Hydrogen trapping in X70 structural pipeline steel and weldments

Jean Gabriel Sezgin, Hallvard G. Fjær, Hisao Matsunaga, Junichiro Yamabe, Vigdis Oldeng

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Diffusion measurements and thermal desorption measurements have been performed on a X70 pipeline steel, in as received and normalized and quenched condition, after being hydrogen charged for 200 h at 100 MPa hydrogen gas pressure and 85℃. Numerical simulations based on the assumption of thermodynamic equilibrium were performed, aiming to compare the trapping energies when fitting to the TDS spectra. TDS experiments revealed a reversible trap site with activation energy of 26.2 kJ.mol-1. Irreversible trap sites with an activation energy of >100 kJ.mol-1 were observed from both as-received and heat-treated condition. In contrast, a reversible trap site with an activation energy of 49.2 kJ.mol-1 was observed only from the heat-treated condition. The numerical modelling based on the assumption of equilibrium between hydrogen in traps and hydrogen in lattice is seen to provide a good fit to the experimental data.

Original languageEnglish
Title of host publicationProceedings of the 28th International Ocean and Polar Engineering Conference, ISOPE 2018
PublisherInternational Society of Offshore and Polar Engineers
Pages228-235
Number of pages8
ISBN (Print)9781880653876
Publication statusPublished - Jan 1 2018
Event28th International Ocean and Polar Engineering Conference, ISOPE 2018 - Sapporo, Japan
Duration: Jun 10 2018Jun 15 2018

Publication series

NameProceedings of the International Offshore and Polar Engineering Conference
Volume2018-June
ISSN (Print)1098-6189
ISSN (Electronic)1555-1792

Other

Other28th International Ocean and Polar Engineering Conference, ISOPE 2018
CountryJapan
CitySapporo
Period6/10/186/15/18

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All Science Journal Classification (ASJC) codes

  • Energy Engineering and Power Technology
  • Ocean Engineering
  • Mechanical Engineering

Cite this

Sezgin, J. G., Fjær, H. G., Matsunaga, H., Yamabe, J., & Oldeng, V. (2018). Hydrogen trapping in X70 structural pipeline steel and weldments. In Proceedings of the 28th International Ocean and Polar Engineering Conference, ISOPE 2018 (pp. 228-235). (Proceedings of the International Offshore and Polar Engineering Conference; Vol. 2018-June). International Society of Offshore and Polar Engineers.