HIP + ITF of SS-PREP® Superalloy Powder

The HIP (Hot Isostatic Pressing) + ITF (IsoThermal Forging) process was carried out for SS-PREP® (Super Speed Plasma Rotating Electrode Process) powder of nickel-based superalloy FGH4097. Powder made via SS-PREP® shows fine and uniform particle size, high sphericity and purity. The HIPed compact has good hot workability during isothermal forging to obtain refined grains. The heat treatment tests were performed at different solution temperatures, and mechanical properties were measured. Compared with the established as-HIP process, SS-PREP®+ HIP + ITF with 1180 °C solution heat treatment resulted in higher strength, ductility, and low cycle fatigue (LCF) life, with acceptable increase in accumulated creep strain.