The Effect of Isothermal Forging Process Parameters on the Microstructure and the Properties of TA15 Near alpha Titanium Alloy

摘要

In this paper the effect of isothermal forging process parameters on the microstructure and the mechanical properties of TA15 titanium alloy was researched. The results of the tests indicate that, in the range of temperature of 850 deg C-980 deg C and deformation degree of 20 percent -60 percent , with the increase of temperature or deformation, as the reinforcement of deformation recrystallization, the primary alpha -phase tends to the spherical shape and secondary alpha -phase transforms from the acicular shape to fine and spherical shape with disperse distribution, which enhance the tensile properties at room and high temperature. With the increment of forging times, the spheroidization of primary alpha -phase aggrandizes and secondary alpha -phase transforms from spherical and acicular shape to wide strip shape, which decrease the tensile properties at room and high temperature. The preferable isothermal forging process parameters are temperature of 980 deg C, deformation degree of 60 percent , and few forging times.