On the Formation of Macrosegregation and Interdendritic Cracks During Dendritic Solidification of Continuous Casting of Steel

El-Bealy, Mostafa Omar

doi:10.1007/s11663-013-9911-z

Cited by 24 publications

(14 citation statements)

References 53 publications

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“…The position of cracking top, bottom, and CET boundaries was recorded from 50 START slabs, as shown in Figure . The internal cracks mainly formed in the upper slab side, similar to the results reported by El‐Bealy . Occurrence of cracks in C part was more often than other parts, and no cracks were detected in D part.…”

Section: Start Processsupporting

confidence: 86%

Investigation on Improvement of Center Porosity with Heavy Reduction in Continuously Cast Thick Slabs

Wang

Jiang

2016

steel research int.

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The heavy reduction process of START (Solidification Terminal Advanced Reduction Technique) is developed mainly to improve the center porosity of slabs. According to the simulation results of heat transfer model, the distribution of solid fraction along the slab width can be equally divided into four parts, and the part in 1/4-1/8 width is the last solidifying region with the most serious porosity. START is implemented within two segments accounting for the uneven solidification. The heavy reduction is carried out in the first segment, which the optimum solid fraction ranges from 0.53 to 0.98 and the optimum reduction amount is 9 mm. The second segment is conducted with a 3 mm reduction amount to further improve the porosity of the slab from 1/4 to 1/8 width. Both the center porosity and segregation can be improved significantly by the START process, as well as the evenness of porosity and segregation along the slab width. In addition, the in-strand Electro-Magnetic Stirring (SEMS) is introduced to improve the internal cracks of slabs, and the results show that the cracks are greatly improved without deterioration of center porosity.

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Section: Start Processsupporting

confidence: 86%

Investigation on Improvement of Center Porosity with Heavy Reduction in Continuously Cast Thick Slabs

Wang

Jiang

2016

steel research int.

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“…The dendrite growths of the columnar crystals usually excess solute segregation at the interface of the primary dendrite arms [2], resulting in non-uniform distribution of mechanical properties. The grain boundaries of the columnar dendrites are susceptible to stress and strain concentration, causing separation of the intergranular cracks [3]. Three main causes of the off-corner subsurface cracks are: thermal gradients, concentration gradients, and mechanical forces.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the off-corner subsurface cracks of continuous casting blooms under the influence of soft reduction and controllable approaches by a chamfer technology

Zong

Zhang

Liu

et al. 2019

Metall. Res. Technol.

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In the current study, the morphology of the off-corner subsurface cracks located on the cross section of continuous casting bloom under a soft reduction operation was observed. A 3D thermo-mechanical model was adopted to calculate the temperature history, bulging deformation and stress distributions in the reduction region, and then to analyze the formation of the off-corner subsurface cracks under the influence of soft reduction. The results showed that the off-corner subsurface cracks can be formed under the influence of the extensive stress fields which develop in the cracking temperature range, especially located on the loosed side of the bloom corner region. Adjusting the chamfer angle and chamfer length can decrease stress concentration and bulging deformation to minimize the risk of off-corner subsurface cracks during the soft reduction operation.

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“…It was also analyzed that the steel components are associated with the regularity of cracks formation . Harada et al found out that the micro‐segregation in meniscus is the origin of transverse surface cracks, and El‐Bealy discussed the influence of macro‐segregation distribution on the inter‐dendritic crack formation. Furthermore, the unreasonable heat transfer conditions in the mold also increased the solidifying shell defects .…”

Section: Introductionmentioning

confidence: 99%

“…The initial solidifying shell in meniscus has a high cracking susceptibility due to the low strength and ductility. Cracks formation is effected by many factors as illustrated, such as contractive volume or inhomogeneous composition . However, it is just because the existence of acting force induced the fracture behavior.…”

Section: Introductionmentioning

confidence: 99%

Formation of Initial Defects at Meniscus in Oscillating Mold

Zuo

Lin

Wang

et al. 2015

steel research int.

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The initially formed defects in the mold of continuous casting are likely to be expanded and propagated in the subsequent processing. Based on the principle of material mechanics, a mathematic model is proposed to describe the development of the solidifying shell at meniscus for continuous casting steel slab of low-carbon ([C] ¼ 0.04%) that with the crosssection of 1200 mm Â 200 mm. The influence of mechanical stress induced by the mold oscillation on the growth state of meniscus shell and the primary dendrites is evaluated in combination with a non-sinusoidal oscillation mode of mold. The results suggest that the stress caused by the shell bending tends to exceed the critical fracture strength of initial solidifying shell at high temperature. The initial surface crack is formed easily when the upward oscillation velocity of mold exceeds 1.6 m min À1 and is located at 1.9-5.6 mm below meniscus. The subsurface crack is formed when the downward velocity oversteps 6 m min À1 during the negative strip time and is produced in the distance from 3.1 to 4.3 mm below meniscus. The growth direction of primary dendrite changed regularly along with the mold oscillation.

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On the Formation of Macrosegregation and Interdendritic Cracks During Dendritic Solidification of Continuous Casting of Steel

Cited by 24 publications

References 53 publications

Investigation on Improvement of Center Porosity with Heavy Reduction in Continuously Cast Thick Slabs

Investigation on Improvement of Center Porosity with Heavy Reduction in Continuously Cast Thick Slabs

Analysis of the off-corner subsurface cracks of continuous casting blooms under the influence of soft reduction and controllable approaches by a chamfer technology

Formation of Initial Defects at Meniscus in Oscillating Mold

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