Fluid reaction surfaces (i.e. – impellers) – Specific blade structure – Coating – specific composition or characteristic
Patent
1988-11-10
1990-05-01
Powell, Jr., Everette A.
Fluid reaction surfaces (i.e., impellers)
Specific blade structure
Coating, specific composition or characteristic
416219R, 2988971, 148 115N, F01D 528
Patent
active
049214055
ABSTRACT:
A single crystal turbine blade has a portion of its attachment section layered with a fine grained, poly-crystalline alloy. The blade is prepared by casting a single crystal body with an undersized attachment section, and then layering the attachment section with the poly-crystalline 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.
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Allied-Signal Inc.
Linne R. Steven
McFarland James W.
Powell Jr. Everette A.
Walsh Robert A.
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