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| Oxidation Behavior of Ferritic-martensitic Steel P92 Exposed to Supercritical Water at 600 ℃/25 MPa |
| XU Hong, YUAN Jun, ZHU Zhongliang, ZHANG Qian, ZHANG Naiqiang |
| Key Laboratory of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education, North China Electric Power University, Beijing 102206, China |
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Abstract The oxidation behavior of ferritic-martensitic P92 steel was studied in supercritical waters containing different dissolved oxygen of 0, 100 and 300 μg/L at 600 ℃ under 25 MPa. The results show that a typical double-layered oxide scale is formed on all the samples, which consists an outer layer Fe-rich magnetite and an inner layer Cr-rich Fe-Cr spinel. Cracks on the surface of oxide scales are found at the initial oxidation stage, which is different from the experimental phenomenon in supercritical water at 550 ℃. A distinct gap between inner oxide layer and substrate alloy is observed in some regions of the sample which is exposed to the supercritical water containing 300 μg/L dissolved oxygen. The mechanism concerning the influence of dissolved oxygen on oxidation behavior and the gap formation is further discussed.
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Received: 07 June 2013
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