Comparison of the high temperature surface reactivity in impure helium of two materials for gas cooled reactors

Abstract : Nickel base alloys Haynes 230 and Inconel 617 are of interest for gas cooled reactors. At high temperature in impure helium, they generally form surface chromium-rich oxides. However above a critical temperature called T-A, the scales are not stable anymore and the chromia destruction comes with a production of carbon monoxide. Reactivity tests on model alloys, with and without carbon, prove that chromia is reduced by the carbon from the alloy. TA VS P(CO) curves were also plotted for the two commercial alloys based on the experimental determination of T-A in various atmospheres with increasing partial pressures of carbon monoxide. Unexpectedly, both materials exhibit an almost ideatical behavior although a basic equilibrium approach suggests that the chromia scale would be reduced in different conditions due to the thermodynamic particularity of the interfacial alloy/scale system.
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Contributor : Anna Fraczkiewicz <>
Submitted on : Thursday, April 22, 2010 - 4:34:33 PM
Last modification on : Thursday, February 7, 2019 - 4:28:09 PM

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  • HAL Id : emse-00475700, version 1

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Céline Cabet, Gouenou Girardin, F. Rouillard, Jérôme Chapovaloff, Krzysztof Wolski, et al.. Comparison of the high temperature surface reactivity in impure helium of two materials for gas cooled reactors. Materials Science Forum, Trans Tech Publications Inc., 2008, 595-598 (1-2), pp.439-448. 〈emse-00475700〉

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