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Oxidation and hot corrosion of coated and bare oxide dispersion strengthened superalloy MA-755ECyclic hot corrosion and oxidation of an experimental oxide dispersion strengthened (ODS) superalloy MA-755E were conducted in a hot gas stream at Mach 0.3. The response of the ODS alloy, bare or with protective coatings, was similar to that of a conventional cast alloy, IN-792, in hot corrosion at 900 C. However, during oxidation at 1100 and 1150 C the ODS alloy differed from the cast alloy by developing a greater amount of subsurface porosity. Compared with a diffused aluminide coating, an electron beam vapor deposited NiCrAlY coating offered superior oxidation protection and decreased porosity formation. In additional testing, the tendency to form porosity was associated with the large grains of recrystallized powder metallurgy alloys but was independent of the presence of an oxide dispersion.
Document ID
19810058980
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Glasgow, T. K.
(NASA Lewis Research Center Cleveland, OH, United States)
Santoro, G. J.
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 11, 2013
Publication Date
April 1, 1981
Publication Information
Publication: Oxidation of Metals
Volume: 15
Subject Category
Metallic Materials
Accession Number
81A43384
Distribution Limits
Public
Copyright
Other

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