Prediction model for crack sensitive temperature region and phase fractions of slab under continuous casting cooling rates based on finite number of experiments

Effect Mechanism of α-Ferrite Sustained Precipitation on High-Temperature Properties in Continuous Casting for Peritectic Steel

“…Generally, the austenite phase transition is accompanied by a significant volume expansion associated with changes in the lattice structure [8,30,39]. This significant dimensional change on the dilation curve can be observable.…”

“…In our previous study, to achieve more accurate phase fractions at specific temperatures during the austenite phase transition process, we converted the dilation curves into linear thermal expansion coefficient (LTEC) curves. Subsequently, we employed the peak separation method to quantitatively characterize the changes in each phase fraction [30,40]. The linear thermal expansion coefficient (β) can be quantitatively calculated from Equation (2) based on the measured expansion curves:…”

“…Overall, these studies primarily focus on the effect of the formation and distribution of film-like ferrite on hot ductility in the pre-austenite phase transition stage, with fewer quantitative descriptions of the properties evolution during the whole α-ferrite precipitation advancement process. Actually, as the austenite phase transition process advances, the microstructure of the as-cast slab undergoes complex changes such as the generation of new phases, the depletion of the original phases, and the change in the crystal structure of the matrix phases [30,31], which has a substantial impact on the properties [32,33]. Furthermore, avoiding cracks is only a basic requirement for high-quality steel products, and further improvements in strength and toughness should be considered as a new aim.…”