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説明:

The influence of hydrogen on fatigue crack growth (FCG) was investigated in 90 MPa hydrogen gas using a 3Mn-0.2C martensitic steel with a tensile strength of 1500 MPa. Surprisingly, this steel exhibited significant crack closure in hydrogen gas under specific loading conditions, resulting in considerably lower FCG rates compared to those in air. The roughness- and plasticity-induced crack closure markedly retarded the FCG in hydrogen in a relatively low stress intensity factor regime. However, intrinsic FCG resistance, excluding the effect of crack closure, was indeed degraded by hydrogen. Further analysis revealed that the reduction in cohesive strength of block boundaries depended on the plastic zone size and the inclination angle between the longitudinal axis of the blocks and the macroscopic FCG direction. Consequently, hydrogen-enhanced plasticity-mediated decohesion led to cycle-dependent acceleration of FCG, even in such high-strength steel under high-pressure hydrogen environments.

権利情報:

• Creative Commons BY-NC Attribution-NonCommercial 4.0 International
  

キーワード: Hydrogen embrittlement, Fatigue crack growth, Martensite Steel, Medium manganese low-carbon steel, Crack closure

刊行年月日: 2025-08-11

出版者: Elsevier BV

掲載誌:

• International Journal of Fatigue (ISSN: 01421123) vol. 202 109235

研究助成金:

• Government of Japan Ministry of Education Culture Sports Science and Technology JPMXP1122684766

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1016/j.ijfatigue.2025.109235

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更新時刻: 2026-10-16 10:16:29 +0900

MDRでの公開時刻: 2026-10-16 12:33:04 +0900