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

Co-precipitation

Author

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

DOI

10.1016/j.scriptamat.2023.115963

More information

Latest update

2/2/2024 8