Journal
CORROSION SCIENCE
Volume 96, Issue -, Pages 32-41Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2015.03.019
Keywords
Nickel; Superalloys; Modelling studies; High temperature corrosion; Internal oxidation
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The high-temperature oxidation resistance of the carbide strengthened nickel-base alloy 602 CA is provided by the formation of a protective outer Cr2O3 scale accompanied by internal precipitation of alumina and dissolution of Cr-rich carbides. The carbide free zone formation has been discussed in the literature to be a consequence of either chromium depletion or alloy decarburization. A new dissolution mechanism is proposed in this paper. Carbide dissolution in alloy 602 CA exposed to oxidizing atmospheres at 1100 degrees C was studied. The alloy microstructure was characterized by means of SEM/EDX/EPIVIA and GDOES. The experimental observations were substantiated by CALPHAD based computations. (C) 2015 Elsevier Ltd. All rights reserved.
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