Fred P Cone

52230538, Jun 29, 1993

Jan 27, 1992

7/828542

Fred P. Cone - Jupiter FL
John A. Miller - Jupiter FL
Brendan J. Cryns - Shorewood WI
Robert Zanoni - Milwaukee WI

United Technologies Corporation - Hartford CT

C21D 800

148624

A process for strengthening heavy, thick-section forgings of precipitation age hardenable iron base superalloys. The process includes initial recrystallization to achieve a uniform grain size, intermediate temperature warm working at controlled strain rates and for limited amounts of deformation, and precipitation heat treating. The controlled warm working conditions avoid further recrystallization, thus preserving the strain hardening which improves the mechanical properties.

55340857, Jul 9, 1996

Apr 26, 1994

8/233789

Fred P. Cone - Jupiter FL
Stephen V. Prece - Palm Beach Gardens FL
Donn A. Best - Alta Loma CA

United Technologies Corporation - Hartford CT

C22C 3852
C22C 3000
C21D 800

148336

A method of treating low-expansion Fe--Ni--Co superalloys is disclosed in which the alloys are forged at a temperature below the recrystallization temperature and then recrystallized without the use of intervening annealing steps. It is necessary that the warm forging step introduce sufficient strain throughout the Fe--Ni--Co superalloy such that after recrystallizing, the superalloy has a substantially uniform microstructure. Alloys produced by this method exhibit good hydrogen charging embrittlement resistance, good strength and/or rupture ductility in moist air.