Add time:07/23/2019         Source:sciencedirect.com

The Sanicro 25 austenitic steel is foreseen as a potential material for steam superheaters and reheaters in ultra-supercritical power plants. The aim of investigation was to characterize in detail an oxide scale grown on the Sanicro 25 tube after fireside oxidation at 650 °C. The morphology of the oxide scale and the microstructure of the bulk material were investigated using advanced electron microscopy methods. A multilayered and multicomponent oxide scale containing mainly Cr2O3 was found on the surface exposed to combustion gases. Directly under the oxide scale, a chromium-depleted zone with no M23C6 carbides was observed.

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