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We have improved an electron stimulated desorption (ESD) apparatus to obtain the time evolution of hydrogen permeation for cold-worked stainless steel. Hydrogen permeation through grain structures was visualized by using the operando hydrogen microscope combining ESD and hydrogen supply system. The diffusion coefficients in grains were calculated from time evolution curves of hydrogen permeation. Principal component analysis (PCA) of hydrogen maps was used to classify crystal grains by the degrees of hydrogen diffusion and permeation flux. Grain structures such as the ratio of austenite/martensite, crystallographic orientations and coherent/random grain boundaries were determined by electron backscatter diffraction (EBSD) analysis. The areas with high-speed and high flux permeation of hydrogen were characterized as smaller austenitic grains with grain boundaries. The usefulness of a combined ESD-PCA-EBSD analysis on hydrogen permeation in materials was demonstrated in the present study.

Rights:

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

Keyword: Hydrogen permeation, Hydrogen visualization, Hydrogen microscope

Date published: 2020-05-27

Publisher: Elsevier BV

Journal:

• APPLIED SURFACE SCIENCE (ISSN: 01694332) vol. 527 146710

Funding:

• JSPS 18H03849

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5354

First published URL: https://doi.org/10.1016/j.apsusc.2020.146710

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Updated at: 2025-03-04 16:30:31 +0900

Published on MDR: 2025-03-04 16:30:31 +0900