The transformation of defects in continuous-cast semifinished products into surface defects on rolled products

Sychkov, A. B.; Zhigarev, M. A.; Perchatkin, A. V.; Mazanov, S. N.; Zenin, V. S.

doi:10.1007/s11015-006-0045-2

Cited by 19 publications

(6 citation statements)

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“…Hot deformation is necessary, as it transforms the cast dendritic structure into fine equiaxed grains, leading to a far more uniform distribution of alloying elements throughout the sheet material. Another purpose of hot reduction is to squash/weld any pores, if present, in the cast strip, so as to improve its mechanical properties [15].…”

Section: An Overview Of Previous Studies Conducted On Hsbc Metal Feeding Systemsmentioning

confidence: 99%

“…Depending on the metal head in the launder, the velocity of the molten metal issuing from the slot nozzle can be easily adjusted. However, the force of gravity is also equally responsible in further accelerating the molten metal before it contacts the moving belt, on which it solidifies [13][14][15]. The material produced via the HSBC process can then be processed downstream, by hot rolling, followed by cold rolling, as shown in Figure 1.…”

Section: An Introduction To Horizontal Single Belt Casting (Hsbc) Processmentioning

confidence: 99%

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Numerical Modeling of Transport Phenomena in the Horizontal Single Belt Casting (HSBC) Process for the Production of AA6111 Aluminum Alloy Strip

2020

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In this research study, numerical modelling and experimental casting of AA6111 strips, 250 mm wide, 6 mm thick, was conducted. The velocity of the molten AA6111 alloy at the nozzle slot outlet was raised to 2 m/s, whilst the belt speed was kept at 0.3 m/s. The numerical model demonstrates considerable turbulence/fluctuations in the flow of the molten AA6111 alloy in the HSBC process, rendering its free surface highly non-uniform and uneven. These discontinuites in the flow resulted from the sudden impact of molten metal onto the inclined refractory plane, and then onto the slowly moving belt. However, it has been determined that these surface variations are rapidly damped, and as such are not detrimental to final strip surface quality. Any surface perturbations remaining can be eliminated via hot plastic deformation. The experimental findings are in accordance with the model predictions. Furthermore, at high metal heads inside the delivery launder, the molten metal was observed to be flowing inwards towards the center of the strip, thereby filling the centre depression region, formed otherwise. The model predictions were validated against experimental findings. A surface roughness and microstructural analysis was also conducted to determine the surface and bulk quality of the as-cast strip.

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Section: An Overview Of Previous Studies Conducted On Hsbc Metal Feeding Systemsmentioning

confidence: 99%

Section: An Introduction To Horizontal Single Belt Casting (Hsbc) Processmentioning

confidence: 99%

Numerical Modeling of Transport Phenomena in the Horizontal Single Belt Casting (HSBC) Process for the Production of AA6111 Aluminum Alloy Strip

2020

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“…Analysis of technical literature [1][2][3][4][5][6][7][8][9][10] showed that, despite a large number of studies on the problem of quality of thin-sheet rolled products, the results are ambiguous and contradictory. There is no consensus on the source and causes of the formation of surface defects in rolled sheet metal.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of Formation of Internal and Surface Defects in Casting and Their Transformation Into Surface Defects of Sheet Sheet

Ibraev,

Ibraeva

2023

Preprint

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The results of a study of the processes of formation of macro- and micro-inhomogeneity of ingots and rolled sheets are presented. To study the nature and sources of surface defects in rolled sheets, a comparative method of structural-concentration analysis of metal at the end-to-end metallurgical process of ingot - slab - sheet metal has been developed, based on the metallographic method of studying the structure and qualitative analysis of non-metallic inclusions. The research results showed that the quality of the surface of rolled sheets is determined mainly by the physical heterogeneity of the crust zone of the ingots, and the internal defects of thin rolled sheets largely depend on the contamination of the metal with non-metallic inclusions and off-axis segregation. A mechanism for transforming defects in the casting cortical zone into surface and internal defects in rolled sheets is proposed.

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“…Improvement of production processes and enhancement of the quality of rolled metal products, especially those intended for critically important usage, are of uttermost importance for any metallurgical plant. Classification and determination of the nature of emerging surface defects are directly related to the technology of manufacturing of metal products at each metal conversion [1].…”

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confidence: 99%

Comprehensive Metallographic Studies of the Netted Cracks Surface Defect

Kovalyova¹,

Borisovets²,

Kargapolova³

et al. 2021

Steel Transl.

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The character of emerging surface defects is directly related to the technology of manufacturing metal products at each metal conversion. Star, netted, and transverse cracks are the defects that are the most significant and hardly removable in the continuous casting of steel in what considers the quality of surface. We applied optical and scanning electron microscopy to accurately determine the place of and reason for the emergence of netted cracks. The results obtained by metallographic examination of hot-rolled 140-mm round blank parts, continuously cast ingots, and "top crusts" of smaller and larger facets enabled us to determine that the sites were netted cracks emerging and excluding the adverse effects in casting metal that result in the occurrence of defects.

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The transformation of defects in continuous-cast semifinished products into surface defects on rolled products

Cited by 19 publications

References 0 publications

Numerical Modeling of Transport Phenomena in the Horizontal Single Belt Casting (HSBC) Process for the Production of AA6111 Aluminum Alloy Strip

Numerical Modeling of Transport Phenomena in the Horizontal Single Belt Casting (HSBC) Process for the Production of AA6111 Aluminum Alloy Strip

Mechanism of Formation of Internal and Surface Defects in Casting and Their Transformation Into Surface Defects of Sheet Sheet

Comprehensive Metallographic Studies of the Netted Cracks Surface Defect

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