Modeling of flow stress of spray-forming FGH95 superalloy under hot compression

摘要

The hot compressive deformation behavior of the superalloy was investigated at the temperature range from 1050 to 1140°C and strain rate range from 0.01 to 10s~(-1) on Gleeble-1500 thermal simulator. Utilizing hyperbolic sine function and introducing the strain with 4th order polynomial fitting, the constitutive equations of flow stress of spray-forming FGH95 superalloy at high temperature were established. The results show that during the hot compression deformation of the superalloy, the characteristics of dynamic softening were observed, and flow stresses decrease with increasing temperature and decreasing strain rate. The flow stress of the superalloy predicted by the proposed models with 4th order polynomial fit agree with the experimental value well, and the average relative error is 3.64%.