Precipitation behavior of MnS during δ/γ transformation in Fe−Si alloys

Morphology of Solidification Structure and MnS Inclusion in High Carbon Steel Continuously Cast Bloom

“…Takada et al 23) investigated the morphology and distribution of sulfides in steel with different sulfur contents and proposed empirical relationships between the average size of Type I/Type II sulfides and solidification variables. Owing to difficulty in comprehensively characterizing the microstructure features of solidifying steel, Ueshima et al 24) simplified the dendrite morphology with a regular hexagonal transverse crosssection and preliminarily predicted the precipitation behavior of MnS during solidification of low carbon steels with δ/γ transformation. Imagumbai 9) proposed a novel idea of Solidification-Unit-Cell, primarily taking the relationships between the dendritic structure and morhplogy of Type II MnS inclusion into account, and quantitatively correlated the diameter of Type II MnS inclusion with solidification parameter.…”

“…In the present study, Ueshima's model 24) was adopted to describe the interdendritic microsegregation among hexagonal dendrites and MnS inclusions precipitation. Figure 3 shows the dendritic growth of continuously cast steel and only one-sixth cross section of the dendrite was choosen as calculation domain, and the length of the calculation domain, λ, is a half of the primary dendrite arm spacing (PDAS).…”

“…The equilibrium distribution coefficients and diffusion coefficients of elements and other used parameters are listed in Table 3. 24,31) With the progress of solidification, the solute elements are enriched in interdendritic liquid and precipitation of MnS occurs, when the product of the local concentrations of Mn and S reaches the equilibrium solubility product, K MnS , calculated by the following equation:…”

"In-situ" Observation of the .DELTA./.GAMMA. Phase Transformation on the Surface of Low Carbon Steel Containing Phosphorus at Various Cooling Rates

“…Ueshima's mathematical model 17,18) was used to calculate the redistribution of solutes during the d/g transformation process in this paper. The calculated domain is shown schematically in Fig.…”

Effect of Phosphorus on Sulfide Precipitation in Strip Casting Low Carbon Steel

“…The solute redistribution during the = transformation was calculated by Ueshima's model. 16) The parameters for calculation are listed in Table 3. Figure 8 shows the temperature evolution for low and high P steels during solidification.…”