Ti60/TA15合金四层结构舵面超塑成形/扩散连接技术研究

Research on Superplastic Forming/Diffusion Bonding for Four-Sheet Structure Rudder of Ti60/TA15 Alloy

采用有限元软件对芯板的超塑成形过程进行了分析,获得了壁厚分布规律曲线和气压加载p–t曲线。在温度为920℃时,制得Ti60/TA15四层结构舵面样件,并对舵面进行了壁厚分析。结果显示,最小壁厚为1.24mm,最大壁厚为1.80mm。采用三维扫描对Ti60/TA15合金四层结构舵面的型面进行分析。结果表明,90%以上型面的公差在±0.2mm以内,整体型面的公差不超过±0.5mm。对扩散连接界面进行了金相分析。得出在温度为920℃时,TA15同种材料之间以及Ti60/TA15异种材料之间的扩散连接界面基本消失,3种扩散连接界面处已经看不出空洞。

The superplastic forming process of the core was simulated by using the finite element software, to obtain the thickness distribution and the pressure-time curves. The four-sheet structure rudder of Ti60/TA15 alloy was obtained at 920℃. The thickness of the rudder was investigated. The results show that the minimum thickness is 1.24 mm and the maximum thickness is 1.80 mm. The moulding surface for the four-sheet structure rudder of Ti60/TA15 alloy was measured by using the 3D scanning. The results show that the tolerance of more than 90% is less than ±0.2 mm, and the global is less than ±0.5 mm. The interface of diffusion bonding was investigated by the metallograph observation. The results show that at 920℃, interfaces of diffusion bonding between the same materials of TA15 and between the different materials of TA15 disappear basically, and no holes can be seen at the three diffused interfaces.