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Hydrogen induced fracture characteristics of single crystal nickel-based superalloysA stereoscopic method for use with x ray energy dispersive spectroscopy of rough surfaces was adapted and applied to the fracture surfaces single crystals of PWA 1480E to permit rapid orientation determinations of small cleavage planes. The method uses a mathematical treatment of stereo pair photomicrographs to measure the angle between the electron beam and the surface normal. One reference crystal orientation corresponding to the electron beam direction (crystal growth direction) is required to perform this trace analysis. The microstructure of PWA 1480E was characterized before fracture analysis was performed. The fracture behavior of single crystals of the PWA 1480E nickel-based superalloy was studied. The hydrogen-induced fracture behavior of single crystals of the PWA 1480E nickel-based superalloy was also studied. In order to understand the temperature dependence of hydrogen-induced embrittlement, notched single crystals with three different crystal growth orientations near zone axes (100), (110), and (111) were tensile tested at 871 C (1600 F) in both helium and hydrogen atmospheres at 34 MPa. Results and conclusions are given.
Document ID
19900016792
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Chen, Po-Shou (Auburn Univ. AL, United States)
Wilcox, Roy C. (Auburn Univ. AL, United States)
Date Acquired
September 6, 2013
Publication Date
June 18, 1990
Subject Category
Metallic Materials
Report/Patent Number
NAS 1.26:183992
NASA-CR-183992
Accession Number
90N26108
Funding Number(s)
CONTRACT_GRANT: NAS8-38184
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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