Experimental Studies of Interfacial Heat Transfer and Initial Solidification Pertinent to Strip Casting.

Strezov, L.; Herbertson, Joe

doi:10.2355/isijinternational.38.959

Cited by 113 publications

(85 citation statements)

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“…Figure 7 show that a highly transient regime took place during the first 50 ms. The two physical phenomena that have been attributed to this regime are contact of the liquid metal with the substrate and nucleation of crystals [38][39][40]. After 50 ms, the heat flux is considerably reduced and the variation is small.…”

Section: Resultsmentioning

confidence: 94%

“…After 50 ms, the heat flux is considerably reduced and the variation is small. This steadier behavior has been associated with the presence of an interfacial gap as the solidified skin contracts away from the substrate [40][41][42][43]. Consequently, an arbitrary cut-off was used in the analysis of the heat fluxes and those occurring before and after 50 ms were analyzed separately.…”

Section: Resultsmentioning

confidence: 99%

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Dynamic wetting and heat transfer at the initiation of aluminum solidification on copper substrates

et al. 2009

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Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%

Dynamic wetting and heat transfer at the initiation of aluminum solidification on copper substrates

et al. 2009

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“…The surface topography of the roll is the most important factor in formation of the strip quality insofar as it influences heat transfer at metal-roll interface, [6][7][8][9] the metallographic structure of the as-cast strip, 10,11) its surface roughness 12,13) and inhomogeneous cooling and surface crack formation on the strip surface. 14) The as-cast strip is a semi-product which requires some post treatment.…”

Section: Problem Descriptionmentioning

confidence: 99%

“…Solidification of the molten steel begins on the roll surface in the region which is very close to the meniscus of the melt bath. 11) The high velocity of the roll surface, the presence of impurities and oxidation on the melt/roll surface interface and roughness of the roll surface give rise to non-uniform wetting of the roll by the melt and formation of micro areas of non wetting and micro areas of direct contact between the melt and the roll surface. 12,[31][32][33] In the micro areas of direct contact the molten steel impinges on the roll surface causing the surface to melt and be washed away with the liquid steel as shown in Fig.…”

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confidence: 99%

“…10. The main wear of the roll surface occurs in a very short time (several milliseconds) 11,48,49) when the roll surface interacts with the steel melt in the early stages of solidification. Application of roll separation force increases the intensity of the roll wear which is mainly caused by roll skidding on the strip surface and the digging of the strip surface into the roll.…”

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Wear of Roll Surface in Twin-roll Casting of 4.5% Si Steel Strip.

Zapuskalov

Vereschagin

2000

ISIJ International

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The rolls are one of the most important components of the twin-roll casting process, determining not only strip quality, but due to their expense, add to the price of the as-cast strip. The potential for reducing operational cost and ensuring required strip quality may be achieved through a reduction in wear of the roll surface and hence reduced frequency of roll surface reconditioning and replacement. To achieve this, it is imperative to understand the mechanisms of roll surface wear which occur during casting operations.The present study was aimed at determining the influence of liquid metal, roll separation force and strip incline from the vertical casting direction on the wear of the roll surface in a twin-roll casting process.It was found that roll wear in the twin-roll casting process is accompanied by removal of material from the roll surface and redistribution of topography of the roll surface. Applying high roll separation forces lead to increase erosion of the roll surface and coarsening of the roll surface topography. Roll surface wear caused by deformation occurs by imprinting of the strip surface on the roll surface as well as grinding of the roll surface by the strip. Even with the application of high roll separation forces the highest contribution to wear of the roll surface is by the interaction of the melt with the roll surface in the very early stages of solidification.KEY WORDS: rapid solidification process; twin-roll process; strip casting; wear; surface roughness.surface. To achieve this, it is imperative to understand the mechanism of roll surface wear which occurs during casting operations. It is of particular interest to relate the influence of liquid metal attack, roll separation force and effect of strip incline to the roll surface wear.The term wear remains a subject of some debate, 22) so to avoid confusion in this discussion the term wear in this work is accepted as "damage to a solid surface, generally involving progressive loss of material, due to relative motion between that surface and a contacting substance or substances". 23) Experimental Equipment and Procedure Twin-roll Casting ProcessAn experimental investigation was carried out on a twin roll caster 24,25) schematically showed in Fig. 1. Steel melt was prepared from 50 kg ingots which were melted under an argon atmosphere in an induction furnace, yielding the following composition: 4.5% Si, 0.0013% Cu, CϽ0.007%, PϽ0.010%, NiϽ0.07%, TiϽ0.02%, CoϽ0.02% and AlϽ0.01%.The superheat was maintained at ϳ30°C and the melt entered the gap between the rolls through a slot in a ceramic nozzle. The cylindrical, water-cooled rolls constructed from Cu-Cr sleeves were ϳ440 mm in diameter and 150 mm in length. The casting speed was 7 m s Ϫ1 and the thickness of the as-cast strip 0.1-0.2 mm.The roll surface before casting was treated with an emery wheel. The roll surface obtained in this manner was further treated with fine emery paper to obtain a roughness of the roll surface, R a ϭ0.4 mm.The roll separation force per unit length of the ro...

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Commercial Production of Thin‐Strip by Twin‐Roll Strip Casting ‐ CASTRIP ^® Process

Mahapatra¹,

Blejde²,

Fukase³

et al. 2013

TMS2013 Supplemental Proceedings

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Experimental Studies of Interfacial Heat Transfer and Initial Solidification Pertinent to Strip Casting.

Cited by 113 publications

References 0 publications

Dynamic wetting and heat transfer at the initiation of aluminum solidification on copper substrates

Dynamic wetting and heat transfer at the initiation of aluminum solidification on copper substrates

Wear of Roll Surface in Twin-roll Casting of 4.5% Si Steel Strip.

Commercial Production of Thin‐Strip by Twin‐Roll Strip Casting ‐ CASTRIP ^® Process

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Experimental Studies of Interfacial Heat Transfer and Initial Solidification Pertinent to Strip Casting.

Cited by 113 publications

References 0 publications

Dynamic wetting and heat transfer at the initiation of aluminum solidification on copper substrates

Dynamic wetting and heat transfer at the initiation of aluminum solidification on copper substrates

Wear of Roll Surface in Twin-roll Casting of 4.5% Si Steel Strip.

Commercial Production of Thin‐Strip by Twin‐Roll Strip Casting ‐ CASTRIP ® Process

Contact Info

Product

Resources

About

Commercial Production of Thin‐Strip by Twin‐Roll Strip Casting ‐ CASTRIP ^® Process