B - Operations – Transporting – 22 – D
Patent
B - Operations, Transporting
22
D
22/166
B22D 27/02 (2006.01) B22D 27/04 (2006.01) B22D 27/08 (2006.01) B22D 27/20 (2006.01) C30B 11/00 (2006.01)
Patent
CA 1230732
ABSTRACT OF THE DISCLOSURE This is a process of fabricating turbine blades for combustion turbines. It is an improvement to the type of process where a mold containing molten metal is cooled in a controlled fashion such that solidification occurs slow enough to allow single crystal growth beginning at the airfoil end. In the improved process solidification is monitored and magnetic mixing of the remaining molten metal is started at approximately the beginning of solidification of said root section and at approximately the same time the rate of cooling of said blade is increased to a rate faster than at which single crystal growth occurs. Grain boundary strengthener (preferably carbon) can be added at approxi- mately the same time mixing is begun. A blade is produced with a single crystal airfoil section and a fine grained root section and without a substantially inhomogeneous portion at the interface between the airfoil and root sections.
485253
Beck Cyril G.
Burke Michael A.
Oldham And Company
Westinghouse Electric Corporation
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