Mathematical Model Analysis on the Formation Mechanism of Longitudinal, Surface Cracks in Continuously Cast Slabs

Matsumiya, Tooru; Saeki, Tsuyoshi; Tanaka, Jun; Ariyoshi, Toshihiko

doi:10.2355/tetsutohagane1955.68.13_1782

Cited by 60 publications

(21 citation statements)

References 3 publications

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“…As a result, deformation or cracking of the shell is induced there. [1][2][3][4][5] The thickness of solidified shell begins to be uneven at such early period that solidification time may be less than 1 s and the solidified shell may grow within only several millimeters. 6) On the evenness of solidified shell, such casting conditions as casting speed, [7][8][9] carbon content in molten steel and those of alloying elements 10,11) give large influences.…”

Section: Introductionmentioning

confidence: 99%

Growth of Solidified Shell Just below the Meniscus in Continuous Casting Mold

Hanao¹,

Kawamoto²,

Yamanaka³

2009

ISIJ Int.

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In the high speed continuous casting of hypo-peritectic steel slabs, growth of solidified shell just below the meniscus in the mold was researched. Rate of cooling and solidification was estimated on the basis of experimental results of thickness profiles of solidified shell, heat flux in the mold and dendrite arm spacing in the solidified structure beneath the surface of the slabs cast at 3-5 m/min.As a result, it was found that there is a delaying period of solidification growth at the beginning, till the shell grows up to about 1 mm thick. After that, it grows in linear relation to square root of solidification time. Dealing with the thickness profiles as a function of solidification time and solidification rate was obtained by differential. Furthermore, cooling rate of the shell was estimated with this solidification rate and heat flux in the mold. This cooling rate showed good agreement with that estimated from dendrite secondary arm spacing of the slabs.Estimated cooling rates were compared with the slabs by conventional continuous caster at 1.1-1.6 m/min and the influence of casting speed was discussed. It resulted in that cooling rate increases with casting speed and the difference by casting speed begins to be remarkable in the period of 0.1-1 s for solidification time, when uneven solidification just begins to occur. This agreement was considered to be one of the reasons why uneven solidification or longitudinal surface cracking of slabs tends to occur with increase of casting speed.

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Section: Introductionmentioning

confidence: 99%

Growth of Solidified Shell Just below the Meniscus in Continuous Casting Mold

Hanao¹,

Kawamoto²,

Yamanaka³

2009

ISIJ Int.

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show abstract

“…Due to the volume change in the transformation has been known to cause deformation of solidifying shell [1]. To avoid defect formation due to the transformation, many efforts have been done to understand the peritectic reaction / solidification [2].…”

Section: Introductionmentioning

confidence: 99%

Kinetics of the δ/γ interface in the massive-like transformation in Fe-0.3C-0.6Mn-0.3Si alloys

Nishimura

Morishita

Nagira

et al. 2015

IOP Conf. Ser.: Mater. Sci. Eng.

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“…For the mechanism of initial stage of solidification of carbon steel, many studies have been carried out to investigate experimentally and analytically, and it has become clear the generation mechanism of longitudinal surface crack and unevenness of solidified shell growth in what determined the surface quality of steel slabs. Especially, there are many studies [1][2][3][4][5] for the solidification mechanism of low and middle carbon steels, and it has become clear that the surface cracks of steel slabs was caused by peritectic reaction during solidification. It is shown that the surface defects of steel slabs can be reduced by optimizing the cooling conditions in the continuous casting mold from these studies.…”

Section: Introductionmentioning

confidence: 99%