"In-situ" Observation of Collision, Agglomeration and Cluster Formation of Alumina Inclusion Particles on Steel Melts.

Yin, Hang; Shibata, Hiroyuki; Emi, Toshihiko; Suzuki, Mikio

doi:10.2355/isijinternational.37.936

Cited by 238 publications

(186 citation statements)

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“…To investigate this topic, a number of models [76][77][78][79][80] have been developed based on the force balance on the inclusion at the advancing liquid/solid interface. Meanwhile, Confocal Scanning Laser Microscopy (CSLM) has also been applied for in situ observation of the behavior of particles [47,[81][82][83][84]. Most models define a critical solidification velocity above which inclusions are engulfed.…”

Section: Behavior Of Inclusions At the Solidification Interfacementioning

confidence: 99%

Modeling Inclusion Formation during Solidification of Steel: A Review

You

Michelic

Presoly

et al. 2017

Metals

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Abstract:The formation of nonmetallic inclusions in the solidification process can essentially influence the properties of steels. Computational simulation provides an effective and valuable method to study the process due to the difficulty of online investigation. This paper reviews the modeling work of inclusion formation during the solidification of steel. Microsegregation and inclusion formation thermodynamics and kinetics are first introduced, which are the fundamentals to simulate the phenomenon in the solidification process. Next, the thermodynamic and kinetic models coupled with microsegregation dedicated to inclusion formation are briefly described and summarized before the development and future expectations are discussed.

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Section: Behavior Of Inclusions At the Solidification Interfacementioning

confidence: 99%

Modeling Inclusion Formation during Solidification of Steel: A Review

You

Michelic

Presoly

et al. 2017

Metals

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“…In addition, studies by confocal laser scanning microscopy (CLSM) support that alumina particles within a steel melt have been strongly attracted by alumina. [9][10][11] Negative side effects of these attracting forces during steelmaking are known as clogging. Especially carbonbonded alumina submerged entry nozzles have been reported to clog due to deposited non-metallic inclusions, which arise from a decreased flow rate of the steel melt.…”

Section: Introductionmentioning

confidence: 99%

Functionalized Carbon‐Bonded Filters with an Open Porous Alumina Coating: Impact of Time on Interactions and Steel Cleanliness

et al. 2017

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Understanding interactions between filter and molten steel is essential to improve the purity of casted products by filtration. Characteristic, in situ formed layers on the surface of carbon-bonded alumina filters result from these interactions. To comprehend their formation, this study illustrates the time dependency of the layer buildup. Therefore, reactions at the filter/steel interface under quasi static conditions are examined using spark plasma sintering (SPS) equipment. Immersion tests in a steel casting simulator, which provides close-to-reality conditions, complement these investigations. Microstructure and phase analyses reveal that interfacial reactions between filter and steel lead to a thin in situ formed layer on the filter surface. During a "reactive" stage, large polycrystalline alumina structures are formed. Thereby, material is transported both from the carbon-bonded material underneath (i.e., gaseous reaction products) and from the molten steel (i.e., precipitating particles and endogenous inclusions) to the filter/steel interface. The formation of these alumina particles comes to an end as soon as the carbon supply, which triggers the dissolution and precipitation processes at the interface, is cut-off. From that point on, endogenous inclusions are deposited on them ("active" stage). The filters were most efficient during the reactive stage, that is, as long as the interfacial reactions take place.

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“…Professor Toshihiko Emi pioneered the use of laser confocal optics with an Au-image furnace allowing for in situ imaging, and his group at Tohoku University was the first to document the clustering of inclusions, [36,37] peritectic solidification, [38] and particle pushing. [39] The present work, inspired by Prof. Emi's stellar publications, leads on from the initial findings of Assis et al, [1] where high-temperature confocal scanning laser microscopy (HT-CSLM) and micro X-ray computer tomography (XCT) were coupled together to provide insight into the full transient morphology of an Fe-P 0.2 wt pct alloy droplet submerged in slag similar to that seen in end blow BOF refining.…”

Section: Introductionmentioning

confidence: 99%

Investigation into the Cause of Spontaneous Emulsification of a Free Steel Droplet; Validation of the Chemical Exchange Pathway

Spooner

Assis

Warnett

et al. 2016

Metall Mater Trans B

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Small Fe-based droplets have been heated to a molten phase suspended within a slag medium to replicate a partial environment within the basic oxygen furnace (BOF). The confocal scanning laser microscope (CSLM) has been used as a heating platform to interrogate the effect of impurities and their transfer across the metal/slag interface, on the emulsification of the droplet into the slag medium. The samples were then examined through X-ray computer tomography (XCT) giving the mapping of emulsion dispersion in 3D space, calculating the changing of interfacial area between the two materials, and changes of material volume due to material transfer between metal and slag. Null experiments to rule out thermal gradients being the cause of emulsification have been conducted as well as replication of the previously reported study by Assis et al. [1] which has given insights into the mechanism of emulsification. Finally chemical analysis was conducted to discover the transfer of oxygen to be the cause of emulsification, leading to a new study of a system with undergoing oxygen equilibration.

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"In-situ" Observation of Collision, Agglomeration and Cluster Formation of Alumina Inclusion Particles on Steel Melts.

Cited by 238 publications

References 0 publications

Modeling Inclusion Formation during Solidification of Steel: A Review

Modeling Inclusion Formation during Solidification of Steel: A Review

Functionalized Carbon‐Bonded Filters with an Open Porous Alumina Coating: Impact of Time on Interactions and Steel Cleanliness

Investigation into the Cause of Spontaneous Emulsification of a Free Steel Droplet; Validation of the Chemical Exchange Pathway

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