Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Patent
1991-12-31
1994-05-17
Roy, Upendra
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
148410, 148676, 148902, C22C 1900
Patent
active
053124979
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.
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Roy Upendra
Sohl Charles E.
United Technologies Corporation
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