Based On Titanium Alloy Microstructure Evolution Constitutive Model And Its Application,

Titanium alloy is a structure material of metal widely used in aircraft industry. The microstructure and performance of titanium is relatively sensitive to the process parameters in the hot deformation processes, and the optimal process parameters is in relatively narrow range, and then it is in difficulty to obtain ideal microstructure and performance with the common forging technique. To study the deformation mechanism in forging process of titanium alloy plays an important role in practice.To establish the constitutive relationship is a precondition to simulate the plastic deformation during the hot plastic deformation of metals. Besides the stress and strain change of metals, microstructure undergoes a series of complicated changes. Based on the experimental results of microstructure of a TC6 alloy, influence of process parameters on microstructure evolution has been studied, the constitutive relationship based on microstructure evolution has been developed, and the material constants have been calculated with the help of evolution programming.Based on the constitutive relationship coupled microstructure evolution, 3D-FE simulation of isothermal forging process of TC6 titanium alloy disc is performed dealing with different deformation temperature, punch velocity and shear factor of friction, effect of process parameters on equivalent strain, equivalent stress and grain size is calculated, and load-displacement curve is calculated.