Simulation Of Precise Forging Of TC4 Blades Based On The Microstructure Prediction

Blade as the critical part of aero-engine, it is particularly high for its organization and performance requirements, the properties are decided by the microstructure, therefore controlling the microstructure of materials is particularly important. The TC4 alloy was regarded as the research object, extending subroutine function of DEFORM simulation software, using the DEFORM software to predict the microstructure of TC4 alloy, and the precision forging process of blade was numerical simulated, so the helpful process parameters for the actual production was obtained by simulation results analysis. Research works in this paper are summarized as follows:(1) At first, the thermal simulation compression experiment of TC4 alloy was done and the stress-strain curve and data which was get from the experiment at the deformation temperature respectively of 890℃, 910℃, 930℃, 950℃, 970 and at the ℃strain rate of 0.1s-1, 1s-1, 10s-1, 50s-1, 80s-1 and at the deformation degree of 10%, 50%, 80%. The experiment provide the data basis for building the microstructure model of TC4 alloy.(2) After the thermal simulation compression experiment of TC4 alloy then the metallographic experiment was done. It was anlysised the influence for grain size and the causes that it is at the different deformation temperature, strain rate and deformation degree. It is the basis of establishing the model, and it provides experiment comparision for the TC4 alloy microstructure numerical simulation.(3) The microstructure model is established by experimental data, and then it was embedded in the DEFORM software, and the microstructure of the subroutine was expanded, and the cylinder upsetting was simulated, then the comparison of thermal simulation compression test and simulation results show that the error is less than 9.6%, so the established microstructure model can predict the microstructure of TC4 titanium alloy.(4) The microstructure of precision forging process of TC4 alloy blade was simulated by the numerical simulation, through the numerical simulation, the evolution regularity of the blade microstructure can be get from blocking- preforging- finish forging, and through the analysis of simulation results, the deformation process parameters of TC4 alloy blade can be chosen reasonably. The process parameters respectively were that the blocking temperature was 950℃, and the pre-forging temperature was 930℃, and the finish forging temperature was 910℃; the deformation rate was 20 mm/s; it was reasonable that the friction coefficient was 0.1.