Superalloy forging process

US5120373A · kind A · utility

Assignees

• UNITED TECHNOLOGIES CORPORATION · US
• Teledyne Industries, Inc. · US

Inventors

• John A. Miller · North Palm Beach, US
• Daniel F. Paulonis · Higganum, US
• Paul D. Genereux · Cromwell, US
• Jeffery W. Samuelson · North Palm Beach, US
• Laurence A. Jackman · Monroe, US
• Frederick P. Vaccaro · Waxhaw, US
• William M. Thomas · Monroe, US

Key dates

• Filing date: Apr 15, 1991
• Grant date: Jun 9, 1992
• Expiry date: Apr 15, 2011

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C22F1/10
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

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.