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The effect of microstructure on hydrogen permeability of high strength steels
Author(s) -
Rudomilova Darya,
Prošek Tomáš,
Salvetr Pavel,
Knaislová Anna,
Novák Pavel,
Kodým Roman,
SchimoAichhorn Gabriela,
Muhr Andreas,
Duchaczek Hubert,
Luckeneder Gerald
Publication year - 2020
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.201911357
Subject(s) - materials science , bainite , microstructure , austenite , thermal diffusivity , martensite , ferrite (magnet) , metallurgy , hydrogen , grain size , trip steel , permeability (electromagnetism) , diffusion , permeation , composite material , thermodynamics , chemistry , biochemistry , physics , organic chemistry , membrane
Hydrogen diffusivity and trapping have been studied in two advanced high strength steel grades and model samples using electrochemical permeation test. Microstructures of CP1000 and DP1000 steels consist of ferrite, martensite and a small fraction of retained austenite. In addition, bainite is present in CP1000. Model phases with predominance of a particular phase have been prepared by specific heat treatment. DP1000 has shown the lowest diffusivity among all materials, while ferritic model sample has shown the highest. Differences in hydrogen diffusion coefficient values are linked to trapping microstructural characteristics and grain size.