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首页> 外文期刊>Journal of Nuclear Materials: Materials Aspects of Fission and Fusion >Effect of water density on the oxidation behavior of alloy A-286 at 625 degrees C - A TEM study
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Effect of water density on the oxidation behavior of alloy A-286 at 625 degrees C - A TEM study

机译：水密度对625℃下A-286合金氧化行为的影响-TEM研究

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摘要

In this study the effect of water pressure on oxidation behavior of Alloy A-286 is assessed at 625 degrees C for 1000 h. The pressure values selected are 0.1, 8 and 29 MPa, representing steam, subcritical and supercritical conditions. Transmission electron microscopy (TEM) is used to study the oxide formation on the surface. A-286 sample exposed to supercritical water forms an oxide layer, about 1 mm, containing Fe2O3, spinel and Cr2O3. In addition, isolated internal oxidation, up to 10 mm, has taken place during the exposure. Recrystallization of substrate material is also observed. A-286 exposed to steam shows little oxidation. The oxide formed on the surface is only similar to 200 nm thick and it is comprised of a top layer of Cr2O3 and a thin sub-layer of SiO2, as well as limited grain boundary oxidation in the form of spinel (Cr, Fe, Ti)(3)O-4 and TiO2. In contrast, the sample tested under subcritical condition suffered from excessive external and internal oxidation, with about 20 mm of Fe2O3 on the external surface, followed by a partially oxidized zone (up to 20 mm) containing Cr2O3 on the prior grain boundaries and discrete Cr2O3 particles within the grain. The weight gain of A-286 exposed to subcritical condition is several orders of magnitude greater than that seen under steam condition. (C) 2015 Elsevier B.V. All rights reserved.
机译：在这项研究中，水压对A-286合金氧化行为的影响在625摄氏度下评估了1000小时。选择的压力值为0.1、8和29 MPa，代表蒸汽，亚临界和超临界条件。透射电子显微镜（TEM）用于研究表面氧化物的形成。暴露于超临界水中的A-286样品形成约1毫米的氧化层，其中含有Fe2O3，尖晶石和Cr2O3。此外，在曝光过程中发生了高达10 mm的孤立内部氧化。还观察到基材的重结晶。暴露于蒸汽中的A-286几乎没有氧化。表面上形成的氧化物仅类似于200 nm厚，它由Cr2O3的顶层和SiO2的薄子层以及尖晶石（Cr，Fe，Ti ）（3）O-4和TiO2。相反，在亚临界条件下测试的样品遭受了过度的内部和内部氧化，外表面上约有20 mm的Fe2O3，然后是部分氧化区域（最大20 mm），该区域在先前的晶界上含有Cr2O3和离散的Cr2O3谷物中的颗粒。暴露于亚临界条件下的A-286的增重比蒸汽条件下的增重大几个数量级。 （C）2015 Elsevier B.V.保留所有权利。

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