Microstructure of Cr2O3 Scales Grown in Ar-5H2O-(5H2) at 850 °C

IF 2.1 3区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Oxidation of Metals Pub Date : 2024-07-29 DOI:10.1007/s11085-024-10287-2

Thuan Dinh Nguyen, Jianqiang Zhang, David J. Young

引用次数: 0

Abstract

Model alloy, Fe-20Cr (wt%), was oxidized in two gas mixtures Ar-5H₂O-(5H₂) (vol%) at 850 °C. The alloy formed Cr₂O₃ scales in both gases. The Cr₂O₃ scale developed faster in Ar-5H₂O-5H₂ and contained fine pores, whilst that grown in Ar-5H₂O was dense. Experiments with inert SiO₂ marker revealed that the Cr₂O₃ scale growth in Ar-5H₂O-(5H₂) was controlled mainly by outward Cr diffusion. When adjusted for grain boundary diffusion effects, Wagner’s theory was successful in describing the hydrogen effect, provided that the Cr₂O₃ scales are n-type.

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850 °C 时在 Ar-5H2O-(5H2) 中生长的 Cr2O3 鳞片的微观结构

模型合金 Fe-20Cr（重量百分比）在两种混合气体 Ar-5H2O-(5H2)（体积百分比）中于 850 °C 下氧化。合金在两种气体中都形成了 Cr2O3 鳞片。Cr2O3 鳞片在 Ar-5H2O-5H2 中发展较快，并含有细孔，而在 Ar-5H2O 中生长的鳞片则致密。使用惰性二氧化硅标记的实验表明，Ar-5H2O-(5H2)中的 Cr2O3 鳞片生长主要受向外的 Cr 扩散控制。根据晶界扩散效应进行调整后，瓦格纳理论成功地描述了氢效应，前提是 Cr2O3 鳞片是 n 型的。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Oxidation of Metals 工程技术-冶金工程

CiteScore

5.10

自引率

9.10%

发文量

审稿时长

2.2 months

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