Abstract:
The hot deformation behavior of nickel-based precision resistance alloy was systematically studied through hot compression tests over a temperature range of 800-1100 ℃ and strain rates ranging from 0.01 s
-1 to 10 s
-1. Flow stress curves were plotted and analyzed based on the experimental data, considering and subsequently correcting for the effect of adiabatic temperature rise. A constitutive equation for the alloy was then established using the corrected flow stress data. The dynamic material model (DMM) was employed to develop the hot processing map of the alloy, while microstructural observations under varying deformation conditions were used to elucidate the evolution of microstructural features. The results indicate that the flow stress curves exhibit typical characteristics of dynamic recrystallization. After correction for the adiabatic temperature rise at high strain rates, the flow stress values show a noticeable increase. The activation energy for hot deformation within the temperature range of 800-1100 ℃ is determined to be 332.315 kJ·mol
-1. By analyzing the hot processing map in conjunction with the corresponding microstructural observations, the optimal hot working parameters for the alloy are identified as 1060-1100 ℃ with strain rate of 0.01 s
-1 to 0.06 s
-1.