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Thermal Desorption Spectroscopy Evaluation of the Hydrogen-Trapping Capacity of NbC and NbN Precipitates

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Abstract

In the current study, ferritic steels containing NbC or NbN precipitates were investigated. The materials were subjected to various heat treatments, giving rise to different precipitate size distributions as determined by transmission electron microscopy. Both NbC and NbN precipitates act as hydrogen traps. The steels were hydrogen charged both electrochemically and/or from the gaseous hydrogen source, followed by multiple thermal desorption spectroscopy (TDS) measurements. Electrochemical charging gave rise to a low-temperature peak [323 K to 523 K (50 °C to 250 °C)], originating from the hydrogen trapped near grain boundaries, with activation energy ranging between 24 and 33 kJ/mol, and at small NbC (39 to 48 kJ/mol) or NbN precipitates (23 to 24 kJ/mol). Gaseous charging caused a high-temperature TDS peak [723 K to 923 K (450 °C to 650 °C)], which was attributed to the presence of incoherent precipitates. The activation energy for NbC precipitates, charged in a hydrogen atmosphere, ranged between 63 and 68 kJ/mol and between 100 and 143 kJ/mol for NbN precipitates.

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Acknowledgments

The authors wish to thank the Special Research Fund (BOF), Ghent University (BOF10/ZAP/121), and the Agency for Innovation by Science and Technology in Flanders (IWT) for support (Project nr SB111205). The authors also acknowledge the technicians and staff working at the hydrogen laboratory at OCAS (ArcelorMittal Global R&D Gent) and the technical staff from the Department Materials Science and Engineering, Ghent University, for their help with the experiments and sample preparation.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Ghent University (UGent), Technologiepark 903, 9052, Ghent, Belgium

    Elien Wallaert, Tom Depover & Kim Verbeken

  2. ArcelorMittal Global R&D Gent, OCAS NV, Technologiepark 935, 9052, Zwijnaarde, Belgium

    Muhammad Arafin

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  1. Elien Wallaert
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  2. Tom Depover
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  3. Muhammad Arafin
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  4. Kim Verbeken
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Corresponding author

Correspondence to Kim Verbeken.

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Manuscript submitted September 6, 2013.

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Wallaert, E., Depover, T., Arafin, M. et al. Thermal Desorption Spectroscopy Evaluation of the Hydrogen-Trapping Capacity of NbC and NbN Precipitates. Metall Mater Trans A 45, 2412–2420 (2014). https://doi.org/10.1007/s11661-013-2181-1

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  • DOI: https://doi.org/10.1007/s11661-013-2181-1

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