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<p>AHSS are widely used in the automotive sector due to their balance of mechanical properties. Medium-Mn steels (4–12 wt%) are notable for activating plasticity mechanisms such as TWIP and TRIP, thereby enhancing energy absorption and stress distribution. However, their behavior in hydrogen-rich environments remains a challenge. This study investigated the correlation between temperature and IA time, and their effects on the microstructural features of 9.23% Mn steel and on hydrogen permeability parameters. The steel was hot-rolled and annealed at 680&#xa0;°C with soaking times of 10 and 20&#xa0;min. Hydrogen permeability was measured using a Devanathan-Stachurski double-cell. Main results showed that a soaking time of 20&#xa0;min promoted a lower γr fraction (17% vol.) and reduced stability, leading to increased hydrogen permeability, whereas a shorter time resulted in a finer, more stable microstructure with 21% vol. γ<sub>r</sub> and lower permeability. Therefore, 680&#xa0;°C-10&#xa0;min was the most susceptible condition to embrittlement.</p> Graphical abstract <p></p>

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Effect of soaking time during intercritical annealing on hydrogen permeability in a third-generation medium-Mn AHSS

  • 期刊论文

  • 发表日期：

    2026年1月21日

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  • L. Ramos-Pintor,
  • J. C. Villalobos,
  • P. Garnica-González,
  • A. J. Bocanegra-Hueramo,
  • Y. Solana-Reyes,
  • O. Hernández-Cristobal

摘要

AHSS are widely used in the automotive sector due to their balance of mechanical properties. Medium-Mn steels (4–12 wt%) are notable for activating plasticity mechanisms such as TWIP and TRIP, thereby enhancing energy absorption and stress distribution. However, their behavior in hydrogen-rich environments remains a challenge. This study investigated the correlation between temperature and IA time, and their effects on the microstructural features of 9.23% Mn steel and on hydrogen permeability parameters. The steel was hot-rolled and annealed at 680 °C with soaking times of 10 and 20 min. Hydrogen permeability was measured using a Devanathan-Stachurski double-cell. Main results showed that a soaking time of 20 min promoted a lower γr fraction (17% vol.) and reduced stability, leading to increased hydrogen permeability, whereas a shorter time resulted in a finer, more stable microstructure with 21% vol. γr and lower permeability. Therefore, 680 °C-10 min was the most susceptible condition to embrittlement.

Graphical abstract