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<p>This work aimed to evaluate the effect of hydrogen on the mechanical properties of HSLA-340LA steel after cathodic charging and tensile testing. The steel presented a ferrite-pearlite microstructure with a fine grain obtained by thermomechanical process and the addition of microalloying elements such as Nb and Ti. To evaluate hydrogen embrittlement, samples were cathodically charged in 0.5&#xa0;M H₂SO₄ solution with an applied current density of 140&#xa0;mA&#xa0;cm<sup>−2</sup> for 1&#xa0;h. Hydrogen embrittlement indexes were determined to quantify which mechanical properties are susceptible to hydrogen-induced embrittlement. The results showed that hydrogen increases strength compared to the non-charged condition; however, the deformation and area reduction percentage values increased, indicating that localized plasticity enhanced by hydrogen mechanisms is predominant, as confirmed by the surface fracture analysis. In the permeability test, the apparent hydrogen concentration showed a high hydrogen trap compared to similar steels with similar characteristics.</p> Graphical abstract <p></p>

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Determination of susceptibility to hydrogen embrittlement and its effect on the mechanical properties of a cathodically charged HSLA steel

  • 期刊论文

  • 发表日期：

    2026年1月15日

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  • P. L. Segura-Rodríguez,
  • J. C. Villalobos,
  • M. S. López-Cornejo,
  • O. Vázquez-Gómez,
  • Y. Solana-Reyes,
  • M. Velasco-Plascencia

摘要

This work aimed to evaluate the effect of hydrogen on the mechanical properties of HSLA-340LA steel after cathodic charging and tensile testing. The steel presented a ferrite-pearlite microstructure with a fine grain obtained by thermomechanical process and the addition of microalloying elements such as Nb and Ti. To evaluate hydrogen embrittlement, samples were cathodically charged in 0.5 M H₂SO₄ solution with an applied current density of 140 mA cm−2 for 1 h. Hydrogen embrittlement indexes were determined to quantify which mechanical properties are susceptible to hydrogen-induced embrittlement. The results showed that hydrogen increases strength compared to the non-charged condition; however, the deformation and area reduction percentage values increased, indicating that localized plasticity enhanced by hydrogen mechanisms is predominant, as confirmed by the surface fracture analysis. In the permeability test, the apparent hydrogen concentration showed a high hydrogen trap compared to similar steels with similar characteristics.

Graphical abstract