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The Effectiveness of a NiCrY-Coating on a Powder Metallurgy Disk SuperalloyProtective ductile coatings could be necessary to mitigate oxidation and corrosion attack on superalloy disks in some turbine engine applications. However, the effects of coatings on fatigue life of the disk during service are an important concern. The objective of this study was to investigate how such a coating could perform after varied post-coating processing. Cylindrical gage fatigue specimens of powder metallurgy-processed disk superalloy LSHR were coated with a NiCrY coating, shot peened, preparation treated, exposed, and then subjected to fatigue at high temperature. The effects of varied shot peening, preparation treatment, and exposures on fatigue life with and without the coating were compared. Each of these variables and several of their interactions significantly influenced fatigue life.
Document ID
20180002562
Document Type
Technical Memorandum (TM)
Authors
Gabb, Timothy P. (NASA Glenn Research Center Cleveland, OH, United States)
Miller, Robert A. (Vantage Partners, LLC Cleveland, OH, United States)
Nesbitt, James A. (NASA Glenn Research Center Cleveland, OH, United States)
Draper, Susan L. (NASA Glenn Research Center Cleveland, OH, United States)
Rogers, Richard B. (NASA Glenn Research Center Cleveland, OH, United States)
Telesman, Jack (NASA Glenn Research Center Cleveland, OH, United States)
Date Acquired
April 27, 2018
Publication Date
April 1, 2018
Subject Category
Chemistry and Materials (General)
Report/Patent Number
GRC-E-DAA-TN54306
NASA/TM-2018- 219885
E-19507
Funding Number(s)
WBS: WBS 081876.02.03.04.02.01
CONTRACT_GRANT: NNC12BA01B
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
ductile coatings
superalloy
shot peening

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