Abstract
We reveal various microfractographic signs of crack propagation in steels under the influence of hydrogenating media. These signs are related to the transportation of hydrogen in the process zone at the crack tip according to the diffusion or dislocation mechanisms. The intergranular fracture under cyclic loading shows that the hydrogen diffusion along grain boundaries is predominant. The transgranular fracture is caused by the combined action of the dislocation mechanism responsible for the intense hydrogenation of the metal along slip bands and the diffusion mechanism promoting the redistribution of hydrogen along the interfaces inside the grains.
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