Evaluation of hydrogen interactions with defects induced by deformation in the duplex stainless steel microstructure: An internal friction study

Liese Vandewalle, Lisa Claeys, Milan J. Konstantinović, Kim Verbeken, Tom Depover

    Research outputpeer-review


    Despite their good corrosion resistance and optimal mechanical properties, duplex stainless steels are affected by hydrogen embrittlement. Therefore, understanding the hydrogen-defect interactions in these steels is crucial. This study uses internal friction to evaluate the interactions of hydrogen with microstructural defects. Analysis of the internal friction spectra of the steels subjected to straining and hydrogen charging, together with thorough microstructural characterization, gives new insights in hydrogen interactions with defects present in the different phases, i.e. ferrite (body centered cubic) and austenite (face centered cubic). While no significant effect of tensile deformation can be observed by thermal desorption spectroscopy, the internal friction spectra show a clear influence of the presence of defects. Detailed analysis of these spectra reveals the interactions in the austenite as dominant, while no indications for hydrogen-dislocation interactions in ferrite are observed. This can be related to limited trapping in ferrite due to the austenite sink action or to limited dislocation formation in ferrite. Indications for hydrogen interactions with dislocations in the austenite are found, possibly suggesting enhanced dislocation mobility when surrounded by hydrogen. Moreover, a pronounced influence of hydrogen charging on the vacancy cluster related peaks is observed, indicating strong interactions between hydrogen and vacancy clusters in austenite. This can be put in contrast to behavior of pure ferritic steels, where dislocations provided the strongest hydrogen interactions. As these specific defects are of primary interest in the hydrogen embrittlement mechanisms, internal friction is concluded to provide important unique insights in hydrogen-defect interactions, even for complicated multiphase microstructures.

    Original languageEnglish
    Article number119800
    Number of pages14
    JournalActa Materialia
    StatePublished - Apr 2024


    The authors wish to thank Margo Cauwels for her help and valuable feedback regarding the EBSD experiments and analysis of TDS measurements. Also they would like to acknowledge Liesbet Deconinck and Mohammadhossein Barata Rizi for their help with the XRD measurements and analysis. Furthermore, the authors would like to thank the doctoral fellowship of the Research Foundation – Flanders (FWO) via grant 11F6522N and the FWO project grant number G069721N as well as the Special Research Fund (BOF), UGent (grants BOF15/BAS/062, BOF/GOA/026, and BOF20/BAS/121) for support.

    FundersFunder number
    Fonds Wetenschappelijk OnderzoekG069721N, 11F6522N
    Universiteit GentBOF/GOA/026, BOF20/BAS/121, BOF15/BAS/062

      ASJC Scopus subject areas

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

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