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Metallurgical and Materials Transactions B
Erschienen in: Metallurgical and Materials Transactions B 6/2012

01.12.2012

On the Formation of Interdendritic Internal Cracks During Dendritic Solidification of Continuously Cast Steel Slabs

verfasst von: Mostafa Omar El-Bealy

Erschienen in: Metallurgical and Materials Transactions B | Ausgabe 6/2012

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Abstract

In this study of solidification during the continuous casting of steel slabs, the effect of the different spray cooling conditions on the interdendritic internal cracks formed between the columnar dendrites has been examined by a metallographic study of the slab samples and by performing a set of mathematical analyses. The metallographic study involved plant trials to measure the slab surface temperature within different secondary spray cooling conditions. Also, macro/microexaminations of the collected samples from plant trials, measurements of dendrite arm spacing, and interdendritic distance between the columnar dendrites, as well as a segment length of interdendritic crack, have been performed. The experimental results show that the morphology of the interdendritic cracks described by the segment width and length fluctuate with the distance from the slab surface based on the secondary spray cooling conditions. A one-dimensional mathematical model of the heat transfer, solidification, structure evolution, interdendritic strain, and elementary interdendritic area (EIA) has been developed. This model takes into account also calculating the width of interdendritic crack. The model predictions are in a good agreement with the measurements. The results pointed out also that this criterion can be considered as the most important tool to measure the inner quality of the continuously cast steel slabs. Therefore, it helps also to define the required mechanism and reduction level of hot working deformation to close these interdendritic internal cracks. The formation mechanism of these cracks during the dendritic solidification of continuously cast steel slabs has been discussed and the available solutions have been proposed.
Vorheriger Artikel Investigation of the Oxidation Kinetics of Fe-Cr and Fe-Cr-C Melts under Controlled Oxygen Partial Pressures
Nächster Artikel Time-Series Analysis Technologies Applied to the Study of Carbon Element Distribution Along Casting Direction in Continuous-Casting Billet

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Fußnoten
1
υ = 0.0183 m/s, L mold = 0.7 m, ρ = 7500 kg/m3, C p = 700 J/kgK, λ = 28 W/mK.
 
2
υ = 0.0183 m/s, L mold = slab width = 1.68 m, ρ = 7500 kg/m3, C p  = 700 J/kgK, λ = 28 W/mK.
 
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Metadaten
Titel
On the Formation of Interdendritic Internal Cracks During Dendritic Solidification of Continuously Cast Steel Slabs
verfasst von
Mostafa Omar El-Bealy
Publikationsdatum
01.12.2012
Verlag
Springer US
Erschienen in
Metallurgical and Materials Transactions B / Ausgabe 6/2012
Print ISSN: 1073-5615
Elektronische ISSN: 1543-1916
DOI
https://doi.org/10.1007/s11663-012-9650-6

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