Gerald F Mathey from Glastonbury, CT, age 72

Gerald Mathey Phones & Addresses

Name / Title

Company / Classification

Phones & Addresses

Gerald F Mathey

OLD CRACKER GUNSMITH LLC

611 SW Camden Ave, Stuart, FL 34994

Method Of Making Superalloy Turbine Disks Having Graded Coarse And Fine Grains
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US Patent:

53124979, May 17, 1994
Filed:

Dec 31, 1991
Appl. No.:

7/816370
Inventors:

Gerald F. Mathey - Jupiter FL
Assignee:

United Technologies Corporation - Hartford CT
International Classification:

C22C 1900
US Classification:

148675
Abstract:

A method and apparatus for heat-treating nickel base superalloy articles to provide different properties in different regions of the article. An initially fine grain microstructure is heated such that a portion of the article is held above the. gamma. ' solvus temperature long enough to provide a coarse grain microstructure while the remainder of the article remains below the. gamma. ' solvus temperature and retains the fine grain microstructure. The coarse grain microstructure provides a reduced rate of fatigue crack growth rate while the fine grain microstructure retains good tensile properties. The invention is particularly applicable to the fabrication of turbine disks for gas turbine engines.