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The influence of prior austenite grain (PAG) size ranging from 6 to 90 μm on the fatigue crack growth (FCG) of a tempered 0.41%C lath martensitic steel was investigated in a 90 MPa H2 gas environment at ambient temperature. Under the presence of H, severe FCG accelerations accompanying intergranular (IG) cracking along PAG boundaries as well as quasi-cleavage (QC) fracture along martensite block boundaries and {011} crystallographic planes were systematically found. Smaller PAG mitigated the acceleration at a relatively high-stress intensity via suppressing IG cracking. However, PAG refinement instead escalated the acceleration at a low-stress intensity factor where QC facture prevailed. This inverse grain size effect was discussed in terms of the plasticity criterion in triggering QC and its possible dependence on the microstructural length scale.

権利情報:

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

キーワード: Hydrogen embrittlement, Fatigue, Fracture, Martensitic steels, Grain size

刊行年月日: 2023-09-09

出版者: Elsevier BV

掲載誌:

• International Journal of Hydrogen Energy (ISSN: 03603199) vol. 50,Part A p. 108-115

研究助成金:

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4648

公開URL: https://doi.org/10.1016/j.ijhydene.2023.08.317

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更新時刻: 2025-09-09 08:30:40 +0900

MDRでの公開時刻: 2025-09-09 08:17:59 +0900