Study on Mitigating Center Macro‐Segregation During Steel Continuous Casting Process

Long, Mujun; Chen, Dengfu

doi:10.1002/srin.201100085

Cited by 44 publications

(39 citation statements)

References 25 publications

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“…In order to determine the occurrence segment of the crack and take targeted measures, it is necessary to study the temperature history of the continuous casting slab. In this study, solidification and heat transfer models were applied to predict the variation of slab temperature during the continuous casting process; more details may be found elsewhere …”

Section: Numerical Simulation Of the Slab Temperature Field During Comentioning

confidence: 99%

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A Method to Control the Transverse Corner Cracks on a Continuous Casting Slab by Combining Microstructure Analysis with Numerical Simulation of the Slab Temperature Field

Yang

Zhang

Lai

et al. 2018

steel research int.

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In the current article, a method based on analysis of the microstructure combined with numerical simulation of the temperature field of a continuous casting slab is proposed to eliminate the transverse cracks occurred in slab corners. The microstructures near the cracks will be varied as the phase‐transformation conditions change. Thus, the cracking temperature range can be effectively estimated by analyzing the microstructures near the cracks. The different behaviors of microstructures near cracks in three conditions are presented and discussed. These behaviors include the following: the decarburization layer is symmetrically distributed on both sides of the cracks; the microstructures are refined near the cracks; the cracks “open” the ferrite along the austenite grain boundaries, which results in the ferrite being symmetrically distributed on both sides of the cracks. The variation of the slab corner temperature during a continuous casting process is calculated and discussed. Then, a secondary cooling adjustment scheme is proposed to eliminate the occurrence of transverse corner cracks on the slab surface. Results from industrial practice show that the method can effectively avoid the generation of slab surface cracks without damage to the internal quality of the slab. The method can also be applied to other studies of crack control.

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Section: Numerical Simulation Of the Slab Temperature Field During Comentioning

confidence: 99%

“…In this study, solidification and heat transfer models were applied to predict the variation of slab temperature during the continuous casting process; more details may be found elsewhere. [4,25]…”

Section: Model Introductionmentioning

confidence: 99%

A Method to Control the Transverse Corner Cracks on a Continuous Casting Slab by Combining Microstructure Analysis with Numerical Simulation of the Slab Temperature Field

Yang

Zhang

Lai

et al. 2018

steel research int.

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“…The equilibrium partition coefficient varies from 0 to 1 for most solutes in steel [2,5], thereby indicating that a solute may be rejected from the solid phase to the liquid phase, which enriches the liquid phase during solidification. The solutes may concentrate in the residual liquid pool due to convection, which results in center segregation at the end of the solidification process of casting steel blank [6][7][8][9]. When the partition coefficient is low, segregation is serious.…”

Section: Introductionmentioning

confidence: 99%

Phase Transition of Peritectic Steel Q345 and Its Effect on the Equilibrium Partition Coefficients of Solutes

Chen

Long

Cao

et al. 2017

Metals

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Abstract:The solidification path of peritectic steel Q345 was calculated and compared with in-situ observations to investigate the effect of phase transition on the equilibrium partition coefficient. Subsequently, a thermodynamic model for calculating the equilibrium partition coefficient was established and thermodynamic calculations were performed under different phase configurations. Results indicate that L (liquid phase) + δ, L + δ + γ, and L + δ phases coexist in sequence during the solidification of peritectic steel Q345. The phase constitution of the mushy zone evidently affects the evolution of the equilibrium partition coefficient of solutes. The temperature dependence of the equilibrium partition coefficient was quantified through the regression analyses of C, Si, Mn, P, and S solutes under different phase configurations. The average equilibrium partition coefficients of Mn, Si, P, C, and S are 0.696, 0.615, 0.273, 0.2, and 0.033, respectively, thereby indicating the strongest segregation tendency for S and the weakest for Mn.

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“…[8,9] Semi-macrosegregations usually develop in the spaces of equiaxed crystals. The formation of centerline segregations is known for blooms and billets [2,[10][11][12][13][14] but for thick slabs general investigations of V-segregations are not conducted. Figure 1 shows the general understanding for the formation of V-shaped segregation for small formats [10,15] because of the two-dimensional heat removal.…”

Section: Introductionmentioning

confidence: 99%

A Three Dimensional Model to Characterize the Centerline Segregation in CC Slabs

Brune

Kortzak

Senk

et al. 2014

steel research int.

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In this investigation the formation of centerline segregation and shrinkage holes in the final stages of solidification during the continuous casting process of slabs is described. Therefore experimental and theoretical investigations of the melt behavior during the solidification are carried out. Based on these results, a model is presented to explain the formation of V-shaped segregation and core porosities caused by the restricted flow of melt through the mushy zone in slabs. The theoretical explanation is manifested by various observation, calculations and analyses by electron microprobe mappings. The main results are that V-segregation forms in quasi periodical frequency in longitudinal direction within continuous cast slabs. The areas of formation seem to be independent, like little billets lying side by side in one slab. Consequential a three dimensional model about the behavior of the liquid melt in the final stages of solidification is designed.

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Study on Mitigating Center Macro‐Segregation During Steel Continuous Casting Process

Cited by 44 publications

References 25 publications

A Method to Control the Transverse Corner Cracks on a Continuous Casting Slab by Combining Microstructure Analysis with Numerical Simulation of the Slab Temperature Field

A Method to Control the Transverse Corner Cracks on a Continuous Casting Slab by Combining Microstructure Analysis with Numerical Simulation of the Slab Temperature Field

Phase Transition of Peritectic Steel Q345 and Its Effect on the Equilibrium Partition Coefficients of Solutes

A Three Dimensional Model to Characterize the Centerline Segregation in CC Slabs

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