TC4钛合金薄壁高筋构件近等温锻造技术研究

The near isothermal forging process of TC4 alloy component with thin wall and high rib was introduced,the geometry size and structure of forgings die were properly designed and the forging processes of components in the preformed blank scheme under closed-die and open-die molding and rod billet forging scheme with different lengths were analysed through finite element analysis by using Deform-3D, so as to properly determine the forging parameters. Based on the near isothermal forging process, the high quality TC4 alloy components were precisely formed with the method of multi-heating and incremental deformation. The microstructures analysis shows that both the primary equiaxed α phase and plate-like β phase exist in the forgings, and the grain size is relatively homogeneous. The elongation of forgings after near isothermal forging decreases slightly compared to the initial billets, while the yield strength does not change obviously, and the ultimate tensile strength and Young's modulus increase slightly, exhibiting good mechanical properties.