Study of Diffusible Behavior of Hydrogen in First Generation Advanced High Strength Steels

This study deals with microstructural influence on the H permeation behavior of Dual-Phase (DP) and Complex Phase (CP) steels using electrochemical permeation studies. The H diffusion coefficients in DP steels (DP800: 1.65 × 10−10 m2·s−1, DP1000: 1.58 × 10−10 m2·s−1) are half of that found in CP ste...

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Bibliographic Details
Published in:Metals (Basel ) 2021-05, Vol.11 (5), p.782
Main Authors: Mallick, Dwaipayan, Mary, Nicolas, Raja, V. S., Normand, Bernard
Format: Article
Language:English
Subjects:
activation energy
Corrosion resistance
CP steel
diffusion coefficient
DP steel
Dual phase steels
Electrodes
Electrolytes
Engineering Sciences
H concentration
High strength steels
Hydrogen
Mechanical properties
Microstructure
Penetration
Steel
Tensile strength
trap density
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Summary:This study deals with microstructural influence on the H permeation behavior of Dual-Phase (DP) and Complex Phase (CP) steels using electrochemical permeation studies. The H diffusion coefficients in DP steels (DP800: 1.65 × 10−10 m2·s−1, DP1000: 1.58 × 10−10 m2·s−1) are half of that found in CP steels (3.07 × 10−10 m2·s−1).The banded microstructure along the specimen thickness and higher C content of the DP led to high H diffusivity of DP steels. The lower total H concentration along with a higher fraction of H was present in the stronger traps in CP steels suggest a better HE resistance of this steel. The H distribution in the specimens was non-uniform, with a higher H concentration speculated near the charging surface.
ISSN:2075-4701
2075-4701
DOI:10.3390/met11050782