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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...
The microstructure evolution in carbide strengthened Alloy 602 CA during exposure to a synthetic flue gas (N 2 –2.5%O 2 –8.6%H 2 O–16.4%CO 2 ) at 1100°C has been studied. The chromium and aluminium loss resulted in a chromium depleted alloy subsurface area and the dissolution of the carbides within this area. An increase of the carbide fraction in the sample core was...
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