In situ observations of phase transformation during C-Mn-Al steel weld solidification

Zhang, X. F.; Terasaki, H. and Komizo, Y. (2013). In situ observations of phase transformation during C-Mn-Al steel weld solidification. Materials Science and Technology, 29(11) pp. 1363–1372.



In order to better understand the microstructural evolution in steel welds, in-situ experiments using time-resolved X-ray diffraction (TRXRD) and laser scanning confocal microscopy (LSCM) are performed and the phase transformations that occur during welding of C–Mn–Al steels are directly observed. Ferrite and austenite phases are identified and quantified in the fusion zone (FZ) using the real time TRXRD and LSCM data. The results show non-equilibrium peritectic transition during rapid cooling, in contrast to the equilibrium δ-ferrite solidification that occurs under slow cooling conditions. Austenite nucleates along δ-ferrite grain boundaries during the δ→γ transformation, whereas during the γ→α transformation, the microstructures change from Widmanstatten ferrite (WF) to intragranular bainitic ferrite in the rapidly and slowly cooled welds, respectively. Using these real time observations, important kinetic information about phase transformations during steel weld solidification can be determined.

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