Hot Deformation Constitutive Equation of Spray Formed Superalloy GH742y

Isothermal compression of spray formed superalloy GH742y has been conducted on Gleebe^-1500D hot simulation at the deformation temperatures ranging from 930°C to 1020°C where the strain rates have ranged from 0.01s^-1 to 10s^-1, and the height reduction of 50%. The effect of deformation temperatures and strain rates on the flow stress was analyzed with the true stress-true strain curve, and the hot deformation constitutive equation of superalloy GH742y was established using Arrhenius type hyperbolic sine equations. Error analysis shown that the established constitutive equations were coincident with experimental data well, and it provided the theory basis to make forging technology of superalloy GH742y.