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A typical hydrogen-related transgranular fracture, namely quasi-cleavage fracture, is usually accompanied by serrated markings on the resultant fracture surfaces in steels with body-centered cubic phases. The present paper investigated the microscopic three-dimensional morphology and crystallographic feature of serrated markings in a 2Mn-0.1C steel mainly composed of ferrite microstructure. The serrated markings corresponded to the corners of the step-like morphologies which consisted of microscopic {011} facets whose longitudinal directions were almost parallel to <011> or <211> direction. In addition, the microscopic {011} quasi-cleavage facets had the largest inclination angle from tensile axis among six crystallographically equivalent {011} planes, suggesting that resolved normal stress imposed on the {011} plane is an important factor for the hydrogen-related quasi-cleavage fracture. We propose that not only the slip deformation enhanced by hydrogen but also the coalescence of vacancies/voids induced by hydrogen-enhanced plastic deformation should be considered for understanding the mechanism of the hydrogen-related quasi-cleavage fracture along the {011} planes.

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• Creative Commons BY Attribution 4.0 International
  

Keyword: hydrogen embrittlement, ferritic steel, quasi-cleavage fracture, transmission electron microscopy (TEM), focused ion beam (FIB), three-dimensional morphology

Date published: 2024-09-01

Publisher: Iron and Steel Institute of Japan

Journal:

• Tetsu-to-Hagane (ISSN: 00211575) vol. 110 issue. 11 TETSU-2024-069

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Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.2355/tetsutohagane.tetsu-2024-069

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Updated at: 2024-09-03 12:30:16 +0900

Published on MDR: 2024-09-03 12:30:16 +0900