Method for production of combustion turbine blade having a singl

Details Method for production of combustion turbine blade having a singl Method for production of combustion turbine blade having a singl

1984-08-27

1987-01-20

Godici, Nicholas P.

Metal founding

Process

Shaping liquid metal against a forming surface

164499, B22D 2702

Patent

active

046374485

ABSTRACT:
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 approximately 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.

REFERENCES:
patent: 3494709 (1970-02-01), Pieurcey
patent: 3695941 (1972-10-01), Green et al.
patent: 3790303 (1974-02-01), Endres
patent: 3981345 (1976-09-01), Alberny et al.
patent: 4307769 (1981-12-01), Hauser et al.
ASM, Metals Handbook; Atlas of Microstructure of Industrial Alloys; 8th ed.

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