Experimental study of hydrogen trapping by carbides in low alloyed steels using Atom Probe Tomography
Typ
Examensarbete för masterexamen
Master's Thesis
Master's Thesis
Program
Materials engineering (MPAEM), MSc
Publicerad
2024
Författare
Moritz, Ludwig
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
Hydrogen embrittlement (HE) of high-strength low-alloy (HSLA) steels is a big
problem. Several options are known to prevent/delay the embrittlement of the
steels. One option is to trap the hydrogen at or inside the carbides. This could
be interpreted as an energetic interaction, as the nano-sized carbides contribute to
the mechanical strength of the material. This work investigates three different low
alloyed steels, named in the thesis Steel-1, Ti-steel and V-steel. For the electrochemical
D loading process, a 0.1M NaOH in D2O is used. The specimens are transferred
at room temperature (RT) to the atom probe (AP). Crystallographic calibration
was carried out for all measurements. For Steel-1 in the quenched state, no trapping
can be seen. For the annealed specimens, the trapping capability can be argued.
The Ti- and V-steel show D trapping. Besides the standard measurement, a room
temperature degassing experiment was carried out for the Ti- and V-steel to get a
qualitative insight into the strength of the traps.
Beskrivning
Ämne/nyckelord
Atom Probe Tomography, Hydrogen Embrittlement, High-strength lowalloy steel, Hydrogen traps, Carbides