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Diffusional Limits of Superalloy Desulfurization by Hydrogen Annealing

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Abstract

Hydrogen annealing was used to desulfurize Ni-superalloy PWA 1480 at multiple temperatures (T), times (t), and sample thickness (L). Initial sulfur (6 ppmw) was reduced to below 0.1 ppmw at the extremes. Residual sulfur, predicted by the thin slab diffusion solution, was in broad agreement with the published sulfur diffusivity (DS,Ni) but did not contract onto one normalized Arrhenius curve. Divergences occurred for low temperature (1000 °C) or extreme values of the diffusion parameter, DSt/L2, suggesting limitations.

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  1. Strongsville, OH, 44149, USA

    James L. Smialek

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Manuscript submitted January 28, 2021, accepted March 27, 2021.

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Smialek, J.L. Diffusional Limits of Superalloy Desulfurization by Hydrogen Annealing. Metall Mater Trans A 52, 2698–2701 (2021). https://doi.org/10.1007/s11661-021-06272-y

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