Numerical Investigation of Filtration Influenced by Microscale CO Bubbles in Steel Melt

Asad, Amjad; Aneziris, Christos G.; Schwarze, Rüdiger

doi:10.1002/adem.201900591

Cited by 7 publications

(4 citation statements)

References 33 publications

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“…This suggests that for the inclusions to float to the steel–slag contact, there must be outside forces at play. Amjad Asad et al [ 48 ] developed a numerical model to consider the process of cobubble formation and showed that the formation of cobubbles on the surface of inclusions is the main reason for the improvement of melt cleanliness. In a physical simulation of the removal of inclusions in a bottom‐blown argon ladle, Zheng et al [ 49 ] discovered that at small blowing volumes and small bubble sizes, inclusions floated to the slag interface by adhering to the surface of numerous small diffusion bubbles; at large blowing volumes and large bubble sizes, inclusions were carried to the slag interface by the wake after the bubbles.…”

Section: Mathematical Model For Removing Inclusionsmentioning

confidence: 99%

Research Status of Numerical Simulation of Nonmetallic Inclusions Interfacial Removal

Sun

Yang

et al. 2023

steel research int.

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The removal of inclusions in liquid steel has always been the focus of research, and the removal of inclusions is mainly through the process of the inclusion through the slag–steel interface. The inclusion removal process can be subdivided into inclusions in molten steel grew up rise, in steel–slag interface through separation, adsorb dissolved in molten slag 3 steps. Based on the microscopic process of three steps, this article summarizes and discusses the mathematical model, fluid mechanics model, and experimental verification method of inclusion removal process, analyzes limiting and influencing factors of inclusion removal process, and comprehensively describes the numerical simulation research progress of inclusion removal process. With the development of numerical simulation techniques and experimental equipment, some progress has been made in the study of interfacial removal of inclusions. The inclusion interface removal behavior can be analyzed semiquantitatively based on dynamic force model. The computational fluid dynamics model has advantages in studying the phenomena of the inclusion interface, and the phase‐field method is often used to simulate the removal process of the inclusion interface. The combination of water model and numerical simulation, high‐temperature laser confocal method, and other methods is of great help to explore the interface behavior of inclusions.

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Section: Mathematical Model For Removing Inclusionsmentioning

confidence: 99%

Research Status of Numerical Simulation of Nonmetallic Inclusions Interfacial Removal

Sun

Yang

et al. 2023

steel research int.

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“…The current article will not deal with bubble formation on filter surface because it was found that this aspect has a negligible influence on melt cleanliness. [ 27 ]…”

Section: Numerical Modelmentioning

confidence: 99%

“…Here, the authors reported high cleaning efficiency of the steel melt. In another investigation by Asad et al, [ 27 ] the authors performed numerical simulation to study the impact of bubble formation at filter surface on melt cleanliness. The authors concluded that the CO bubble formation with subsequent inclusion attachment to the bubbles at filter surface has a negligible positive effect on melt cleanliness.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of the Combined Effect of Reactive Cleaning and Active Filtration on Inclusion Removal in an Induction Crucible Furnace

Asad

Schwarze

2021

steel research int.

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Herein, the combined influence of reactive cleaning and active filtration on inclusion removal is investigated using numerical simulations. Carbon‐bonded ceramic foam filters with active and reactive effect are inserted into the steel melt to remove nonmetallic inclusions. In case of reactive cleaning, carbon can dissolve from the filters into the melt. As a result, carbon reacts with oxygen on inclusion surface to form carbon monoxide bubbles. The filters can capture inclusions in terms of its active effect. A numerical model is developed in the open source library OpenFOAM to study the efficiency of the combined effect of filters. The results of the numerical simulations show that the flow field and the concentration of carbon are affected considerably by the position and the number of the used filters. Moreover, the results highlight the significant positive effect of reactive cleaning on the level of melt cleanliness despite the short time of the reactive phase of the filters. Moreover, it is apparent from the results that reactive cleaning dominates active filtration. The findings of the article prove the importance of reactive cleaning in the steel casting industry to enhance inclusion removal and improve steel quality.

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“…Therefore, the CO formation contributes to a "reactive" deoxidation of the molten steel, [9,[22][23][24] whereas the CO bubbles entrap and remove nonmetallic inclusions "actively." [25,26] The increase in the amount of dissolved Al in the reaction zone is regarded as the main reason for the formation of secondary corundum on the surface of the Al 2 O 3 ─C filter ceramics. However, the existing models cannot explain the nature of the continuous layer, which forms in the first reaction step directly on the surface of the functionalized filter, its role as a substrate for the growth of the secondary corundum and its contribution to the filtering of the nonmetallic inclusions.…”

Section: Introductionmentioning

confidence: 99%

Formation of Interface Layers between Corundum‐Based Refractory Ceramics with Carbon Additions and Molten 42CrMo4 Steel

2021

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The formation of reaction layers between corundum‐based (Al2O3 + C) filter materials covered with functional Al2O3C coatings having different carbon contents and molten steel 42CrMo4 is investigated at the reaction temperature of 1600 °C. Within the first 60 s, an amorphous reaction layer is formed at the interface between the original filter surface and the molten steel. This layer consists mainly of Fe and O with small, varying amounts of Al and Si. After a longer contact time (120 s), nanocrystalline phases, which are identified as iron‐based oxides, formed within this amorphous interlayer. After 5 min, the amorphous interface layer is replaced by a dense corundum layer, on which thin corundum platelets are attached. The formation of the amorphous interface layer, its transformation to dense corundum, and the effect of the carbon content in the functional Al2O3C coating on the nucleation and growth of the corundum platelets are discussed. The reaction experiments are carried out in a spark plasma sintering device to avoid liquid metal convection and as immersion tests in a steel casting simulator to obtain relevant information about the filtering process.

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Numerical Investigation of Filtration Influenced by Microscale CO Bubbles in Steel Melt

Cited by 7 publications

References 33 publications

Research Status of Numerical Simulation of Nonmetallic Inclusions Interfacial Removal

Research Status of Numerical Simulation of Nonmetallic Inclusions Interfacial Removal

Numerical Investigation of the Combined Effect of Reactive Cleaning and Active Filtration on Inclusion Removal in an Induction Crucible Furnace

Formation of Interface Layers between Corundum‐Based Refractory Ceramics with Carbon Additions and Molten 42CrMo4 Steel

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