Abstract
The oxidation behavior of a commercially available Fe–22Cr alloy coated with a Co3O4 layer by metal organic—chemical vapor deposition was investigated in air with 1% H2O at 1,173 K and compared to the oxidation behavior of the non-coated alloy. The oxide morphology was examined with X-ray diffraction, electron microscopy, and energy dispersive X-ray spectroscopy. Cr2O3 developed in between the Co3O4 coating and the alloy, while alloying elements of the substrate were incorporated into the coating. Particular attention was devoted to possible sources of growth stresses and the effect of the growth stresses on microstructure evolution in the scales that developed on the non-coated and the coated Fe–22Cr alloy. Microstructural features suggested that scale spallation on coated Fe–22Cr occurred as a result of superimposing thermal stresses during cooling onto the growth stresses, that had developed during oxidation.
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Notes
XRD was performed in transmission geometry with ψ maintained at 90° (sin2(ψ)-method). The strains were measured by the shift of the peaks in the 2θ-range: 10–30°. Calibration was performed before each measurement using a Cr2O3 powder reference
The sin2(ψ)-method was used in the stress measurement. The diffraction of the (166) plane (∼2θ-range: 53–56°) was measured at different tilt-angles. Calibration was performed using a Cr2O3 powder reference
The measurements were performed by XRD using the sin2(ψ)-method. The diffraction of the (226) lattice plane in Cr2O3 (∼2θ-range: 143–156°) was measured at different tilt-angles. The peak overlapped with the diffraction peak from the (311) planes in the Ni–30Cr substrate at temperatures above 873 K
The stress measurements were performed by Raman spectroscopy
It is noted that the present observations are consistent with the hypothesis in ref 21 that whiskers grow under conditions where the supply of oxygen atoms is limited
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Dr. Leona Korcakova, Risø National Laboratory, is acknowledged for assistance with the TEM investigation.
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Hansson, A.N., Burriel, M., Garcia, G. et al. Oxidation of Fe–22Cr Coated with Co3O4: Microstructure Evolution and the Effect of Growth Stresses. Oxid Met 68, 23–36 (2007). https://doi.org/10.1007/s11085-007-9060-3
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DOI: https://doi.org/10.1007/s11085-007-9060-3