Study of flow stress model of the nickel-based superalloy GH4169 at high temperature deformation

Isothermal compression test for a nickel-based superalloy GH4169 has been carried out at a Thermecmaster-Z simulator. According the analysis of experimental results, the peak stress and steady stress significantly decreased with increasing of the deformation temperature and decreasing of the strain rate, and the deformation temperature would also affect the critical value of strain to reach the steady flow at the high temperature deformation. Meanwhile, a model for flow stress of the alloy at high temperature deformation has been established in terms of the fuzzy artificial neural network. The maximum difference between the calculated and the experimental results is 10.18%, the average difference is 2.11%. The calculated precision is better than that through the regression method.