A~ew m~tho~for determin~ng t~e permeability and solubility for hydrogen gas, at elevated tem~eratures, m a cylmdrIcal metal sl?ecImen IS described. The diffusion coefficient of the hydrogen atom, as obtamed from these measurements, IS reported for two rail steels in the temperature range 500-660°C.Resume-Une nouvelle methode pour determiner, a des temperatures elevees, la permeabilite et la solubilite de l'hydrogtme gazeux dans un echantillon metallique de forme cylindrique, est decrite.,Le coefficien~.d~diffusion des. ato~es. d'hydrogene, tel qu'obtenu a partir de mesures prises par cette methode, est utIlIse pour deux aCIers a raIl dans une gamme de temperatures comprises entre 500 et 660°C.
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