Effect of Exposure Temperature on Oxidation of Austenitic Steel HR3C in Supercritical Water
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Oxidation tests of the austenitic steel HR3C were conducted at 600–700 °C in supercritical water under 25 MPa. The characteristics of oxide scales formed on HR3C were investigated using gravimetry, grazing incidence X-ray diffraction, electron back-scatter diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. The oxidation kinetics obeyed a near-parabolic law at 600 °C but followed a near-cubic law at 620–700 °C. The oxide films consisted of an Fe-rich outer layer and a Cr-rich inner layer. The phase constitution of the outer layer was Fe2O3 and Fe3O4, while the inner layer was spinel. Moreover, a continuous Cr2O3 formed at the oxide/steel interface during exposure at 700 °C.
KeywordsStainless steel Supercritical water EBSD Oxidation
This paper was supported by the Fundamental Research Funds for the Central Universities (2018QN012), the National Natural Science Foundation of China (51471069), Science and Technology Program of Beijing (Z181100005218006), and the Natural Science Foundation of Beijing (2152029).
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