Abstract
The influenoe of metallurgical factors such as grain size, cold work, annealing, microstructure and stress on the diffusion and permeation of hydrogen through iron and steel has been studied. The results of heat treatment and annealing show that grain boundaries have no effect on the permeation of hydrogen through iron. The effect of cold-rolling indicates “trapping” of hydrogen by interaction with vacancies and dislocations. Metallurgical structure exerts a marked influence on the rate of permeation of hydrogen; sorbitic structures have the maximum permeability. Tensile loading in the elastic range increased the permeation of hydrogen; the effect was nearly reversible for shim steel. The diffusion coefficient of hydrogen in iron and steel under various metallurgical and heat-treated conditions have been evaluated, and it is suggested that the anomalies in the values of the diffusion coefficients are due to “trapping” of hydrogen.
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