Microstructure, Chemical- and Phase Composition of Sanicro 25 Austenitic Steel After Oxidation in Steam at 700 °C
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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, ε-Cu precipitates and some W-rich Laves phase were formed.
KeywordsSanicro 25 TEM Oxidation Steam
The study was supported by the AGH-UST Project No. 184.108.40.2069. The authors would like to thank Adam Gruszczyński, M.Sc. and Krystyna Płońska-Niżnik (both AGH-UST) for FIB lamellae and conventional sample preparation, respectively. A. Agüero and V. González would like to acknowledge the Spanish Ministry of Economy and Energy for financial support (ENE2014-52359-C3-1-R). The authors also acknowledge KMM-VIN for supporting collaboration between AGH-UST and INTA institutions.
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