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Oxidation Behavior of Cr2N, CrNbN, and CrTaN Phase Mixtures Formed on Nitrided Cr and Laves-Reinforced Cr Alloys

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Abstract

A series of single-phase Cr(X), single phase Cr 2X Laves phase, and two-phase Cr(X) + Cr2 X alloys (X = Nb or Ta) were thermally nitrided for 24 hr at 1100°C in N2--4H2 and then oxidized for 2 hr at 1100°C in air. The Cr(X) phase nitrided to form Cr2N while the Cr2X phases nitrided to form a complex local mixture of Cr2N/Cr and CrNbN/CrTaN, Cr3Nb3N/Cr3Ta3N phases depending on the depth in the nitrided zone. The Ta only slightly increased the isothermal oxidation rate of nitrided Cr(Ta) and Cr2Ta-reinforced Cr alloys, compared with nitrided, unalloyed Cr. Further, the nitrided two-phase alloys Cr--9.5Ta and Cr--20Ta exhibited improved Cr2O3 scale adherence relative to nitrided unalloyed Cr and Cr--1Ta. In contrast, Nb was detrimental to the oxidation resistance of the nitrided Cr(Nb) and Cr2Nb-reinforced Cr alloys, resulting in the formation of nonprotective Cr--Nb oxides rather than continuous Cr2O3. A phenomenological explanation for these effects based on phase chemistry and microstructural distribution is presented. Implications of these results for understanding the oxidation behavior of developmental high-temperature, Laves-strengthened Cr alloys, as well as possible applications as oxidation and wear-resistant coatings are discussed.

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  1. Oak Ridge National Laboratory, Oak Ridge, TN, 37831-6115, USA

    M. P. Brady, P. F. Tortorelli, E. A. Payzant & L. R. Walker

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  1. M. P. Brady
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  3. E. A. Payzant
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  4. L. R. Walker
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Brady, M.P., Tortorelli, P.F., Payzant, E.A. et al. Oxidation Behavior of Cr2N, CrNbN, and CrTaN Phase Mixtures Formed on Nitrided Cr and Laves-Reinforced Cr Alloys. Oxidation of Metals 61, 379–401 (2004). https://doi.org/10.1023/B:OXID.0000032330.95411.ec

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