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

T. Perez (1) , J. Ghanbaja (1) , S. Mathieu (1) , L. Latu-Romain (2) , M. Vilasi (2) , Y. Wouters (2)

1 IJL - Institut Jean Lamour
2 SIMaP - Science et Ingénierie des Matériaux et Procédés

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.

Domaines: Sciences de l'ingénieur [physics]

T. Perez, J. Ghanbaja, S. Mathieu, L. Latu-Romain, M. Vilasi, et al.. 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. Scripta Materialia, 2020, 178, pp.176 - 180. ⟨10.1016/j.scriptamat.2019.11.030⟩. ⟨hal-03489025⟩