The Effectiveness of a NiCrY-Coating on a Powder Metallurgy Disk Superalloy

Gabb, Timothy P ; Miller, Robert A ; Nesbitt, James A ; Draper, Susan L ; Rogers, Richard B ; Telesman, Jack

关键词: CHROMIUM ALLOYS;    DUCTILITY;    FATIGUE LIFE;    FATIGUE (MATERIALS);    HEAT RESISTANT ALLOYS;    OXIDATION;    METAL COATINGS;    NICKEL ALLOYS;    POWDER METALLURGY;    PROTECTIVE COATINGS;    SHOT PEENING;    TURBINE ENGINES;    COMPRESSIBILITY;    CYLINDRICAL BODIES;    FATIGUE TESTS;    HIGH TEMPERATURE;    MATHEMATICAL MODELS;    OXYGEN TENSION;    REGRESSION ANALYSIS;    SURFACE TREATMENT;   

RP-ID  :  NASA/TM-2018- 219885,E-19507,GRC-E-DAA-TN54306

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来源: NASA Technical Reports Server

【 摘 要 】

Protective 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.