Abstract
The influence of molybdenum addition on the oxidation behavior of ferritic stainless steel (FSS) was studied at 1,000 °C up to 100 h in air under isothermal conditions. The results were compared with molybdenum-free FSS in order to explain the role of molybdenum on the oxidation of Type 444 FSS. It is shown that molybdenum plays a similar protective role as the one observed with silicon by promoting the precipitation of Laves phase. Moreover, the Fe2(Nb, Mo) Laves phases with a small amount of silicon are found nearby the oxide–metal interface and deep in the metallic matrix along the grain boundaries. These highly protective Laves phases hinder the external diffusion of iron, chromium, and manganese cations from the matrix and prevent the internal diffusion of oxygen which leads to the lower oxidation rate and the better scale adherence.
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The authors thank J.Q. Gao and W. F. Zhao for helpful experiments on this manuscript.
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Shu, J., Bi, H., Li, X. et al. The Effects of Molybdenum Addition on High Temperature Oxidation Behavior at 1,000 °C of Type 444 Ferritic Stainless Steel. Oxid Met 78, 253–267 (2012). https://doi.org/10.1007/s11085-012-9304-8
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DOI: https://doi.org/10.1007/s11085-012-9304-8