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Cyclic Oxidation and Hot Corrosion of NiCrY-Coated Disk SuperalloysPowder metallurgy disk superalloys have been designed for higher engine operating temperatures through improvement of their strength and creep resistance. Yet, increasing disk application temperatures to 704 degrees Centigrade and higher could enhance oxidation and activate hot corrosion in harmful environments. Protective coatings could be necessary to mitigate such attack. Cylindrical coated specimens of disk superalloys LSHR and ME3 were subjected to thermal cycling to produce cyclic oxidation in air at a maximum temperature of 760 degrees Centigrade. The effects of substrate roughness and coating thickness on coating integrity after cyclic oxidation were considered. Selected coated samples that had cyclic oxidation were then subjected to accelerated hot corrosion tests. This cyclic oxidation did not impair the coating's resistance to subsequent hot corrosion pitting attack.
Document ID
20160007899
Acquisition Source
Glenn Research Center
Document Type
Technical Memorandum (TM)
Authors
Gabb, Timothy P.
(NASA Glenn Research Center Cleveland, OH United States)
Miller, Robert A.
(Vantage Partners, LLC Brook Park, OH, United States)
Sudbrack, Chantal K.
(NASA Glenn Research Center Cleveland, OH United States)
Draper, Susan L.
(NASA Glenn Research Center Cleveland, OH United States)
Nesbitt, James A.
(NASA Glenn Research Center Cleveland, OH United States)
Rogers, Richard B.
(Stinger Ghaffarian Technologies, Inc. Greenbelt, MD, United States)
Telesman, Ignacy
(NASA Glenn Research Center Cleveland, OH United States)
Ngo, Vanda
(Arizona Univ. Tucson, AZ, United States)
Healy, Jonathan
(Vantage Partners, LLC Brook Park, OH, United States)
Date Acquired
June 24, 2016
Publication Date
June 1, 2016
Subject Category
Metals And Metallic Materials
Report/Patent Number
NASA/TM-2016-219105
E-19229
GRC-E-DAA-TN31568
Meeting Information
Meeting: Materials Science and Technology 2015
Location: Columbus, OH
Country: United States
Start Date: October 4, 2015
End Date: October 8, 2015
Sponsors: American Ceramic Society, Association for Iron and Steel Technology (AIST), ASM International, Minerals, Metals and Materials Society
Funding Number(s)
CONTRACT_GRANT: NNX13AJ46A
WBS: WBS 081876.02.03.04.02.01
CONTRACT_GRANT: NNC12BA01B
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
protective coating
superalloy
residual cracking
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