Abstract
The kinetics of hydrogen embrittlement of an N 80 steel have been studied in a Na2S-CH3COOH solution. Determination of hydrogen content, metal density and embrittlement degree, together with acoustic-emission measurements have shown that the hydrogen distribution with-in the metal lattice is time-dependent and strongly influenced by non-metallic inclusions. The inclusions cause local stress intensification, favoring hydrogen collection in the lattice around them. Fracturing of charged specimens at different times evidences a mechanism of crack inactivation. An explanation of crack inactivation in terms of plastic deformation around inclusions due to hydrogen-dislocation interaction is suggested.
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