No abstract

Hydrogen absorption by and the desorption rate of hydrogen from steel were studied as a function of cold work from 0 to 55.4 percent reduction using cold-drawn capped and killed SAE 1020 steel. Increased cold work increased the hydrogen solubility in these steels. Hydrogen desorption rate increased with increasing cold work until a maximum was reached at some point below 30.5 percent reduction. With further reduction, the desorption rate decreased. 3.7.3

Tests were made to determine the effect of cold reduction on hydrogen solubility in steel. It was found that this direct relationship persisted through subsequent heat-treatment and later cold reduction. This was not true, though, of hydrogen permeability. Increasing the amount of cold reduction increased the hydrogen solubility. Increasing the amount of cold reduction also increased the hydrogen permeability until a maximum was reached (below 30 percent reduction for initially hot-rolled steel), after which the permeability decreased as the amount of cold work increased. 3.7.3

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Discusses an investigation which shows that cold work markedly affects hydrogen's entry, solubility and desorption rate in steel. Also clarifies effect of processing variables on hydrogen behavior in steel. Includes discussion of materials, apparatus, environmental conditions and procedures used in experiments. 3.7.3