B - Operations – Transporting – 22 – D
Patent
B - Operations, Transporting
22
D
22/173
B22D 27/02 (2006.01) B22D 27/04 (2006.01)
Patent
CA 1229717
ABSTRACT OF THE DISCLOSURE This is a process of fabricating directionally solidified turbine blades for combustion turbines. It is an improvement to the type of process where a mold con- taining molten metal is cooled in a controlled fashion such that solidification occurs slow enough to allow directional solidification 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 the rate of cooling of said blade is increased to a rate faster than at which directional solidification occurs. A blade is produced with a direc- tionally solidified airfoil section and a fine grained root section and without a substantially inhomogeneous portion at the interface between the airfoil and root sections.
481803
Oldham And Company
Westinghouse Electric Corporation
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