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Hydrogen Annealing Of Single-Crystal SuperalloysAnnealing at temperature equal to or greater than 2,200 degrees F in atmosphere of hydrogen found to increase ability of single-crystal superalloys to resist oxidation when subsequently exposed to oxidizing atmospheres at temperatures almost as high. Supperalloys in question are principal constituents of hot-stage airfoils (blades) in aircraft and ground-based turbine engines; also used in other high-temperature applications like chemical-processing plants, coal-gasification plants, petrochemical refineries, and boilers. Hydrogen anneal provides resistance to oxidation without decreasing fatigue strength and without need for coating or reactive sulfur-gettering constituents. In comparison with coating, hydrogen annealing costs less. Benefits extend to stainless steels, nickel/chromium, and nickel-base alloys, subject to same scale-adhesion and oxidation-resistance considerations, except that scale is chromia instead of alumina.
Document ID
19950065186
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Smialek, James L.
(NASA Lewis Research Center, Cleveland, OH.)
Schaeffer, John C.
(General Electric Co.)
Murphy, Wendy
(General Electric Co.)
Date Acquired
August 17, 2013
Publication Date
January 1, 1995
Publication Information
Publication: NASA Tech Briefs
Volume: 19
Issue: 1
ISSN: 0145-319X
Subject Category
Materials
Report/Patent Number
LEW-15771
Accession Number
95B10027
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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