Metastable precursor structures in hydrogen-infused super duplex stainless steel microstructure - An operando diffraction experiment

Örnek C., Larsson A., Harlow G. S., Zhang F., Kroll R., Carla F., ...More

CORROSION SCIENCE, vol.176, 2020 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 176
  • Publication Date: 2020
  • Doi Number: 10.1016/j.corsci.2020.109021
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Aerospace Database, Applied Science & Technology Source, Aqualine, Aquatic Science & Fisheries Abstracts (ASFA), Chimica, Communication Abstracts, Compendex, Computer & Applied Sciences, Environment Index, INSPEC, Metadex, Civil Engineering Abstracts
  • Istanbul Technical University Affiliated: Yes


We report the evolution of metastable precursor structures during hydrogen infusion in the near-surface region of a super duplex stainless steel. Grazing-incidence x-ray diffraction was employed to monitor, operando, the lattice degradation of the austenite and ferrite phases. Electrochemical hydrogen charging resulted in the splitting of the diffraction peaks of the austenite phase, suggesting the evolution of a metastable precursor structure. This may be explained by the formation of quasi-hydrides, which convert back into the austenite parent structure during hydrogen effusion. The ferrite showed less lattice deformation than the austenite and no phase transformation.