Effect of -Carbon and Sulfur in Continuously Cast Strand on Longitudinal Surface Cracks.

Kim, Kyung-Hyun; Yeo, Taejung; Oh, Kyu Hwan; Lee, Dong Nyung

doi:10.2355/isijinternational.36.284

Cited by 92 publications

(68 citation statements)

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“…The process control for high quality steel products necessarily needs the better understandings on the high temperature deformation behavior of steels, because the internal and longitudinal surface cracks tend to occur in a brittle temperature range by thermal contraction and mechanical deformation. 1) The mechanical properties of steels in the temperature range of mushy zone can be characterized by the zero strength temperature (ZST) and zero ductility temperature (ZDT), 1) which have been investigated by the high temperature tensile tests subject to the in-situ melting and solidifying thermal history. [2][3][4][5] The ZDT has been reported to be lower than ZST by the experimental measurements.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Behavior of Carbon Steels in the Temperature Range of Mushy Zone.

Seol

Won

et al. 2000

ISIJ International

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Section: Introductionmentioning

confidence: 99%

Mechanical Behavior of Carbon Steels in the Temperature Range of Mushy Zone.

Seol

Won

et al. 2000

ISIJ International

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“…Many investigations 11,19,26) on the relationship between the crack index by the industrial observations and the carbon content have reported carbon content of maximum cracking as the carbon range between 0.08 wt% C and 0.25 wt% C. Thus, the cracking prediction from critical strain or critical fracture stress has to show possibility below 0.08 wt% C and above 0.25 wt% C steels. But, Won et al 19) pointed out that the cracking prediction based on critical stain or critical fracture stress can not explain the cracking phenomenon of whole carbon range, even though the calculated critical strain and critical fracture stress are in good agreement with the experimentally measured data.…”

Section: (4)mentioning

confidence: 99%

“…But, Won et al 19) pointed out that the cracking prediction based on critical stain or critical fracture stress can not explain the cracking phenomenon of whole carbon range, even though the calculated critical strain and critical fracture stress are in good agreement with the experimentally measured data. Recently, to predict the cracking tendency of whole carbon range, Kim et al 11) and Won et al 19) proposed a cracking criterion based on strain in the brittle temperature range and plastic deformation energy in the brittle temperature range, respectively. However, the effects of operating conditions of contiuous casting process, such as slab dimension, narrow face taper, casting speed and so on, on solidification cracking during continuous casting cannot be predicted by proposed models.…”

Section: (4)mentioning

confidence: 99%

“…Especially, internal cracks tend to occur in a brittle temperature range, DT B , due to the thermal contraction, mechanical deformation and d/g phase transformation. 11) The ductility loss of the mushy zone is associated with microsegregation of solute elements between solidifying dendrites. 12) A tensile deformation applied to the brittle temperature range causes the separation of dendrites.…”

Section: Introductionmentioning

confidence: 99%

“…Figure 5 shows the calculated specific crack susceptibility of whole strand, the strain in the brittle termperature range and experimentally measured corner crack index 29) as a function of carbon content. The strain in the brittle temperature range introduced by Kim et al.,11) have been computed as a function of carbon content using the microsegregation analysis. The crack index was measured at a commercial plant as a function of carbon content in continuously cast steel slabs.…”

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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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