Research on Constitutive model of GH2132 superalloy and cross wedge rolled part with large section shrinkage
The isothermal compression experiment with constant strain rate of GH2132 superalloy was conducted by using Gleeble-3800 thermal simulator.The true stress-true strain curves of GH2132 superalloy in the deformation temperature range of 900 ℃ to 1 100 ℃ and strain rates of 0.01 to 10 s-1 were achieved.After correcting for friction and adiabatic effects on the flow stress curve to eliminate the influence of adiabatic temperature rise and contact friction between the anvil and the specimen on the experimental results,an Arrhenius-type constitutive model considering incorporating strain compensation was proposed.Error analysis results indicated that the relative average absolute error was less than 7%.So,the model was suitable for investigating the hot deformation behavior of the alloy at the elevated temperature.The forming process of GH2132 alloy cross wedge rolled pieces with large section shrinkage was simulated and analyzed.The accuracy of the proposed constitutive model was verified,and such a model can be used for developing the GH2132 superalloy cross wedge rolling process.