Metal founding – Process – Shaping liquid metal against a forming surface
Patent
1997-02-18
1998-01-13
Wyszomierski, George
Metal founding
Process
Shaping liquid metal against a forming surface
1641221, 1641222, 164516, 148555, 148562, C30B 3302, C22F 102, C22F 110, B22D 2106
Patent
active
057068810
ABSTRACT:
A method of making a single crystal or columnar grain superalloy casting comprises casting a superalloy in a mold wherein at least one of the mold and optional core comprises an oxygen-bearing ceramic, directionally solidifying the superalloy to form a single crystal or columnar grain superalloy casting, and solution heat treating the superalloy casting. The heat treatment is conducted under an atmosphere including a carbon-bearing gas, such as a carbon monoxide and inert gas mixture, wherein the carbon-bearing gas is present in an effective amount to reduce loss of carbon from the casting during the heat treatment. The heat treatment can be conducted prior to removal of all of the mold and core, if present, such as, for example, when the cast mold is in the as-knocked out condition wherein residual mold and/or core material is present on the casting. Alternately, the heat treatment can be conducted after removal of the mold and core, if present.
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Faison Julie A.
Grunstra Robert E.
Wahl Jacqueline B.
Howmet Research Corporation
Phipps Margery S.
Timmer Edward J.
Wyszomierski George
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