Abstract：In order to study the superplastic forming/diffusion bonding (SPF/DB) process of TC31 titanium alloy four-sheet air rudder, the high temperature tensile test, finite element simulation and air rudder experiment were conducted. The results indicated that the optimal deformation strain rate of TC31 titanium alloy at 920℃ was 0.001s–1, and the maximum elongation rate was 639%, which showed good superplastic ability. The ABAQUS simulation results showed that the maximum thinning occurred at the edge of the preset block, the maximum thinning rate was 67.5%, and the maximum strain of core plate was 1.04. The four-sheet TC31 SPF/DB air rudder part with no surface depression was prepared by experiment with 0.2MPa back pressure and step pressure loading method applied. The interface quality of core plate diffusion bonding was good under the diffusion parameters of 920℃/3MPa/2h, and the welding rate was 97%.
2021, 
