Research on hot deformation behavior of GH98 superalloy under various stress conditions based on a deep learning approach

The hot deformation behavior of GH98 superalloy sheet is intricate due to the complex deformation condition. To study the deformation behavior of GH98 alloy under high temperature and complex stress states, the thermal tensile experiment with various shapes samples was carried out at temperature 800–950 °C with strain rate of 0.01 s⁻¹. The values of stress triaxiality were obtained by simulation. The hot deformation behavior of GH98 alloy under various stress states by BP and DBN-BP model was predicted. Results in this paper indicated that the designed samples included various stress states and meet the requirement. The tensile experiment suggested that the shear resistance of the GH98 alloy was weaker than the tensile resistance and the elongation increases and tensile force decreases with the increase of temperature. Compared with the BP model, the DBN-BP model performed better in predicting the high temperature deformation behavior of GH98 alloy.