Influence of temperature on the oxidation behaviour of a ferritic-martensitic steel in supercritical water

Influence of temperature on the oxidation behaviour of a ferritic-martensitic steel in supercritical water
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温度对铁素体-马氏体钢在超临界水中氧化行为的影响

DOI:
10.1016/j.corsci.2016.10.020
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发表时间:
2016-12
期刊:
影响因子:
8.3
通讯作者:
Zhang Naigiang
Zhang Naigiang
中科院分区:
材料科学1区
文献类型:
--
作者:
Zhu Zhongliang;Xu Hong;Jiang Dongfang;Mao Xueping;Zhang Naigiang

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研究了铁素体-马氏体钢在560-650 °C和25 MPa的脱气超临界水中的氧化行为。在所有样品上形成的双层氧化物,由富Fe的外部磁铁矿层和富Cr的内部氧化物层组成。温度对氧化速率和氧化膜的形貌有很大的影响。氧化动力学表现出近似抛物线的行为。计算的活化能表明,氧化速率的控制步骤是向外扩散的Fe 2+和Fe 3+离子通过尖晶石晶格。氧化的温度依赖性背后的机制进行了进一步讨论。
The oxidation behaviour of a ferritic-martensitic steel exposed to deaerated supercritical water at 560–650 °C and 25 MPa was investigated. A double-layered oxide formed on all samples, consisting of an Fe-rich outer magnetite layer and a Cr-rich inner oxide layer. The temperature had a strong influence on the oxidation rate and morphology of the oxide films. The oxidation kinetics showed nearly parabolic behaviour. The calculated activation energy indicated that the oxidation rate-controlling step was the outward diffusion of Fe2+and Fe3+ions through the spinel lattice. The mechanism behind the temperature dependence of the oxidation is further discussed.
DOI: 10.1016/s0010-938x(69)80083-1
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