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Journal Articles

Corrosion of 9-12Cr ferritic-martensitic steels in high-temperature CO$$_{2}$$

Rouillard, F.*; Furukawa, Tomohiro

Corrosion Science, 105, p.120 - 132, 2016/04

 Times Cited Count:57 Percentile:96.53(Materials Science, Multidisciplinary)

The high temperature corrosion behavior of two 9Cr and 12Cr ferritic-martensitic steel grades was studied under CO$$_{2}$$ pressure varying from 1 to 250 bar for exposure times up to 8000 h. No breakaway oxidation was observed. 9Cr steel grades suffered from fast parabolic uniform oxidation and fast carburisation. Increasing CO$$_{2}$$ pressure had very little effect on the oxidation rate but increased the carburisation rate. The corrosion behavior of both 12Cr steel grades differed and might be influenced by gas composition, minor elements or surface finish. A corrosion mechanism coupling oxidation and carburisation is proposed.

Journal Articles

Oxidation and carburizing of FBR structural materials in carbon dioxide

Furukawa, Tomohiro; Rouillard, F.*

Progress in Nuclear Energy, 82, p.136 - 141, 2015/07

 Times Cited Count:23 Percentile:92.84(Nuclear Science & Technology)

The application of a supercritical carbon dioxide (SC-CO$$_{2}$$) turbine cycle to fast rectors has the potential to enhance reliability because the SC-CO$$_{2}$$ turbine system is capable of replacing the steam generator turbine system of conventional sodium cooled fast reactors. A key problem in the application is the corrosion of structural material by SC-CO$$_{2}$$ at high temperatures. The authors have performed corrosion test on high-chromium martensitic and austenitic stainless steels in CO$$_{2}$$ under the pressure conditions from atmospheric pressure to 25 MPa at elevated temperature, and proposed corrosion allowances of the steels for preliminary design of the SC-CO$$_{2}$$ system. This paper initially reports the results of metallurgical examination of the steels after 8010 hours in SC-CO$$_{2}$$ which is the longest immersion data in our experiments, and then describes the behavior of the oxide growth from the view point of estimation of the corrosion allowance for the design.

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