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Fatigue Life of a NiCr-Coated Powder Metallurgy Disk Superalloy After Varied Processing and ExposuresA protective ductile NiCr coating has shown promise to mitigate oxidation and corrosion attack on superalloy disk alloys. The effects of this coating on fatigue life and failure modes of the disk superalloy are an important concern. The objective of this study was to investigate the fatigue life and failure modes of disk superalloy specimens protected by this coating, using varied pre-coating and post-coating processes. Cylindrical gage fatigue specimens of a powder metallurgy-processed disk superalloy were grit blast or wet blast before being coated with a ductile NiCrY coating, then shot peened at low or medium levels after coating. All were then heat treated, some exposed, and finally all were subjected to fatigue at high temperature. The effects of varied pre-coating treatment, post-coating shot peening, and oxidation plus hot corrosion exposures on fatigue life with the coating were compared.
Document ID
20180007788
Document Type
Technical Memorandum (TM)
Authors
Gabb, Timothy P. (NASA Glenn Research Center Cleveland, OH, United States)
Nesbitt, James A. (NASA Glenn Research Center Cleveland, OH, United States)
Hass, Derek (Directed Vapor Technologies International Charlottesville, VA, United States)
Telesman, Ignacy (NASA Glenn Research Center Cleveland, OH, United States)
Draper, Susan (NASA Glenn Research Center Cleveland, OH, United States)
Puleo, Bernadette J. (NASA Glenn Research Center Cleveland, OH, United States)
Rogers, Richard B. (NASA Glenn Research Center Cleveland, OH, United States)
Miller, Robert A. (Vantage Partners, LLC Brook Park, OH, United States)
Date Acquired
November 20, 2018
Publication Date
November 1, 2018
Subject Category
Metals and Metallic Materials
Report/Patent Number
GRC-E-DAA-TN61818
NASA/TM-2018-220008
Funding Number(s)
WBS: WBS 081876.02.03.04.02.01
CONTRACT_GRANT: NNC12BA01B
CONTRACT_GRANT: NNX13CC70P
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
coating
disk
oxidation
corrosion
superalloy
fatigue

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