Evidence for internal oxidation during oxygen enhanced crack growth in P/M Ni-based superalloys

A surface chemistry study on P/M alloys confirmed (a) the preferential oxidation of Nb, Ti, Al and Cr on heated, polished surfaces and (b) the penetration of oxygen ahead of the crack tip during crack growth, leading to the oxidation of Nb, Ti, Al and Cr. These results support previous crack growth...

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Veröffentlicht in:	Scripta materialia 2003-01, Vol.48 (1), p.103-108
Hauptverfasser:	Miller, Christopher F, Simmons, Gary W, Wei, Robert P
Format:	Artikel
Sprache:	eng
Schlagworte:	Applied sciences Crack growth mechanism Exact sciences and technology Internal oxidation Metals. Metallurgy Ni base alloy Niobium Oxygen enhanced crack growth Powder metallurgy. Composite materials Production techniques Sintered metals and alloys. Pseudo alloys. Cermets X-ray photoelectron spectroscopy
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Zusammenfassung:	A surface chemistry study on P/M alloys confirmed (a) the preferential oxidation of Nb, Ti, Al and Cr on heated, polished surfaces and (b) the penetration of oxygen ahead of the crack tip during crack growth, leading to the oxidation of Nb, Ti, Al and Cr. These results support previous crack growth enhancement mechanisms for Ni-based superalloys that involve the oxidation of alloy phases ahead of the crack tip.
ISSN:	1359-6462 1872-8456
DOI:	10.1016/S1359-6462(02)00355-X