TEM comparative study on oxide films of 316L and T91 steel exposed to 350–500 °C steam
TEM comparative study on oxide films of 316L and T91 steel exposed to 350–500 °C steam
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DOI：
10.1016/j.jmst.2023.07.046
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通讯作者：
Chao Liu;Le Qi;T. Shen;Peng Jin;Zhiguang Wang
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文献类型：
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作者：
Chao Liu;Le Qi;T. Shen;Peng Jin;Zhiguang Wang
使用透射电子显微镜（TEM）研究暴露于350-500 °C蒸汽的316L和T91的氧化膜。与暴露温度无关，在316 L上形成具有外部磁铁矿、内部富Cr（Fe1.4Cr1.6O4）和富Ni层的三重氧化物结构，而在T91上仅形成具有外部磁铁矿和内部富Cr（Fe2.2Cr0.8O4）层的双重层。作为氧化剂的快速通道和固态扩散的障碍，纳米孔均匀分布在富铬内层，并且在316 L中比T91中更丰富。根据氧化膜的微观特征，了解材料的氧化行为。
The oxide films of 316L and T91 exposed to 350–500 °C steam were investigated using transmission electron microscopy (TEM). Independent of the exposure temperature, a triplex oxide structure with outer magnetite, inner Cr-rich (Fe1.4Cr1.6O4), and Ni-rich layer formed on 316L, while only a duplex layer with outer magnetite and inner Cr-rich (Fe2.2Cr0.8O4) layer formed on T91. As the fast channels for oxidant and the obstacles for solid-state diffusion, nanopores are distributed evenly in the Cr-rich inner layer and are more abundant in 316L than in T91. The oxidation behavior of the materials was understood based on the microscopic characteristics of the oxide films.