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The mechanism of hydrogen induced cleavage in Fe-3 pct Si alloy

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Abstract

Hydrogen promotes the cleavage fracture of Fe-3 pct Si alloy. Hydrogen atmospheres moving alone with a dislocation will reduce the strain energy of the dislocation, resulting in decreasing the exte nal stress necessary to operate the Frank-Read source. Thus, hydrogen can promote dislocation mul tiplication, which has been verified using a dislocation decoration technique. Fractography and mechanics analysis indicate that a set of the [001] sessile dislocations on the [001] plane is just a cleavage microcrack. Hydrogen carried by the gliding dislocations will enter into the microcrack and the hydrogen pressure will augment the external stress and reduce the critical numbern necessary to form a stable cleavage crack and the numberm of the piled-up dislocations. This indicates that hydrogen promotes the formation of the stable cleavage crack before the other slip systems operate

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Authors and Affiliations

  1. Department of Metal Physics, Beijing University of Iron and Steel Technology, Beijing, China

    Yan-Bin Wang (Instructor), Wu-Yang Chu (Professor) & Chi-Mei Hsiao (Professor and Head)

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  1. Yan-Bin Wang
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  2. Wu-Yang Chu
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Wang, YB., Chu, WY. & Hsiao, CM. The mechanism of hydrogen induced cleavage in Fe-3 pct Si alloy. Metall Trans A 19, 1335–1343 (1988). https://doi.org/10.1007/BF02662594

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  • DOI: https://doi.org/10.1007/BF02662594

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