Frederick P Vaccaro

US Patent:

51203731, Jun 9, 1992

Filed:

Apr 15, 1991

Appl. No.:

7/685580

Inventors:

John A. Miller - Jupiter FL
Daniel F. Paulonis - Higganum CT
Paul D. Genereux - Cromwell CT
Jeffery W. Samuelson - Jupiter FL
Laurence A. Jackman - Monroe NC
Frederick P. Vaccaro - Waxhaw NC
William M. Thomas - Monroe NC

Assignee:

United Technologies Corporation - Hartford CT
Teledyne Industries, Inc. - Los Angeles CA

International Classification:

C22F 110

US Classification:

148564

Abstract:

A process for producing a fine grain forged superalloy article having a high yield strength at intermediate temperatures. A preferred starting composition comprises, by weight, 15% Cr, 13. 6% Co, 4. 1% Mo, 4. 6% Ti, 2. 2% Al, 0. 01% C, 0. 007% B, 0. 07% Zr, balance Ni. This material is forged at a temperature above the gamma prime solvus and at a true strain of at least 0. 5. Alternately, the material may be forged below the gamma prime solvus temperature with intermediate super solvus anneals. The overaged material is then worked at a temperature below the gamma prime solvus. The resultant fine grain material is then heat treated or can be further isothermally forged prior to heat treatment to produce complex shapes.