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首页> 外文期刊>Materials at High Temperatures >Oxygen potential distribution during disappearance of the internal oxidation zone formed in the steam oxidation of Fe-9Cr-0.26Si ferritic steel at 973 K
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Oxygen potential distribution during disappearance of the internal oxidation zone formed in the steam oxidation of Fe-9Cr-0.26Si ferritic steel at 973 K

机译:Fe-9Cr-0.26Si铁素体钢在973 K蒸汽氧化中形成的内部氧化区消失时的氧势分布

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摘要

For discussing quantitatively the disappearance of the internal oxidation zone (IOZ), which was observed in the high temperature steam oxidation of the commercial Fe-9Cr-0.26Si ferritic steel (ASME T91), the oxygen potential distribution in the IOZ was calculated as a function of the normalized thickness of the IOZ. The distribution of the internal oxides was predicted with the calculated oxygen potential distribution and thermodynamic data. The predicted distribution of the internal oxides was in good agreement with the TEM observation at the internal oxidation front. When a sheet of amorphous SiO_2 formed at the internal oxidation front, the oxygen potential at IOZ/SiO_2 interface was calculated to be almost as same as that at the inner scale/IOZ interface because of the low oxygen permeability in the sheet of the SiO_2. The increase in the oxygen potential oxidizes the matrix of iron in the IOZ and converts the IOZ to the inner scale.
机译:为了定量讨论内部氧化区(IOZ)的消失(在商用Fe-9Cr-0.26Si铁素体钢(ASME T91)的高温蒸汽氧化中观察到的),将IOZ中的氧势分布计算为IOZ归一化厚度的函数。利用计算出的氧势分布和热力学数据预测内部氧化物的分布。内部氧化物的预测分布与内部氧化前沿的TEM观察非常吻合。当在内部氧化前沿形成无定形SiO_2时,由于SiO_2片中的低氧渗透性,因此IOZ / SiO_2界面处的氧势经计算与内部氧化皮/ IOZ界面处的氧势几乎相同。氧势的增加会氧化IOZ中的铁基质,并将IOZ转换为内部水垢。

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