Hot deformation behavior of Hastelly C276 superalloy

Hot tensile behavior of C276 superalloy was studied in the deformation temperature range of 650-750 degrees C with the strain rate range of 0.35-35 mm/s. The results show that deformation temperature and strain rate both have significant influence on the flow stress. The flow stress decreases with the increase of deformation temperature, while increases with the increase of strain rate. The deformation of C276 superalloy exhibits dynamic recovery feature in the case of deformation temperature of 700 degrees C. However, when the deformation temperature increases to 750 degrees C, dynamic recrystallization behavior may occur. The flow stress of C276 alloy during hot deformation process can be characterized by Zener-Hollomon parameter including the Arrhenius term and the deformation activation energy is 327.66 kJ/mol. Therefore, a scientific basis is provided for the reasonable choice of processing parameters of C276 superalloy.