THEORETICAL INVESTIGATION OF THE MECHANISM OF HYDROGEN BRITTLENESS OFIRON AND OF ALLOY FE-CR

To investigate the atomic mechanisms of the hydrogen brittleness of ir on and Fe-Cr alloys we used the method of multicenter atom-atomic pote ntials to calculate the influence of dissolved hydrogen on the ideal u niaxial tensile and shear strength of metals, taking into account the indirect electron influence of hydrogen on the strength and rigidity o f interatomic bonds in the metal. The reduction of ideal strength of t he investigated materials under the effect of hydrogen amounts to 1-2% per 1 at. % of dissolved gas. Alloying with chromium reduces the embr ittling effect of hydrogen. Local changes of the strength characterist ics in regions enriched with hydrogen are regarded as factors accelera ting the growth of microcracks and failure of structural materials.