Alloys or metallic compositions – Nickel base – Chromium containing
Patent
1985-05-10
1994-07-12
Walsh, Donald P.
Alloys or metallic compositions
Nickel base
Chromium containing
148410, 148675, C22C 1905
Patent
active
053286596
ABSTRACT:
Nickel base superalloy articles, especially gas turbine disks, are provided with substantially enhanced resistance to crack growth through a specific heat treatment. The heat treatment employs a true solution treatment step followed by a subsolvus solution treatment step, followed by at least one aging step. The effect of this series of heat treatment steps is to provide a microstructure having an optimum arrangement of gamma prime particles, with respect to both size and location. Reductions in crack growth rates of several hundred percent relative to prior art heat treatments are achieved.
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Cox Arthur R.
Robertson John M.
Tillman Thomas D.
Mai Ngoclan T.
Sohl Chalres E.
United Technologies Corporation
Walsh Donald P.
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