Elsevier

Scripta Materialia

Volume 178, 15 March 2020, Pages 176-180
Scripta Materialia

Microstructural characterization of the protective oxide scale forming on Ni–25Cr–xMn (x = 0.5, 1 and 1.5% wt) in a 200 Pa O2 environment at 1050 °C

https://doi.org/10.1016/j.scriptamat.2019.11.030Get rights and content

Abstract

To clarify the influence of manganese on the oxidation behavior of Ni–Cr alloys, high resolution transmission electron microscopy was used to examine the microstructure and chemistry of oxide scales forming at 1050 °C on Ni–25Cr–xMn (x = 0.5, 1 and 1.5% wt) in 200 Pa O2. The scales consisted of two layers of chromia and one layer of spinel Mn1+xCr2-xO4. The internal layer exhibited an equiaxed grain structure, whereas columnar grains developed in the outer layer. The results demonstrated that the spinel composition at the chromia-spinel interface was similar regardless of the manganese concentration.

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Acknowledgments

We are pleased to acknowledge Dr. R. Podor, Dr. J. Lautru and Ms S. Migot for their assistance, respectively, with the oxidation experiments and the FIB lamella extraction. The authors thank the French National Research Agency (ANR) for the support of the PSEUDO project (Grant No. ANR-15-CE08-0021).

Declaration of Competing Interest

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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