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Effects of hydrogen annealing, sulfur segregation and diffusion on the cyclic oxidation resistance of superalloys: A reviewThis review is based on the phenomenon of improved oxide scale adhesion for desulfurized superalloys. The proposed adhesion mechanism involves sulfur interfacial segregation and scale-metal bond weakening. Sulfur surface segregation on superalloys is examined as a function of temperature and sulfur content, and is related to the classical behavior predicted by the McLean isotherm. Effective desulfurization to less than 1 ppmw can be accomplished by hydrogen annealing and is described by sulfur diffusion kinetics in nickel. Hydrogen annealing results in excellent cyclic oxidation resistance for a number of advanced superalloys. The concept of a critical sulfur content is discussed in terms of practical annealing conditions and section thicknesses.
Document ID
19950062379
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Smialek, J. L.
(NASA Lewis Research Center Cleveland, OH, United States)
Jayne, D. T.
(Case Western Reserve University Cleveland, OH, United States)
Schaeffer, J. C.
(General Electric Aircraft Engines Cincinnati, OH, United States)
Murphy, W. H.
(General Electric Aircraft Engines Cincinnati, OH, United States)
Date Acquired
August 17, 2013
Publication Date
December 15, 1994
Publication Information
Publication: Thin Solid Films
Volume: 253
Issue: 1-2
ISSN: 0040-6090
Subject Category
Solid-State Physics
Accession Number
95A93978
Distribution Limits
Public
Copyright
Other

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