Optimized Design of Isothermal Forging Temperature about Nickel-base PM Super-alloy FGH96

The Chinese nickel-base powder metallurgy(PM)super-alloy FGH96 is a material hard to be deformed and isothermal forging is the best forming method to it.The die for super-alloy isothermal forging is very expensive,which works under high temperature for a long time.So forming property of FGH96 and the die strength life at that temperature must be considered to determine the optimal forge temperature.A thermomechanical coupled finite element(FE)model has been established to study the blank workpiece and forging die during the isothermal forging process.The regularity of peak equivalent stress acted on inner surface of mould,yield limit and ultimate strength of mould material during the forging process has been gained.As the peak equivalent stress acted on inner surface of mould must be extremely less than yield limit of mould material,1050℃ has been determined to be the best deformation temperature for PM super-alloy FGH96.The practice proves good effect.