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The high-temperature oxidation of Ni-20%Cr alloys containing various oxide dispersions

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Abstract

The oxidation behavior of Ni-20%Cr alloys containing approximately 3 vol.% Y2O3, ThO2, and A12O3 as dispersed particles has been examined in the temperature range 900 to 1200° C in slowly flowing oxygen at 100 Torr. The results show that the oxidation behavior of the Y2O3-, ThO2-, Al2O3-, and Ce02-containing alloys is very similar and that some anomalies in the behavior of the ThO2-containing alloy might be explained by the slower rate of chromium diffusion in this coarse-grained alloy. Two Al2O3-containing alloys were studied. One with a relatively coarse dispersoid size behaved in a manner analogous to a dispersion-free Ni-30% Cr alloy at 1100°C. The other alloy contained a dispersion of fine Al2O3 particles and behaved exactly like the Y2O3-containing alloy at 1000 and 1100°C, but at 1200° C oxidized at a faster rate. It has been shown that the adherent scales on dispersion-containing alloys have a stabilized fine grain size, whereas the nonadherent scales on dispersion-free alloys undergo grain growth.

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Authors and Affiliations

  1. Battelle, Columbus Laboratories, Columbus, Ohio

    I. G. Wright, B. A. Wilcox & R. I. Jaffee

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  1. I. G. Wright
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  2. B. A. Wilcox
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  3. R. I. Jaffee
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Additional information

This work has been supported by the Naval Air Systems Command under Contract No. N00019-72-C-0190.

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Wright, I.G., Wilcox, B.A. & Jaffee, R.I. The high-temperature oxidation of Ni-20%Cr alloys containing various oxide dispersions. Oxid Met 9, 275–305 (1975). https://doi.org/10.1007/BF00613277

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  • DOI: https://doi.org/10.1007/BF00613277

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