Flow Stress Model of GH4169 Alloy in Hot Rolling Process

Based on the stress-strain curves of GH4169 alloy in the temperature range 950-1 100 ℃ and in the strain rate range 0.1-100.0 s-1, a flow stress model was established using Arrhenius constitutive equation and Zener-Hollomom parameter, the relation among the temperature, the strain rate, the strain and the flow stress of GH4169 alloy during isothermal constant velocity compression was simulated and analyzed with this model.Resultsshow that except for the curve of the flow instability region at 950 ℃ and 100.0 s-1, the high fitting accuracy was obtained between the measured and the calculated stress for this model at other strain rate and the deformation temperature, and the deformation characteristics of GH4169 alloy in different process parameters can be better reflected. The flow stress model constructed in this paper can be applied to the numerical simulation of hot rolling process based on finite element method.