Isothermal forging — Pratt & Whitney

Process developed by Pratt & Whitney based on 1938 German superplasticity work (lost in WWII). Dies heated to ~1000°C, slow squeeze (10–15 min), single set of dies. 250 lb → 15 lb conventional becomes 126 lb → 15 lb isothermal.

What's isothermal forging? Isothermal forging is something that was really developed by Pratt & Whitney, based on something that was developed in 1938 in Germany but was lost because of World War II. It was published in 1938, but because of World War II, no one ever paid any attention to it. It's called superplasticity.