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The Effect of Hydrogen Annealing on the Impurity Content of Alumina-Forming Alloys

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Abstract

Previously, the effect of hydrogen annealing on increasing the adhesion of Al2O3 scales had been related to the effective desulfurization that occurred during this process. The simultaneous reduction of other impurities has now been reexamined for up to 20 impurity elements, in the case of five different alloys (NiCrAl, FeCrAl, PWA 1480, René 142, and René N5). Hydrogen annealing produced measurable reductions in elemental concentration for B, C, Na, Mg, Si, P, K, Sr, or Sn in varying degrees for at least one and up to three of these alloys. However, no single element was reduced by hydrogen annealing for all the alloys except sulfur. In many cases spalling occurred at low levels of these other impurities, while in other cases the scales were adherent at high levels of the impurities. No impurity besides sulfur was strongly correlated with adhesion.

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  1. NASA Glenn Research Center, Cleveland, Ohio, 44135

    James L. Smialek

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  1. James L. Smialek
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Smialek, J.L. The Effect of Hydrogen Annealing on the Impurity Content of Alumina-Forming Alloys. Oxidation of Metals 55, 75–86 (2001). https://doi.org/10.1023/A:1010325209121

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