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Examination of Oxide Scales on Heat Resisting Alloys
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CENTER
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Twelve iron, nickel, and cobalt heat resisting alloys were cyclic furnace oxidation tested at from 1400 degrees to 2200 degrees F 1033 to 1478 K for from 4 to 600 hours. Retained oxide scales and spall were identified using X-ray diffraction combined with X-ray fluorescence analysis. Metallography clarified scale growth sequences. After 600 hours at 2000 degrees F 1366 K, the condition most studied, the best oxidation resistance, as reflected by weight change and spall weight, was exhibited by alloys forming single oxide scales of Al2O3 or Cr2O3. For alloys that developed multioxide scales, spinel constituent composition or lattice parameter did not correlate with oxidation resistance.
APPROVED FOR PUBLIC RELEASE