A Finite Element Model for 2-Dimensional Slice of Cast Strand.

Han, Heung Nam; Lee, Jung-Eui; Yeo, Taejung; Won, Young Mok; Kim, Kyung-Hyun; Oh, Kyu Hwan; Yoon, Jong-Kyu

doi:10.2355/isijinternational.39.445

Cited by 57 publications

(45 citation statements)

References 1 publication

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“…In previous work, 10,31) the calculated results of deformed geometries of the strand, temperature of strand and mold, the thickness of solidifying shell and the wear phenomenon of narrow side mold had been showed in good agreement with the experimental observations at the typical casting conditions in industrial operation of 0.1 wt% C, slab width of 1 600 mm, casting speed of 1 m/min and narrow face taper of 1.5%/m. Figure 3 shows the calculated crack susceptibility distributions at various distances below meniscus at the typical casting conditions.…”

Section: Resultssupporting

confidence: 55%

“…The continuous casting process has been mathematically modeled to increase the understanding of the roles of important process variables on the defects. [2][3][4][5][6][7][8][9][10] Despite such intense studies, the thermo-mechanical behaviors of the stand and the mold during continuous casting are not fully understood due to the complex operating conditions of continuous casting process. In particular, a complexity arises in the formation of an air gap between the solidifying shell and the mold wall as a result of thermal and d/g transformation contractions.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Solidification Cracking Using the Specific Crack Susceptibility.

et al. 2000

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Using a 2-dimensional finite element, the effects of carbon content, slab width, narrow face taper and casting speed on solidification cracking during continuous casting of slabs were analyzed. The possibility of solidification cracking during continuous casting of slabs was predicted using the "Specific Crack Susceptibility", S S C . The new proposed parameter, S S C , can represent the averaged possibility of solidification cracking of the strand during continuous casting in the mold. The surface crack formed near corner region of strand at the initial stage of solidification, and the internal crack was found in the internal regions of wide center, corner and off-corner at the middle and final stage of solidification. The carbon range sensitive to solidication cracking is between 0.1 wt% C and 0.14 wt% C steels. At the slab widths of 1 900 mm and 2 150 mm, the possibility of solidification cracking increased in the regions of wide center, corner and offcorner in comparison with the slab width of 1 600 mm. With increasing narrow face taper, the possibility of solidification cracking decreased along the region of wide face due to the mechanical compression imposed by the narrow face taper. With increasing casting speed, the possibility of solidification cracking increased in the regions of wide center, corner and off-corner, because the shell thickness is largely decreased due to decrease of dwelling time of strand within the mold. These predictions at various casting conditions were in good agreement with the experimental observations in industry.KEY WORDS: specific crack susceptibility; solidification cracking; carbon content; slab width; narrow face taper; casting speed.dency during continuous casting of steels. They divided the mushy zone into the mass/liquid feeding zone (0.4Ͻf s Ͻ0.9) and the cracking zone (0.9Ͻf s Ͻ0.99). Cracks formed in the mass/liquid feeding zone are refilled with the surrounding liquid, whereas cracks formed in the cracking zone can not be refilled with the liquid, because the dendrite arms are close enough to resist feeding of the surrounding liquid. They proposed the critical solid fraction to resist feeding of 0.9. However, the crack susceptibility coefficient can be increased with increasing carbon content, because the mushy zone increases with increasing carbon content. Many researchers 3,5,15) estimated the possibility of cracking in comparison with the maximum principal stress and transverse stress along the wide and narrow face. And, some investigators 4,16) have used a strain based fracture criterion in the mushy zone, assuming that the material fractures if the total mechanical strain exceeds 0.2% 4) and 1.6%. 16) However, the comparison of the absolute stress and strain values is not enough to investigate the possibility of cracking during continuous casting, because the stress in the solidifying shell changes as a function of temperature and the mushy zone solidifies in almost stress free state, even though the strain occurs in the mushy zone. Kelly et al. 6) and Kim et ...

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Section: Resultssupporting

confidence: 55%

Section: Introductionmentioning

confidence: 99%

Analysis of Solidification Cracking Using the Specific Crack Susceptibility.

et al. 2000

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“…The surface temperature of the opposite region corresponding to the boundary cell was obtained by interpolation and the heat transfer coefficient between the solidified shell and the mold wall was calculated with a function of the surface temperature related to the mold flux used. 11,12) • Free Surface of the Melt…”

Section: Boundary Conditionsmentioning

confidence: 99%

Numerical Analysis of Fluid Flow and Heat Transfer in the Parallel Type Mold of a Thin Slab Caster.

2001

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The surface and internal defects in the continuously cast slab are closely related to the fluid flow conditions of the liquid steel in the continuous casting mold. Therefore, the control of the steel flow for example, by proper design of submerged entry nozzle and by optimum operating conditions, has become an important area for quality and productivity improvement. In this study, a three-dimensional numerical model for fluid flow and heat transfer analysis was employed and flow pattern and related phenomena in the parallel type thin slab mold were simulated together with a comparison with our previous study on the funnel type mold. The dependence of the flow on the shape of the SEN was illustrated for both straight and bifurcated nozzles. The bifurcated nozzle creates streamlines of two counter-rotating loops at each half of the mold similar to that of the funnel type mold with a bifurcated nozzle and produces a stabilized meniscus with a low surface velocity. The design of the nozzle port affects the velocity profile at the meniscus, heat transfer and accordingly the solidification process. An inclined bifurcated nozzle with a jet angle of 60°shows more stable velocity profile in the meniscus and more uniform distribution of solidified shell than the other port.

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“…[9][10][11] Some researchers applied the surface temperature of the strand in solidification cracking studies. 12) All of the measurement methods of the solidified shell thickness (breakout measurement, sensing method, radioactive tracer and chemical tracer) show that the Eq.…”

Section: Introductionmentioning

confidence: 99%

A New Semi-analytical Model for Prediction of the Strand Surface Temperature in the Continuous Casting of Steel in the Mold Region

2008

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In this research, a new semi-analytical model is presented for the strand surface temperature in the continuous casting of steel. Firstly with a dimensional analysis approach a general relation between the strand surface temperature and the other effective variables such as conductivity of the steel, pouring temperature, casting velocity, distance from the meniscus, volume rate of cooling water, solidus temperature and heat flux density at the meniscus is deduced. The constants appeared as coefficients or powers of variables in presented relation were computed by a numerical simulation of continuous casting for a breakout bloom. The resulted semi-analytical model for strand surface temperature was extended to predict the solidified shell thickness. The resulted semi-analytical model was validated with comparison to experimental, analytical and numerical results of slab, billet and bloom and good agreement was seen. The new presented model at this research is in versus of controllable parameters and specifications of the mold and it can be used for design of a process control system for continuous casting of slab, billet and bloom.

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A Finite Element Model for 2-Dimensional Slice of Cast Strand.

Cited by 57 publications

References 1 publication

Analysis of Solidification Cracking Using the Specific Crack Susceptibility.

Analysis of Solidification Cracking Using the Specific Crack Susceptibility.

Numerical Analysis of Fluid Flow and Heat Transfer in the Parallel Type Mold of a Thin Slab Caster.

A New Semi-analytical Model for Prediction of the Strand Surface Temperature in the Continuous Casting of Steel in the Mold Region

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