Analytical modeling of the microstructure evolution of titanium alloys during high-speed stamping of the blades of gas-turbine engines

The analysis procedure of the microstructure evolution during intense deformation is developed and approved by the example of high-speed stamping (HSS) of GTE blades made of VT9 titanium alloy based on an analytical model of dynamic recrystallization. Model coefficients were calculated by the results of a measurement of grain sizes during preliminary experiments on the high-speed upsetting of cylindrical samples made of VT9 alloy. The microstructure was investigated experimentally after the HSS of blades made of VT9 alloy using a VSM4 hammer with the motion velocity of falling parts in the beginning of deformation at 30 m/s. The microstructure evolution of the deformed medium is modeled analytically (by the sizes of the alpha phase), allowing for the variation in texture along main deformation directions with an error reaching 10%.