Characterization of hydrogen traps in a co-precipitation steel investigated by atom probe experiments without cryogenic transfer
Journal article, 2024

Hydrogen (H) embrittlement in high-strength steels can be mitigated by introducing H traps into the microstructure. The co-precipitation model steel in this work contains intermetallic ß-NiAl and secondary Cr-carbides, which provide abundant trapping sites. Needle-shaped specimens are prepared for atom probe tomography (APT) and electro-chemically charged in a solution of 0.1 M NaOH in D2O to introduce deuterium (D). D is located at the finely dispersed Cr-carbides even after specimen transfer at room temperature (RT), which shows that nano-sized Cr-carbides are strong H traps. This is in contrast to previous studies of weak traps where cryogenic transfer was needed to detect any D.

Hydrogen trapping

Atom probe tomography



Severin Jakob

Chalmers, Physics, Microstructure Physics

Mohammad Sattari

Chalmers, Physics, Microstructure Physics

Birhan Sefer

Group of Corrosion and Hydrogen Embrittlement

S. W. Ooi

Ovako Ab

Ovako Corporate R&D

Mattias Thuvander

Chalmers, Physics, Microstructure Physics

Scripta Materialia

1359-6462 (ISSN)

Vol. 243 115963

Hydrogen trapping by carbides in steel

Swedish Research Council (VR) (2021-05072), 2021-12-01 -- 2025-11-30.

Subject Categories

Energy Engineering



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2/2/2024 8