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説明:

This study proposes a novel approach for architecting dual-phase heterostructure to enhance hydrogen embrittlement resistance in high-strength martensitic steels while maintaining a tensile strength above 1200 MPa. Through thermomechanical processing, a unique dual-phase structure was achieved, characterized by a refined martensitic substructure and dynamically transformed ferrite grains along the prior austenite grain boundaries (PAGBs). Lowering the deformation temperature increased the ferrite volume fraction and the coverage of PAGBs by fine ferrite grains, which consequently reduced the area fraction of hydrogen-related intergranular fracture. Notably, 60% compression at 700 °C completely suppressed hydrogen-related intergranular fracture, demonstrating an exceptional combination of strength and ductility even in hydrogen-charged state. The coverage of PAGBs by dynamically transformed ferrite was a critical factor in enhancing the hydrogen embrittlement resistance, with higher coverage correlating with improved hydrogen embrittlement resistance. These findings provide valuable microstructure design concepts for high-strength martensitic steels with superior hydrogen embrittlement resistance.

権利情報:

• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

キーワード: Hydrogen embrittlement, Intergranular fracture, Martensitic steel, Dynamic ferrite transformation, Thermomechanical processing

刊行年月日: 2025-04-16

出版者: Elsevier BV

掲載誌:

• Scripta Materialia (ISSN: 13596462) vol. 264 116711

研究助成金:

• Japan Society for the Promotion of Science JP22K18910
• Japan Society for the Promotion of Science JP23H01717
• Japan Society for the Promotion of Science JP23K13541
• Government of Japan Ministry of Education Culture Sports Science and Technology JPMXP1122684766
• Japan Society for the Promotion of Science JP24K01221

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1016/j.scriptamat.2025.116711

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更新時刻: 2025-06-13 10:12:04 +0900

MDRでの公開時刻: 2025-06-13 12:22:26 +0900