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Hydrogen trapping in X70 structural pipeline steel and weldments

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°C. 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.
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Category

Academic chapter

Language

English

Author(s)

  • Jean-Gabriel Sezgin
  • Hallvard Gustav Fjær
  • Hisao Matsunaga
  • Junichiro Yamabe
  • Vigdis Olden

Affiliation

  • SINTEF Industry / Materials and Nanotechnology
  • Kyushu University
  • Institute for Energy Technology

Year

2018

Publisher

International Society of Offshore & Polar Engineers

Book

The Proceedings of The Twenty-eighth (2018) International OCEAN AND POLAR ENGINEERING CONFERENCE, ISOPE 2018

ISBN

9781880653876

Page(s)

228 - 235

View this publication at Norwegian Research Information Repository