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

DOI: 10.1016/j.corsci.2020.109021 DOI Help

Authors: Cem Ornek (Istanbul Technical University) , Alfred Larsson (Lund University) , Gary S. Harlow (University of Copenhagen) , Fan Zhang (KTH Royal Institute of Technology) , Robin Kroll (University of Manchester) , Francesco Carla (Diamond Light Source) , Hadeel Hussain (Sandvik Materials Technology) , Ulf Kivisäkk (Sandvik Materials Technology) , Dirk L. Engelberg (University of Manchester) , Edvin Lundgren (Lund University) , Jinshan Pan (KTH Royal Institute of Technology)
Co-authored by industrial partner: Yes

Type: Journal Paper
Journal: Corrosion Science

State: Published (Approved)
Published: September 2020
Diamond Proposal Number(s): 23388

Open Access Open Access

Abstract: 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.

Journal Keywords: Grazing-incidence x-ray diffraction (GIXRD); synchrotron radiation; duplex stainless steels; hydride; hydrogen embrittlement

Subject Areas: Materials

Instruments: I07-Surface & interface diffraction


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