Analysis of the Rate of Crystallization and Precipitation of MnS in the Resulphurized Free-cutting Steel

Ueshima, Yoshiyuki; Isobe, Kohichi; Mizoguchi, Shozo; Maede, Hirobumi; Kajioka, Hiroyuki

doi:10.2355/tetsutohagane1955.74.3_465

Cited by 44 publications

(24 citation statements)

References 3 publications

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“…The formation of inclusions in stainless steel was calculated as a case study. Based on the microsegregation model [29], Ueshima et al [93,94] simulated the behavior of MnS formation during the solidification of resulfurized free-cutting steel. In the calculation, it was assumed that MnS started to crystallize in liquid or precipitate in solid when the corresponding concentration products of Mn and S exceeded the equilibrium solubility.…”

Section: Thermodynamic Modelsmentioning

confidence: 99%

“…Comparing the calculated results with the unidirectional solidification tests, the distribution of MnS and solutes Mn and S were well predicted, which suggested that the rate of both crystallization and precipitation were controlled by the diffusion of Mn (the dotted line in Figure 4). Based on the microsegregation model [29], Ueshima et al [93,94] simulated the behavior of MnS formation during the solidification of resulfurized free-cutting steel. In the calculation, it was assumed that MnS started to crystallize in liquid or precipitate in solid when the corresponding concentration products of Mn and S exceeded the equilibrium solubility.…”

Section: Thermodynamic Modelsmentioning

confidence: 99%

See 1 more Smart Citation

Modeling Inclusion Formation during Solidification of Steel: A Review

You

Michelic

Presoly

et al. 2017

Metals

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Abstract:The formation of nonmetallic inclusions in the solidification process can essentially influence the properties of steels. Computational simulation provides an effective and valuable method to study the process due to the difficulty of online investigation. This paper reviews the modeling work of inclusion formation during the solidification of steel. Microsegregation and inclusion formation thermodynamics and kinetics are first introduced, which are the fundamentals to simulate the phenomenon in the solidification process. Next, the thermodynamic and kinetic models coupled with microsegregation dedicated to inclusion formation are briefly described and summarized before the development and future expectations are discussed.

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Section: Thermodynamic Modelsmentioning

confidence: 99%

Section: Thermodynamic Modelsmentioning

confidence: 99%

Modeling Inclusion Formation during Solidification of Steel: A Review

You

Michelic

Presoly

et al. 2017

Metals

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“…Thus, it is important to consider the microsegregation of solutes when simulating MnS formation. Ueshima et al [10] thermodynamically evaluated MnS formation based on an analysis of the interdendritic segregation. Imagumbai [11] applied a Solidification-Unit-Cell method to calculate the mean diameter of MnS, which depends on the cell volume, temperature gradient, and solidification speed.…”

Section: Introductionmentioning

confidence: 99%

“…Different researchers [10][11][12][13] developed several models describing MnS formation. MnS is normally generated from the enrichment of Mn and S in the residual liquid during the solidification process.…”

Section: Introductionmentioning

confidence: 99%

Modeling of manganese sulfide formation during the solidification of steel

et al. 2016

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A comprehensive model was developed to simulate manganese sulfide formation during the solidification of steel. This model coupled the formation kinetics of manganese sulfide with a microsegregation model linked to thermodynamic databases. Classical nucleation theory and a diffusion-controlled growth model were applied to describe the formation process. Particle size distribution (PSD) and particle-size-grouping (PSG) methods were used to model the size evolution. An adjustable parameter was introduced to consider collisions and was calibrated using the experimental results. With the determined parameters, the influences of the sulfur content and cooling rate on manganese sulfide formation were well predicted and in line with the experimental results. Combining the calculated and experimental results, it was found that with a decreasing cooling rate, the size distribution shifted entirely to larger values and the total inclusion number clearly decreased; however, with increasing sulfur content, the inclusion size increased, while the total inclusion number remained relatively constant.

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“…Various efforts have been undertaken to control the morphology of the MnS inclusions. [7][8][9][10][11][12] In order to accomplish this task, precise characterization of the inclusions is necessary. Previous studies have used primarily simple optical or electron microscopes to observe the inclusions.…”

Section: Introductionmentioning

confidence: 99%

Quantitative Analysis of Inclusions in Low Carbon Free Cutting Steel Using Small-angle X-ray and Neutron Scattering

et al. 2012

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The microstructure of inclusions in low carbon free cutting steel without lead addition was investigated using small-angle X-ray scattering (SAXS) coupled with small-angle neutron scattering (SANS). The twodimensional (2D) SAXS pattern shows clear scattering due to inclusions composed of large elongated particles aligned along the rolling direction, and small isotropic particles. From a comparison of the simulated and experimental 2D SAXS patterns, the shapes of the inclusions are regarded as ellipsoid for the larger inclusions and spherical for the smaller inclusions. The length of the minor axis in the large inclusion is 6.9 μm, while the diameter of the small inclusion is 0.50 μm. The aspect ratio of the large inclusion is estimated to be 3.8 in the lower q region, and is reduced slightly to 3.5 in the higher q region from the azimuthal plots. The results of an alloy contrast variation (ACV) analysis using both the SAXS and SANS data indicate that the chemical composition of the inclusions is almost NaCl-type manganese sulfide, and that the amount of iron sulfide is low. The volume fractions are 1.4% for the large inclusions and 0.2% for the small inclusions. This is consistent with the area fraction estimated using an optical microscope, and indicates that nearly all of the sulfur in the steel sample forms the manganese sulfide inclusions.

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Analysis of the Rate of Crystallization and Precipitation of MnS in the Resulphurized Free-cutting Steel

Cited by 44 publications

References 3 publications

Modeling Inclusion Formation during Solidification of Steel: A Review

Modeling Inclusion Formation during Solidification of Steel: A Review

Modeling of manganese sulfide formation during the solidification of steel

Quantitative Analysis of Inclusions in Low Carbon Free Cutting Steel Using Small-angle X-ray and Neutron Scattering

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