Abstract
The corrosion behaviors of a Fe13Cr4Al2Mo1.2Nb alloy in 360 °C aerated water and 400 °C superheated steam were investigated. A similar dual-layered oxide scale was formed under both conditions. However, the inner oxide layer was much thicker in 400 °C steam than in 360 °C water, indicating the occurrence of steam-accelerated corrosion. Nodular corrosion was observed following exposure to 360 °C water, while localized corrosion and Ni segregation along the grain boundary occurred after 120-d exposure to 400 °C steam. The Fe2Nb phase experienced delayed oxidation with respect to matrix, which involved transformation from amorphous Nb oxides to crystalline Nb2O5.
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