Macrosegregation in CC Slabs

Réger, Mihály; Verő, Balázs; Csepeli, Zsolt; Szélig, Árpád

doi:10.4028/www.scientific.net/msf.508.233

Cited by 7 publications

(2 citation statements)

References 1 publication

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“…The quality of continuously-cast slabs is influenced besides the chemical composition including purity [1,2], micro-and macrosegregation [3][4][5][6][7][8][9][10] according as precipitation of particles [11] mainly by: casting powder quality [2,12,13], casting rate [2,12,14], crystallizer cooling intensity [15], and secondary cooling rate [2,12,[15][16][17]. The casting rate and the secondary zone cooling rate are both parameters influencing the production costs, so they are of prime interest.…”

Section: Introductionmentioning

confidence: 99%

INFLUENCE OF COOLING RATE ON TiNb MICROALLOYED STEEL SLAB SURFACE ZONE FRACTURE MORPHOLOGY

Longauerová¹,

Bekeč²,

Vojtko³

et al. 2013

Acta Metall. Slovaca Conf.

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The aim of this work was to analyze the influence of technology on the morphology of fractures and Charpy impact toughness in the TiNb microalloyed steel slab surface zone. The slab was made by continuous casting using different cooling rates in the secondary cooling zone (2 cooling rates were selected for testing) and 2 slab pulling rates 0.5 m/min and 0.8 m/min. It turned out that, with a higher slab pulling rate for both cooling rates applied, the impact toughness was generally lower than that with the slow pulling rate. Microstructure analyses showed the composition of the surface zone was formed by ferrite and pearlite. Coarser ferrite was seen in the surface zone with the higher slab pulling rate and higher cooling rate in the secondary cooling zone. The surface zone microstructure was polyedric for the lower cooling rate and sporadically nonpolyedric with needle-like, or acicular ferrite for faster cooling. Brittle fracture test pieces showed fracture surfaces with transcrystalline cleavage facets (TCF) regardless of the applied cooling rate. With lower cooling rates, smooth facets of intercrystalline decohesion (FID) were identified too, but at less than 0.1%. With faster cooling they showed up in a few isolated cases only. The occurrence of dimpled transcrystalline ductile fractures (DTDF) was generally low. It was confirmed that the morphology of forced fractures was influenced by the cooling rate via the produced microstructure. The embrittlement of the tested samples was assisted by clusters and single particles. They were identified using EDX as based on Al, or combined with Ti, Nb nitrides, or carbide and sulphide eutectics, or inclusions ordered in rows in the ferrite network. Since the occurrence of intercrystalline fractures was low with faster cooling and high slab pulling rate, distinctive suppression of segregation can be assumed for this technology, if compared to slow cooling and low slab pulling rate.

show abstract

Section: Introductionmentioning

confidence: 99%

INFLUENCE OF COOLING RATE ON TiNb MICROALLOYED STEEL SLAB SURFACE ZONE FRACTURE MORPHOLOGY

Longauerová¹,

Bekeč²,

Vojtko³

et al. 2013

Acta Metall. Slovaca Conf.

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show abstract

“…The theory of porosity development outlined above is proven indirectly by an extended statistical analysis of a set of industrial data 16) . The analysis aimed to find a possible correlation between the complete technological database of slab castings and the centerline segregation index of cast products.…”

Section: Estimation Of the Zls Position Based On A Statistical Analysmentioning

confidence: 99%

Control of Centerline Segregation in Slab Casting

2014

APH

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Effect of Electromagnetic Stirring on the Solidification Behavior of High-Magnetic-Induction Grain-Oriented Silicon Steel Continuous Casting Slab

Wang

Bao

et al. 2020

JOM

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Macrosegregation in CC Slabs

Cited by 7 publications

References 1 publication

INFLUENCE OF COOLING RATE ON TiNb MICROALLOYED STEEL SLAB SURFACE ZONE FRACTURE MORPHOLOGY

INFLUENCE OF COOLING RATE ON TiNb MICROALLOYED STEEL SLAB SURFACE ZONE FRACTURE MORPHOLOGY

Control of Centerline Segregation in Slab Casting

Effect of Electromagnetic Stirring on the Solidification Behavior of High-Magnetic-Induction Grain-Oriented Silicon Steel Continuous Casting Slab

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