Research on the Constitutive Mathematical Model of Ti60 Titanium Alloy and Isothermal Forging Forming Simulation

Abstract

To optimize the isothermal β forging process of Ti60 titanium alloy ring disk parts, this study focuses on the alloy ring-disk as the research subject. Using JMatPro software, the flow stress curves and thermophysical parameters under temperatures of 1000-1200°C and strain rates of 0.001-0.1 s-1 were calculated, and a flow stress constitutive mathematical model was fitted. Based on DEFORM-3D finite element software, the forging die and blank of the ring-disk were designed, and the isothermal forging process under deformation temperatures of 1060-1120℃ and strain rates of 0.001-0.01 s-1 was simulated. The effects of deformation conditions on effective strain, equivalent stress, and forming load were analyzed. The results indicate that the flow stress of Ti60 titanium alloy decreases with increasing deformation temperature and decreasing strain rate. During deformation, strain initially concentrates in the die contact area and later expands toward the center, with the load rapidly increasing in the final stage of forming. Lower strain rates (0.001 s-1) and higher deformation temperatures (1120℃) reduce material deformation resistance, promote more uniform stress distribution, and improve the forming quality of the forging. This study provides numerical simulation references for the thermal working process formulation of Ti60 titanium alloy ring disk parts.