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Improving hydrogen embrittlement resistance is a prerequisite for expanding the application of high-strength steels. A high-strength deformed pearlitic steel exhibits excellent hydrogen embrittlement resistance presum- ably because strong hydrogen trapping sites induced by deformation prevent hydrogen accumulation at potential crack initiation sites. This work reports the conclusive identification of the strong hydrogen trapping site in the deformed pearlitic steels. Thermal desorption spectroscopy showed a distinct hydrogen desorption peak at high temperature of ~ 600 K solely in the deformed pearlite. Scanning transmission electron microscopy and atom probe tomography analyses revealed that the deformation resulted in strain localization at the ferrite/cementite interfaces, together with the formation of a large number of dislocations, leading to the strong segregation of deuterium, a natural isotope of hydrogen, at the interface. Therefore, hydrogen trapping in the deformed pearlitic steels is attributed to the strained ferrite/cementite interface.

Rights:

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

Keyword: pearlitic steel, deformation, hydrogen, trapping site, atom probe tomography

Date published: 2023-11-16

Publisher: Elsevier BV

Journal:

• Scripta Materialia (ISSN: 13596462) vol. 241 115859

Funding:

• JFE 21st Century Foundation (JFE21世紀財団　技術研究助成)
• Ministry of Education, Culture, Sports, Science and Technology JPMXP1122684766 (Data Creation and Utilization-Type Material Research and Development Project)

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5236

First published URL: https://doi.org/10.1016/j.scriptamat.2023.115859

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Updated at: 2025-12-19 16:30:06 +0900

Published on MDR: 2025-12-19 14:11:29 +0900