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In this study, the local plasticity accompanying hydrogen-related fracture in a low-carbon martensitic steel was quantitatively investigated by correlative microscopy analysis combining digital image correlation technique and electron backscatter diffraction. The results revealed that strain localization occurred mainly in the bulk of martensite blocks and at prior austenite grain boundaries, both with and without the presence of hydrogen. Moreover, hydrogen enhanced strain localization during deformation and facilitated crack nucleation and propagation. The quantitative analysis showed that the hydrogen-related quasi-cleavage cracking was closely related to the local plastic deformation, and increasing hydrogen content decreased the local strain level required for quasi-cleavage cracking. It was found that strain localization also occurred around the intergranular cracks, suggesting that hydrogen-induced intergranular cracking was not a classical simple decohesion process and strain localization was involved in the sequence of hydrogen-induced intergranular cracking. These findings shed light on the understanding of the intrinsic nature of hydrogen embrittlement.

権利情報:

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

キーワード: Hydrogen embrittlement, Martensite, Local plasticity, Electron backscatter diffraction (EBSD), Digital image correlation (DIC)

刊行年月日: 2023-11-08

出版者: Elsevier BV

掲載誌:

• International Journal of Hydrogen Energy (ISSN: 03603199) vol. 50 p. 333-341

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
• Ministry of Education, Culture, Sports, Science and Technology JPMXP1122684766
• Japan Science and Technology Agency
• Iketani Science and Technology Foundation 0351190-A
• Precursory Research for Embryonic Science and Technology JPMJPR2096

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1016/j.ijhydene.2023.10.273

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更新時刻: 2024-11-21 16:31:07 +0900

MDRでの公開時刻: 2024-11-21 16:31:08 +0900