Abstract
The oxidation behavior of TD-NiCr has been studied in static and high-speed flowing air environments at 1100 and 1200°C. The surface oxide topographies and microstructures formed in both types of environments have been characterized and compared to explain some of the observed differences in the oxidation behavior for the two types of tests. It has been found that the stable oxide morphologies formed on the specimens exposed to the static and dynamic environments were markedly different. The faceted crystal morphology characteristic of static oxidation was found to be unstable under high-temperature, highspeed flow conditions and was quickly replaced by a porous NiO “mushroom” type structure. Also, it was found that the rate of formation of CrO3(v) from Cr2O3(s) was greatly enhanced by high gas velocity conditions. The stability of Cr2O3 was found to be greatly improved by the presence of an outer NiO layer, even though the NiO layer was very porous. An oxidation model is proposed to explain the observed microstructures and overall oxidation behavior of TD-NiCr alloys.
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Formerly a Research Fellow at Langley Research Center, Hampton, Va
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Tenney, D.R., Young, C.T. & Herring, H.W. Oxidation behavior of TD-NiCr in a dynamic high temperature environment. Metall Trans 5, 1001–1012 (1974). https://doi.org/10.1007/BF02644311
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DOI: https://doi.org/10.1007/BF02644311