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Oxidation behavior of TD-NiCr in a dynamic high temperature environmentThe oxidation behavior of TD-NiCr has been studied in static and high-speed flowing air environments at 1100 and 1200 C. 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, high-speed flow conditions and was quickly replaced by a porous NiO 'mushroom' type structure. Also, it was found that the rate of formation of CrO3 from Cr2O3 was greatly enhanced by high gas velocity conditions. The stability of Cr2-O3 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.
Document ID
19740046827
Document Type
Reprint (Version printed in journal)
Authors
Tenney, D. R. (Virginia Polytechnic Institute and State University Blacksburg, Va., United States)
Young, C. T. (Bendix Research Center Southfield, Mich., United States)
Herring, H. W. (NASA Langley Research Center Hampton, Va., United States)
Date Acquired
August 7, 2013
Publication Date
May 1, 1974
Publication Information
Publication: Metallurgical Transactions
Volume: 5
Subject Category
MATERIALS, METALLIC
Funding Number(s)
CONTRACT_GRANT: NGR-47-040-082
Distribution Limits
Public
Copyright
Other