A novel nitridation- and pesting-resistant Cr-Si-Mo alloy

F. Hinrichs, A. Kauffmann, A. Srinivasan Tirunilai, D. Schliephake, B. Beichert, G. Winkens, K. Beck, A.S. Ulrich, M.C. Galetz, Z. Long, H. Thota, Y. Eggeler, A. Pundt, M. Heilmaier

Corrosion Science 207 (2022), 110566, DOI: 10.1016/j.corsci.2022.110566

Hinrichs2022

a) Macroscopic sample images after 100 h at 800, 1100, 1200 °C and specific mass change for cyclic oxidation in laboratory air up to 100 h at b) 800, c) 1100 and d) 1200 °C. Note the different scaling of the diagram for 800 °C in c.
Reprinted from Corrosion Science 207 (2022) with permission from Elsevier.

Cr-13.5Si-32.2Mo (at%) solidifies as metastable σ-phase with a dendritic microstructure during arc melting. Heat treatment leads to a decomposition into a fine-lamellar microstructure of (Cr,Mo)ss and (Cr,Mo)3Si. A protective Cr2O3 layer with low growth rates was formed upon cyclic oxidation at 800, 1100 and 1200 °C for up to 100 h. In addition to the Cr2O3 layer, the formation of an internal silicon oxide layer is found for 1200 °C. Oxide scales show parabolic growth rates at 1100 and 1200 °C. Up to 100 h, the oxidation occurred remarkably free of nitridation, spallation or pesting.

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