Oxidation behavior of HT9 steel in 700 °C – 900 °C steam
MATERIALI IN TEHNOLOGIJE(2019)
Abstract
Oxidation behavior of the HT9 steel exposed to 700 degrees C -900 degrees C steam was investigated with gravimetry, X-ray diffraction and scanning electron microscopy. It was found that the oxidation kinetics of the HT9 steel followed the parabolic law. The mass gain increased with a decreasing temperature. The steam oxidation of the HT9 steel at 800 degrees C and 900 degrees C was selective. The oxides formed on the HT9-steel surface displayed a double-layer structure, consisting of an outer columnar Fe2O3 layer and an inner (Fe, Cr)(3)O-4 layer.
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Key words
HT9 steel,steam oxidation,oxidation mechanisms
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