Processing Map of 2099 Alloy Deformed at High Temperature

A processing map based on dynamic material modeling of 2099 alloy was investigated by isothermal compression tests on a Gleeble-1500 machine. Microstructure characteristics of safety areas and instability areas in the temperature range of 300 similar to 500 degrees C, strain rate of 0.001 similar to 10 s(-1) of 2099 alloy were analyzed. And the optimized processing parameters were also proposed. Results show that the instability areas of 2099 mainly locate in the regions of 300 similar to 420 degrees C, 0.001 similar to 0.02 s(-1) and 300 similar to 500 degrees C, 0.562 similar to 10 s(-1). Microstructure in the instability areas displays local plastic deformation, local adiabatic shear and local plastic deformation + local adiabatic shear. The main deformation mechanisms in safety areas are dynamic recovery and dynamic recovery + dynamic recrystallization. The optimized processing parameters can be summarized as that when the true strain is less than 1.1, the processing parameters are 380 similar to 420 degrees C and 0.025 similar to 1 s(-1); when the true strain is over 3.4, the processing parameters are 420 similar to 500 degrees C, 0.001 similar to 0.562 s(-1).