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Low cycle fatigue behaviour of a plasma-sprayed coating materialSingle crystal nickel-base superalloys employed in turbine blade applications are often used with a plasma spray coating for oxidation and hot corrosion resistance. These coatings may also affect fatigue life of the superalloy substrate. As part of a large program to understand the fatigue behavior of coated single crystals, fully reversed, total strain controlled fatigue tests were run on a free standing NiCoCrAlY coating alloy, PWA 276, at 0.1 Hz. Fatigue tests were conducted at 650 C, where the NiCoCrAlY alloy has modest ductility, and at 1050 C, where it is extremely ductile, showing tensile elongation in excess of 100 percent. At the lower test temperature, deformation induced disordering softened the NiCoCrAlY alloy, while at the higher test temperature cyclic hardening was observed which was linked to gradual coarsening of the two phase microstructure. Fatigue life of the NiCoCrAlY alloy was significantly longer at the higher temperature. Further, the life of the NiCoCrAlY alloy exceeds that of coated, /001/-oriented PWA 1480 single crystals at 1050 C but at 650 C the life of the coated crystal is greater than that of the NiCoCrAlY alloy on a total strain basis.
Document ID
19870036766
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Gayda, J.
(NASA Lewis Research Center Cleveland, OH, United States)
Gabb, T. P.
(NASA Lewis Research Center Cleveland, OH, United States)
Miner, R. V.
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 13, 2013
Publication Date
October 1, 1986
Publication Information
Publication: International Journal of Fatigue
Volume: 8
ISSN: 0142-1123
Subject Category
Metallic Materials
Accession Number
87A24040
Distribution Limits
Public
Copyright
Other

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