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<p>This study explores the impact of hydrogen permeation on the deformation response of X65 linepipe steel with ferrite-pearlite and bainite-ferrite microstructures. Hydrogen entrapment was induced by 24-h electrochemical charging in NaOH. Despite similar permeation levels, bainite-ferrite exhibited significantly higher hydrogen entrapment due to matrix strain, high dislocation density, and trapping at low-angle and ∑3 boundaries. In contrast, ferrite-pearlite showed lower entrapment, primarily influenced by coherent NbC microalloying precipitates acting as reversible hydrogen traps. The hydrogen-induced degradation severely impacted tensile toughness, with bainite-ferrite experiencing an ~ 84% reduction, compared to ~ 64% in ferrite-pearlite. The results indicate that hydrogen embrittlement is governed more by dislocation density and low-angle grain boundaries within specific texture components than by their overall volume fraction. These findings provide insights into the role of microstructural features in hydrogen trapping and embrittlement, crucial for improving the performance of pipeline steels in hydrogen-rich environments.</p>

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Effect of Hydrogen Permeation on the Mechanical Responses of a X65 Linepipe Steel with Varying Microstructures

  • 期刊论文

  • 发表日期：

    2026年3月27日

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  • Palash Chandra Maity,
  • Pranabananda Modak,
  • Kapil Dev Sharma,
  • Sagar Chauhan,
  • Surojit Ghosh,
  • Anish Karmakar

摘要

This study explores the impact of hydrogen permeation on the deformation response of X65 linepipe steel with ferrite-pearlite and bainite-ferrite microstructures. Hydrogen entrapment was induced by 24-h electrochemical charging in NaOH. Despite similar permeation levels, bainite-ferrite exhibited significantly higher hydrogen entrapment due to matrix strain, high dislocation density, and trapping at low-angle and ∑3 boundaries. In contrast, ferrite-pearlite showed lower entrapment, primarily influenced by coherent NbC microalloying precipitates acting as reversible hydrogen traps. The hydrogen-induced degradation severely impacted tensile toughness, with bainite-ferrite experiencing an ~ 84% reduction, compared to ~ 64% in ferrite-pearlite. The results indicate that hydrogen embrittlement is governed more by dislocation density and low-angle grain boundaries within specific texture components than by their overall volume fraction. These findings provide insights into the role of microstructural features in hydrogen trapping and embrittlement, crucial for improving the performance of pipeline steels in hydrogen-rich environments.