 验证了焊接及焊后热处理有限元模型. 利用可靠的热处理有限元模型进行了热处理工艺优化. 结果表明, 筋条焊后开槽导致沿筋条方向的应力释放及筋条-长衍焊点是导致"簸箕"变形的主要原因; 升高温度,增加载荷及延长保温时间能够改善热处理校形的效果, 并据此制定了面向工程应用的TA15钛合金薄壁构件的热处理工艺图.

关键词 ： TA15钛合金薄壁件, 焊接变形, 焊后热处理, 有限元模拟

Abstract：

Weld deformation of the thin-wall weldment used in fighter aircraft not only hinders its subsequent procedure of fabrication and assembling, but also reduces its fatigue strength. As a result, weld deformation shortens its service life essentially. Dustpan deformation is always produced in the thin-wall weldment after multiple-pass weld. In this work, combining with the experiment, the finite element method was adopted to analysis the deformation of the thin-wall weldment by multiple-pass weld and its shape correction by post weld heat treatment. For obtaining the fundamental properties such as thermal parameters and mechanical parameters of TA15 titanium alloy, a series of experiments were conducted at room temperature and high temperatures. Additionally, creep behaviors of TA15 titanium alloy were studied at the temperatures of 500, 550, 600, 650, 700 and 750 ℃, and the parameters of creep constitutive equations of the alloy were obtained with considering the analysis of post weld heat treatment. A thermal coupled temperature-displacement analysis for welding and post weld heat treatment was performed on a three dimensional shell model of protective grille. Experiments of multiple-pass weld and post weld heat treatment were used to testify the reliability of the finite element model of welding and post weld heat treatment. With using the reliable finite element model, the parameters of heat treatment were studied. The study indicates that, the fabrication on the crossing of structure section and fillet after fillet-wallboard weld leads the compression deformation release along the fillet, after that, the shrinkage distortion produced during spot welding of fillet-structural section mainly contributes the large dustpan deformation of the thin-wall weldment; increasing temperatures, enlarging loads and prolonging the hold time can improve the shape correction of the thin-wall weldment during post weld heat treatment, hence the guide maps of the post weld heat treatment for shape correction of the thin-wall weldment under 700 and 750 ℃ are worked out.

Key words： thin-wall part of TA15 titanium alloy weld deformation post weld heat treatment finite element method

收稿日期: 2015-06-15

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https://www.ams.org.cn/CN/10.11900/0412.1961.2015.00314 或 https://www.ams.org.cn/CN/Y2016/V52/I3/281

图1 TA15钛合金的热物性参数

图2 TA15钛合金的塑性本构关系

图3 TA15钛合金高温蠕变行为

表1 600~750 ℃下TA15钛合金的蠕变参数

图4 TA15钛合金高温蠕变松弛本构关系

图5 复杂薄壁件宏观示意图

表2 复杂薄壁件焊接工艺参数

图6 飞机复杂薄壁件焊接变形模拟结果

图7 焊后复杂薄壁件不同截面变形

图8 热处理校形模拟结果

图9 不同热处理温度下保温时间对复杂薄壁件校形的影响

图10 750 ℃下压板厚度对复杂薄壁件校形的影响

图11 热处理保温2 h 下温度对复杂薄壁件校形的影响

图12 TA15 钛合金复杂薄壁件焊后700 和750 ℃热处理工艺图

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