Dual structure turbine blade

Details Dual structure turbine blade Dual structure turbine blade

F - Mech Eng,Light,Heat,Weapons

01

D

170/84

F01D 5/28 (2006.01) F01D 5/30 (2006.01)

Patent

CA 1298207

TE-6017G DUAL STRUCTURE TURBINE BLADE ABSTRACT OF THE DISCLOSURE A single crystal turbine blade has a portion of its attachment section layered with a fine grained, polycrystalline alloy. The blade is prepared by casting a single crystal body with an undersized attachment section, and then layering the attachment section with the polycrystalline superalloy to form a composite structure. Layering is preferably accomplished by plasma spraying the body with the superalloy, and hot isostatically compacting the sprayed superalloy to minimize porosity. The composite structure is then heat treated to develop an optimized microstructure in the dual alloy attachment section. The polycrystalline material in the attachment section may be machined to a firtree shape for mounting in a turbine wheel. The resulting turbine blade has improved life resulting from reduced low cycle, low temperature fatigue susceptibility of, and crack growth in, the composite attachment section.

610083

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