Abstract
Environments containing water vapour are common in many industrial processes, such as power generation systems. Hence, long-term oxidation (1000 h) of P-91 and AISI 430 was studied at 650 and 800 °C, in 100% H2O atmosphere. The oxidation resistance of the AISI 430 is better than that of the P-91, due to the formation of protective phases on the surface. At 650 °C, a scale composed of Fe3O4, Fe2O3 and (Fe,Cr)3O4 is formed on P-91, although at 800 °C the scale is mainly composed of Fe3O4 and (Fe,Cr)3O4. On the other hand, on AISI 430 the scale is composed mainly of (Fe,Cr)2O3 at 650 °C, and at 800 °C a layer of Cr2O3 is formed and remains owing to the higher diffusion rate of Cr at this temperature than at 650 °C, the latter of which compensates the Cr depletion by the degradation of the chromia scale.
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Sánchez, L., Hierro, M.P. & Pérez, F.J. Effect of Chromium Content on the Oxidation Behaviour of Ferritic Steels for Applications in Steam Atmospheres at High Temperatures. Oxid Met 71, 173–186 (2009). https://doi.org/10.1007/s11085-008-9134-x
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DOI: https://doi.org/10.1007/s11085-008-9134-x