Abstract
Microstructural investigation of Sanicro 25 austenitic steel after steam oxidation at 700 °C for up to 5000 h was conducted using advanced analytical- and high-resolution electron microscopy methods. The study revealed the presence of Cr2O3 plates at the scale surface. Underneath the scale was a chromium-depletion zone that evolved with the oxidation process. In the area that was not affected by oxidation, numerous M23C6, e-Cu precipitates and some W-rich Laves phase were formed.
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