Abstract
Hydrogen transport parameters have been measured in two nickel base stainless alloys, HASTELLOY Alloys C-276 and G. Hydrogen diffusivity and permeability were determined by means of the electrolytic permeability technique over the temperature range of 17 to 90 °C. Although the two alloys are similar in composition and structure, they exhibited dramatically different hydrogen behavior. For Alloy C-276, the diffusivity in both the cold worked and annealed conditions decreased by a factor of two following low temperature (500 °C) aging. That behavior was related to ordering in the alloy. Unexpectedly, hydrogen trapping was not observed in Alloy C-276. An analysis of hydrogen transport in Alloy G indicated reversible and irreversible trapping of hydrogen by niobium substitutional atoms and second phase carbides, respectively. The hydrogen transport results were related to the hydrogen embrittlement tendencies of the two nickel base alloys.
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DAVID A. MEZZANOTTE, formerly Graduate Assistant with the Department of Metallurgical Engineering and Materials Science, University of Notre Dame.
NICHOLAS F. FIORE, formerly Professor and Chairman of the Department of Metallurgical Engineering and Materials Science, University of Notre Dame.
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Mezzanotte, D.A., Kargol, J.A. & Fiore, N.F. Hydrogen transport in nickel base stainless alloys. Metall Trans A 13, 1181–1186 (1982). https://doi.org/10.1007/BF02645500
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DOI: https://doi.org/10.1007/BF02645500