In order to make a clear distinction between hydrogen trapping and transport by dislocations, it is necessary to take the apparent diffusivity, Dapp, of hydrogen obtained from specimens involving approximately comparable dislocation structures and to compare them critically. The specimens in question should undergo plastic deformation differences only within a small range of strain to produce similar dislocation structures with different dislocation densities. The unstrained specimen, the 3.5 %-prior strained specimen and the 3.5 %-prior strained specimen, followed by additional straining at different strain rates have been prepared from 3.3 Ni - 1.6 Cr steel. The present static and dynamic hydrogen permeation experiments permitted us to measure the Dappof hydrogen and correlate the results with the trapping and transport effects. © 1989.
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