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| Oxidation characteristic of ferritic–martensitic steel T91 in water–vapour atmosphere |
| ZHANG Duqing1;3; XU Jingjun2; ZHAO Guoqun1†; GUAN Yanjin1; LI Meishuan2 |
1.School of Materials Science & Engineering; Shandong University; Jinan 250061
2.Institute of Metal Research Chinese Academy of Sciences; Shenyang; 110016
3.Shandong Electric Research Institute; Jinan; 250013 |
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Cite this article:
ZHANG Duqing; XU Jingjun; ZHAO Guoqun; GUAN Yanjin; LI Meishuan. Oxidation characteristic of ferritic–martensitic steel T91 in water–vapour atmosphere. Chin J Mater Res, 2008, 22(6): 599-605.
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Abstract The oxidation behavior of 9Cr-1Mo steel in (Ar+10%H2O) atmosphere at 600 °C, 650 °C and 700 °C was investigated. During oxidation for 10h the oxidation kinetics followed parabolic law at 600 °C, but two–stage parabolic law at 650 °C and 700 °C, in which the rate constant at the initial stage was higher than that at the second stage. With increasing temperature, the oxidation rate of T91 steel increased significantly. The oxidation activation energy was identified as 157.2 kJ/mol. The oxide scale with three–layer microstructure was composed of Fe2O3, Fe3O4 and (Fe, Cr)3O4 in the order from the top layer to the inner layer. Meanwhile the internal oxidation was also observed, the corresponding internal oxides were Cr2O3 and FeO. However, at 700 °C, neither Fe2O3 outer layer nor internal oxides formed. The outer layer (Fe2O3) had a weak adhesion to the intermediate layer (Fe3O4) and easily spalled during cooling from oxidation temperature to room temperature. The oxidation mechanism of T91 in (Ar+H2O) atmosphere was discussed finally.
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Received: 18 February 2008
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