钛合金激光焊/超塑成形接头均匀性行为及机理研究

项目名称： 钛合金激光焊/超塑成形接头均匀性行为及机理研究

项目编号： No.51465042

项目类型： 地区科学基金项目

立项/批准年度： 2015

项目学科： 机械、仪表工业

项目作者： 程东海

作者单位： 南昌航空大学

项目金额： 48万元

中文摘要： 激光焊/超塑成形技术可进一步拓宽焊接/超塑成形技术的应用范围，在航空航天等领域的轻量化结构制造中具有广泛的应用前景。现有研究表明钛合金能够采用激光焊/超塑成形技术制造三层、四层结构，但是接头处存在明显变形不均匀的问题。因此接头的组织及变形不均匀性是制约激光焊/超塑成形技术实际应用的关键问题。基于置氢可以对钛合金组织进行调整的特点，项目提出氢-热联合处理的方法，调整接头各区域组织的均匀程度，提高其变形均匀性。项目认为钛合金激光焊接接头超塑变形过程不仅包含单个区域非理想组织的等轴化过程，还有不同区域组织的耦合均匀化行为。拟通过观察不同变形量时接头各区域间的组织状态，推演接头在变形过程中各区域的组织耦合均匀化机理。并对不同变形量下的成形接头进行力学及疲劳性能测试，为激光焊/超塑成形技术制造轻量化结构提供设计依据和理论基础。项目还可以为非均匀组织的超塑性变形机理的研究提供试验基础。

中文关键词： 激光焊接；超塑成形；钛合金；置氢

英文摘要： Laser welding / superplastic forming technology, which can further expand the application range of welding / superplastic forming technology, has the widespread application prospect of lightweight structure manufacture in the field of aviation and aerospace. The current study shows that laser welding / superplastic forming can be used in manufacturing three layer, four layer titanium alloy structure, but the joint has obvious uneven deformation problems. Therefore, the microstructure and deformation inhomogeneity of joint is the key problem in application of laser welding / superplastic forming technology. Based on the the characteristics of hydrogen can be adjusted on the microstructure of titanium alloy, hydrogen - heat treatment is proposed to adjust the organization uniformity of the joint, and improve the deformation uniformity. The project suggests that the superplastic deformation process not only contains equiaxial process of a single regional non ideal tissue, but also contains the coupling of different regional tissue homogenization behavior. By observing the microstructure state among different regions at different deformation, the regional organizations coupled uniform mechanism of joint in the deformation process will be deducted. The mechanical and fatigue performance will be tested on forming joints with different deformation. This project could provide design theory basis for manufacturing of lightweight structure with laser welding / superplastic forming technology. And can also provide experimental basis for superplastic deformation mechanism study of the inhomogeneous tissue.

英文关键词： Laser welding;Superplastic deformation;Titanium alloy;Hydrogenation