Abstract
The present investigation examines the high-temperature oxidation behavior of Fe-Cr ferritic alloys containing 1.0% Hf which has been convened into an oxide dispersion. The oxide dispersions were produced by an internal oxidation treatment using a 50-50 Cr-Cr2O3 powder mixture in a sealed quartz capsule at 1100°C: the samples were not in direct contact with the powders. The effect of the dispersed oxide was spectacular under isothermal oxidation conditions, but it had almost no effect during thermal cycling conditions. Unlike the TiO2-containing Fe-Cr ferritic alloys, virtually no particle coarsening was observed. The absence of the coarse particles caused poor thermal cycling behavior, whereas in TiO2-containing ferritic alloys, coarse particles acted as oxide pegs giving a keying-on effect.
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References
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Goncel, O.T., Whittle, D.P. & Stringer, J. The oxidation behavior of Fe-Cr alloys containing HFO2-dispersed phase. Oxid Met 15, 287–295 (1981). https://doi.org/10.1007/BF01058830
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DOI: https://doi.org/10.1007/BF01058830