Effect of hot working on the microstructure and tensile properties of a novel PM Re-bearing nickel base superalloy

The work is devoted to study of an experimental PM nickel-based superalloy Ni-16(Al, Ti, Nb, Ta)-30(Cr, Co, Mo, Hf, W, Re) (wt.%). initial as-HIP’ed material was prepared as cylinders with a size ?100 × 200 mm. hot workability the evaluated by compression tests small samples under isothermal conditions. were performed at temperatures 1150 –1240°C strain rate ? =10?4 –10?1 s?1. Some subjected preliminary homogenization annealing. Examination deformed SEM made it possible define working conditions providing development recrystallization processes and formation uniform fine-grained structure. It established that followed fractional forging intermediate annealings in temperature range (Ts? 40) – (Ts?15), where Ts ?' solvus temperature, provided recrystallization. obtained forgings ageing or solid solution treatment ageing. In condition heat treatment, exhibited tensile properties comparable best achievable disc superalloys.