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    Rights statement: This is the author’s version of a work that was accepted for publication in Journal of Materials Science & Technology. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Materials Science & Technology, 33, 12, 2017 DOI: 10.1016/j.jmst.2017.09.011

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Hydrogen transport in metals: Integration of permeation, thermal desorption and degassing

Research output: Contribution to journalJournal articlepeer-review

Published
<mark>Journal publication date</mark>12/2017
<mark>Journal</mark>Journal of Materials Science and Technology
Issue number12
Volume33
Number of pages15
Pages (from-to)1433-1447
Publication StatusPublished
Early online date21/10/17
<mark>Original language</mark>English

Abstract

A modelling suite for hydrogen transport during electrochemical permeation, degassing and thermal desorption spectroscopy is presented. The approach is based on Fick's diffusion laws, where the initial concentration and diffusion coefficients depend on microstructure and charging conditions. The evolution equations are shown to reduce to classical models for hydrogen diffusion and thermal desorption spectroscopy. The number density of trapping sites is found to be proportional to the mean spacing of each microstructural feature, including dislocations, grain boundaries and various precipitates. The model is validated with several steel grades and polycrystalline nickel for a wide range of processing conditions and microstructures. A systematic study of the factors affecting hydrogen mobility in martensitic steels showed that dislocations control the effective diffusion coefficient of hydrogen. However, they also release hydrogen into the lattice more rapidly than other kind of traps. It is suggested that these effects contribute to the increased susceptibility to hydrogen embrittlement in martensitic and other high–strength steels. These results show that the methodology can be employed as a tool for alloy and process design, and that dislocation kinematics play a crucial role in such design.

Bibliographic note

This is the author’s version of a work that was accepted for publication in Journal of Materials Science & Technology. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Materials Science & Technology, 33, 12, 2017 DOI: 10.1016/j.jmst.2017.09.011