Sammendrag
A gas quenching device was successfully developed and fitted into a
field emission scanning electron microscope (FESEM) together with a
purposely build hot stage. In situ heating and quenching were combined
with electron backscatter diffraction (EBSD) measurements in order to
study the development in the microstructure of arctic steel during a
simulated second weld cycle. EBSD measurements were conducted on
a one cycle weld simulated arctic steel sample before heating, at 800°C
and after gas quenching. During quenching, islands of austenite (FCC)
observed at elevated temperatures transformed into a BCC structure,
assumed to be martensite. It was also found an increase in diffraction
pattern quality during heating and after quenching, probably due to
sample lattice stress relief or evaporation of the contamination layer.
Vis fullstendig beskrivelse
