Hydrogen trapping and embrittlement of titanium- and vanadium carbide-containing steels after high-temperature hydrogen charging

This work studies the effect of TiC and VC precipitate sizes on hydrogen trapping and embrittlement. Two experimental ferritic HSLA steels containing either TiC or VC carbides for precipitation strengthening are annealed in nitrogen and hydrogen gas. This results in a hydrogen uptake of up to 0.91 a...

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Bibliographic Details
Published inJournal of materials science Vol. 59; no. 18; pp. 7873 - 7892
Main Authors Boot, Tim, Suresh Kumar, Athira, Eswara, Santhana, Kömmelt, Pascal, Böttger, Amarante, Popovich, Vera
Format Journal Article
LanguageEnglish
Published New York Springer US 01.05.2024
Springer Nature B.V
Subjects
Carbon
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Crystallography and Scattering Methods
Ferritic stainless steels
Heat resistant steels
High strength low alloy steels
High temperature
Hydrogen
Hydrogen charging
Hydrogen embrittlement
Materials Science
Metals & Corrosion
Misfit dislocations
Polymer Sciences
Precipitates
Precipitation hardening
Solid Mechanics
Strengthening
Titanium carbide
Trapping
Vanadium carbide
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Summary:This work studies the effect of TiC and VC precipitate sizes on hydrogen trapping and embrittlement. Two experimental ferritic HSLA steels containing either TiC or VC carbides for precipitation strengthening are annealed in nitrogen and hydrogen gas. This results in a hydrogen uptake of up to 0.91 and 0.44 wppm in the TiC and VC steels, respectively. TEM and TDS analysis indicate that semi-coherent TiC particles trap hydrogen in misfit dislocations with an activation energy of 43 kJ/mol. Coherent VC particles are suggested to trap hydrogen in interface carbon vacancies, with an energy between 53 and 72 kJ/mol. Carbon vacancies are the likely trapping site in incoherent precipitates, where SIMS imaging confirms that incoherent TiC precipitates trap preferentially near the interface, whereas incoherent VC precipitates trap throughout their bulk. Neither alloy is embrittled in SSRT tests after hydrogen absorption, which shows that these precipitates can be used as both a hydrogen sink and a strengthening mechanism in steels. Graphical abstract
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-024-09611-7