METHOD OF MAKING SUPERALLOY TURBINE DISKS HAVING GRADED COARSE AND FINE GRAINS
Assignee
UNITED TECHNOLOGIES CORPORATION
Filed
Dec 31, 1991
Granted
May 17, 1994
Location
JUPITER FL US
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 γ' solvus temperature long enough to provide a coarse grain microstructure while the remainder of the article remains below the γ' 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.
Source: Google Patents
35 USC §181 Secrecy Order
Imposed
Sep 4, 1992
Rescinded
Nov 10, 1992
Duration
2 months
Inventor
- 1GERALD F. MATHEY
Record Details
- Patent number
- US 5312497
- Application
- 00781637
- Aerospace match
- Yes
- Dataset source
- 35 USC §181 SO records
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