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The high temperature deformation in cyclic loading of a single crystal nickel-base superalloyThe high temperature cyclic stress softening response of the single crystal nickel-base superalloy PWA 1480 was investigated. Specimens oriented near the 001- and 111-lines were tested at 1050 C in low-cycle fatigue and then microstructurally evaluated. The 001- and 111-line specimens had dissimilar flow behavior in monotonic tensile tests, but comparable softening in low-cycle fatigue. This softening was accompanied by rapid generation of dislocation networks at the gamma-gamma-prime interfaces and by a slower time-dependent coarsening of gamma-prime precipitates. Due to the rapid formation of a dislocation substructure at the gamma-gamma-prime interfaces, the cyclic stress softening could be modeled with an existing theory which related cyclic stress to the evolving microstructure and dislocation structure.
Document ID
19900024479
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Gabb, T. P.
(NASA Lewis Research Center Cleveland, OH, United States)
Welsch, G.
(Case Western Reserve University Cleveland, OH, United States)
Date Acquired
August 14, 2013
Publication Date
September 1, 1989
Publication Information
Publication: Acta Metallurgica
Volume: 37
ISSN: 0001-6160
Subject Category
Metallic Materials
Accession Number
90A11534
Distribution Limits
Public
Copyright
Other

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