Hydrogen-induced intergranular failure of iron

Shuai Wang, May L. Martin, Petros Athanasios Sofronis, Somei Ohnuki, Naoyuki Hashimoto, Ian M. Robertson

Research output: Contribution to journalArticle

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Abstract

The hydrogen embrittlement of a commercial-grade pure iron was examined by using repeated stress-relaxation tests under simultaneous cathodic hydrogen charging. The hydrogen-charged iron, containing an estimated 25.8 appm H, fractured after repeated transients, with a total strain of ∼5%. The fracture mode was intergranular. Thermal activation measurements show a decrease in activation volume and free energy, which is consistent with hydrogen enhancing the dislocation velocity. The microstructure beneath the intergranular facets displays a dislocation cell structure more complex than expected for intergranular fracture and this strain-to-failure. It is proposed that hydrogen accelerates the evolution of the dislocation microstructure through the hydrogen-enhanced plasticity mechanism and this work-hardening of the matrix along with the attendant hydrogen concentration at the grain boundaries are crucial steps in causing the observed hydrogen-induced intergranular failure.

Original languageEnglish
Pages (from-to)275-282
Number of pages8
JournalActa Materialia
Volume69
DOIs
Publication statusPublished - Jan 1 2014

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Hydrogen
Iron
Chemical activation
Microstructure
Hydrogen embrittlement
Stress relaxation
Strain hardening
Free energy
Plasticity
Grain boundaries

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

Cite this

Wang, S., Martin, M. L., Sofronis, P. A., Ohnuki, S., Hashimoto, N., & Robertson, I. M. (2014). Hydrogen-induced intergranular failure of iron. Acta Materialia, 69, 275-282. https://doi.org/10.1016/j.actamat.2014.01.060

Hydrogen-induced intergranular failure of iron. / Wang, Shuai; Martin, May L.; Sofronis, Petros Athanasios; Ohnuki, Somei; Hashimoto, Naoyuki; Robertson, Ian M.

In: Acta Materialia, Vol. 69, 01.01.2014, p. 275-282.

Research output: Contribution to journalArticle

Wang, S, Martin, ML, Sofronis, PA, Ohnuki, S, Hashimoto, N & Robertson, IM 2014, 'Hydrogen-induced intergranular failure of iron', Acta Materialia, vol. 69, pp. 275-282. https://doi.org/10.1016/j.actamat.2014.01.060
Wang S, Martin ML, Sofronis PA, Ohnuki S, Hashimoto N, Robertson IM. Hydrogen-induced intergranular failure of iron. Acta Materialia. 2014 Jan 1;69:275-282. https://doi.org/10.1016/j.actamat.2014.01.060
Wang, Shuai ; Martin, May L. ; Sofronis, Petros Athanasios ; Ohnuki, Somei ; Hashimoto, Naoyuki ; Robertson, Ian M. / Hydrogen-induced intergranular failure of iron. In: Acta Materialia. 2014 ; Vol. 69. pp. 275-282.
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