摘要
目的研究TA15/Ti2AlNb异种合金四层空心舵翼件成形/扩散连接工艺,获得合理的工艺参数,掌握塑性变形和扩散连接规律,推动异种合金轻量化中空结构件的应用。方法采用MSC.Marc有限元仿真了TA15/Ti2AlNb异种合金四层空心舵翼超塑成形/扩散连接工艺过程,根据2种材料的高温变形规律优化出气压加载曲线,开展了空心舵翼的超塑成形/扩散连接实验研究,测试了舵翼的壁厚分布,分析了焊缝的金相组织。结果成功制备了TA15芯板直立筋良好、三角区宽度仅1.1 mm的四层空心舵翼,面板最大减薄率为20.0%,芯板最大减薄率为54.2%,芯板与面板之间扩散连接区域的焊合率为46.8%~98.6%。结论超塑成形/扩散连接工艺可制造TA15/Ti2AlNb异种合金空心结构,2种合金高温流动应力的显著差别避免了表面沟槽缺陷,但当整形压力和保压时间不足时,四层结构内各处扩散连接焊合率存在不稳定性。
The work aims to study the superplastic forming/diffusion bonding(SPF/DB)bonding technology of TA15/Ti2AlNb four-layer hollow rudder,obtain the reasonable manufacturing process parameters,master the law of plastic deformation and diffusion bonding and promote the application of dissimilar alloy lightweight hollow structural parts.MSC.Marc was used to simulate the SPF/DB process of TA15/Ti2AlNb dissimilar alloy four-layer hollow rudder,the pressure curve was optimized according to the high temperature deformation law of the two materials,and the experimental study on SPF/DB of hollow rudder was carried out.The wall thickness distribution of rudder was analyzed,and the metallographic structure of the diffusion area was observed.The TA15/Ti2AlNb four-layer hollow rudder with intact vertical rib and triangle area width of 1.1 mm was prepared.The maximum thinning rate of the surface blank was 20.0%,and the maximum thinning rate of the core blank was 54.2%.The welding rate between core blank and surface blank ranged from 46.8%to 98.6%.TA15/Ti2AlNb four-layer hollow rudder can be prepared by SPF/DB,and the obvious flow stress difference between TA15 and Ti2AlNb avoids the generation of surface groove,but the welding rate in different area is unstable when the forming pressure and pressure holding time are insufficient.
作者
武永
周贤军
吴迪鹏
秦中环
李保永
陈明和
WU Yong;ZHOU Xian-jun;WU Di-peng;QIN Zhong-huan;LI Bao-yong;CHEN Ming-he(College of Mechanical and Electrical Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;Beijing Hangxing Machinery Manufacturing Co.,Ltd.,Beijing 100013,China)
出处
《精密成形工程》
北大核心
2022年第4期102-108,共7页
Journal of Netshape Forming Engineering
基金
国家自然科学基金(51805256)。
