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

• 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.

Subject headings

TEKNIK OCH TEKNOLOGIER  -- Materialteknik -- Metallurgi och metalliska material (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Materials Engineering -- Metallurgy and Metallic Materials (hsv//eng)

NATURVETENSKAP  -- Kemi -- Materialkemi (hsv//swe)

NATURAL SCIENCES  -- Chemical Sciences -- Materials Chemistry (hsv//eng)

NATURVETENSKAP  -- Kemi -- Fysikalisk kemi (hsv//swe)

NATURAL SCIENCES  -- Chemical Sciences -- Physical Chemistry (hsv//eng)

NATURVETENSKAP  -- Kemi -- Oorganisk kemi (hsv//swe)

NATURAL SCIENCES  -- Chemical Sciences -- Inorganic Chemistry (hsv//eng)

Keyword

Duplex stainless steels

Grazing-incidence x-ray diffraction (GIXRD)

Hydride

Hydrogen embrittlement

Synchrotron radiation

Austenite

Ferrite

Photodegradation

Diffraction peaks

Electrochemical hydrogen charging

Grazing incidence X-ray diffraction

Hydrogen effusion

Lattice deformation

Metastable precursors

Near surface regions

Super duplex stainless steel

Duplex stainless steel

Duplex stainless steels

Grazing-incidence x-ray diffraction (GIXRD)

Hydride

Hydrogen embrittlement

Synchrotron radiation

Publication and Content Type

ref (subject category)

art (subject category)