Deformation characteristics of as-received Haynes230 nickel base superalloy

The hot deformation behavior of nickel base superalloy Haynes230 has been studied using hot compression experiments. Specimens were deformed in the temperature range of 1050-1250 °C with strain rates of 10^-3 to 10 s^-1 and total strain of above 0.7. True stress-true strain curves and deformation microstructures were studied. The results show that dynamic recrystallization is the mainly softening mechanism during the high temperature deformation of Haynes230, and it can be effectively promoted by increasing deformation temperature. When deformation temperature is higher than 1150 °C, completely recrystallized microstructures can be obtained. Dependence of peak stress on the temperature and strain rate is modeled using the hyperbolic-sine Arrhenius-type equation. The average activation energy is determined to be 404 kJ/mol.