Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Reexamination Certificate
2006-01-25
2009-06-30
Sheehan, John P. (Department: 1793)
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
Reexamination Certificate
active
07553384
ABSTRACT:
A method for locally heat-treating a gas turbine engine superalloy article to improve resistance to strain-induced fatigue of the article is disclosed. The method comprises providing a gas turbine engine superalloy article having a gamma prime solvus temperature; and locally over aging only a selected portion of the article to locally improve fatigue resistance at the selected portion of the article, wherein the local over age cycle includes heating at about 843° C. for about 3 to 4 hours.
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Superalloy. Dictionary.com. Dictionary.com Unabridged (v 1.1). Random House, Inc. http://dictionary.reference.com/browse/superalloy (accessed: Jul. 10, 2008).
ASM International, Materials Park, Ohio, ASM Specialty Handbook: Nickel, Cobalt, and Their Alloys, “Heat Treating of Nickel Alloys”, pp. 230-234, Dec. 2000.
Andes William Scott
General Electric Company
Louke Marcella R.
Roe Jessee R.
Sheehan John P.
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