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- W9862308 abstract "Cracking had occurred in the keyway of a low-pressure turbine disc from Cooper. We evaluated a section of the disc to determine whether the tensile and Charpy V-notch (CVN) toughness properties in the hub region corresponded to those originally specified for this disc. We also characterized the microstructure of the steel and analyzed the bore surface. Room-temperature tensile properties and FATT/sub 50/ were found to be essentially unchanged from the specified values. The steel was relatively clean. However, excessive segration was present and was reflected by variations in grain size, microhardness, sulfur distribution, and inclusion content. Using x-ray analysis, we identified the presence of an MoS/sub 2/ deposit and an FeCr/sub 2/O/sub 4/ corrosion film along the bore. We propose that excessive segregation (inclusions, alloying elements, embrittling constituents) contributes to excessive scatter in our CVN results. Segregation and MoS/sub 2/ lubricant may both contribute to the cracking problem." @default.
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- W9862308 date "1981-02-01" @default.
- W9862308 modified "2023-09-27" @default.
- W9862308 title "Characterization and evaluation of a turbine disc section containing a service crack" @default.
- W9862308 hasPublicationYear "1981" @default.
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