High temperature oxidation of Nb, NbC and Ni{sub 3}Nb and oxygen enhanced crack growth

Previous studies have shown that oxygen increased the rates of crack growth in Ni base superalloys at high temperatures (> 800 K) by up to four orders of magnitude over those observed in an inert environment for alloys such as inconel 718, Rene-95 and x 750. In this study, high temperature oxidat...

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Bibliographic Details
Published inScripta materialia Vol. 42; no. 3
Main Authors Miller, C.F., Simmons, G.W., Wei, R.P.
Format Journal Article
LanguageEnglish
Published United States 01.01.2000
Subjects
CRACK PROPAGATION
MATERIALS SCIENCE
MICROSTRUCTURE
NICKEL BASE ALLOYS
NIOBIUM
NIOBIUM ALLOYS
NIOBIUM CARBIDES
OXIDATION
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Summary:Previous studies have shown that oxygen increased the rates of crack growth in Ni base superalloys at high temperatures (> 800 K) by up to four orders of magnitude over those observed in an inert environment for alloys such as inconel 718, Rene-95 and x 750. In this study, high temperature oxidation studies of pure Nb, NbC and Ni{sub 3}Nb using XPS were undertaken (a) to provide direct confirmation of the oxidation of NbC, (b) to explore the possible role of Ni{sub 3}Nb and (c) to assess the relative reactivity of the latter two phases, along with Nb, with oxygen. Nb, NbC and Ni{sub 3}Nb were oxidized as a function of temperature and constant oxygen exposure, and the results are presented in this communication.
ISSN:1359-6462
1872-8456
DOI:10.1016/S1359-6462(99)00336-X