The causation of hydrogen embrittlement of duplex stainless steel: Phase instability of the austenite phase and ductile-to-brittle transition of the ferrite phase – Synergy between experiments and modelling

DOI: 10.1016/j.corsci.2023.111140

Authors: Cem Ornek (Istanbul Technical University; Leibniz-Institut für Werkstofforientierte Technologien – IWT) , Mubashir Mansoor (Istanbul Technical University) , Alfred Larsson (Lund University) , Fan Zhang (University of Sussex) , Gary S. Harlow (Malmö University; MaxIV, Lund University) , Robin Kroll (University of Manchester) , Francesco Carla (Diamond Light Source) , Hadeel Hussain (Diamond Light Source) , Bora Derin (Istanbul Technical University) , Ulf Kivisäkk (Alleima) , Dirk L. Engelberg (University of Manchester) , Edvin Lundgren (Lund University) , Jinshan Pan (KTH Royal Institute of Technology)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Corrosion Science , VOL 217

State: Published (Approved)
Published: June 2023
Diamond Proposal Number(s): 23388

Abstract: Various mechanisms have been proposed for hydrogen embrittlement of duplex stainless steel, but the causation of hydrogen-induced material degradation has remained unclear. This work shows that phase instability (decomposition) of the austenite phase and ductile-to-brittle transition of the ferrite phase precedes hydrogen embrittlement. In-situ diffraction measurements revealed that Ni-rich sites of the austenite phase decompose into metastable hydrides. Hydride formation is possible by increasing the hydrogen chemical potential during electrochemical charging and low defect formation energy of hydrogen interstitials. Our findings demonstrate that hydrogen embrittlement can only be understood if measured in situ and in real-time during the embrittlement process.

Journal Keywords: Super duplex stainless steel; Hydrogen embrittlement; High-energy X-ray diffraction; Density-functional theory; Hydride; FactSage

Diamond Keywords: Alloys

Subject Areas: Materials, Chemistry


Instruments: I07-Surface & interface diffraction

Added On: 30/03/2023 11:24

Discipline Tags:

Physical Chemistry Chemistry Materials Science Metallurgy

Technical Tags:

Diffraction Grazing Incidence X-ray Diffraction (GIXD)