The solidification process of AISI 304 stainless steel during cooling at a rate of 005 K/s has been observed in situ using a confocal scanning laser microscope (CSLM). The results show that the δ phase appeared first in liquid steel, as the temperature decreased, the γ phase precipitated prior at δgrain boundary at 1 4522 ℃, the liquid steel disappeared at 1 4313 ℃, and then the γ phase precipitated on the δ ferrite. Based on the ScheilGulliver solidification model, the solidification processes of AISI 304 stainless steel are simulated using the Scheil model in ThermoCalc, and the simulation results agree well with the results observed in the experiment.
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