Filtration Mechamism of Non-metallic Inclusions in Steel by Ceramic Loop Filter.

Uemura, Kunihiko; Takahashi, Masamitsu; Koyama, Satoshi; Nitta, Masaki

doi:10.2355/isijinternational.32.150

Cited by 90 publications

(56 citation statements)

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“…More specifically, it illustrates that the steel flow has a large stress force on the nozzle wall. As reported by Uemura et al, 60) an inclusion that comes close to a nozzle wall sinters and forms a neck with the refractory of a nozzle wall or with an inclusion that already deposited on a nozzle wall. According to Sambasivam,30) the neck will be broken and the inclusion may be washed away when a shear stress at the neck is higher than the sinter bond strength.…”

Section: Steel Flow Phenomenamentioning

confidence: 74%

Turbulent Flow Phenomena and Ce2O3 Behavior during a Steel Teeming Process

Jonsson

Ersson

et al. 2013

ISIJ Int.

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Steel flow phenomena and Ce2O3 inclusion behavior are presented in this paper. A three-dimensional model was developed to describe the steel flow phenomena and the inclusion behavior during a teeming process. The Kim-Chen modified k-ε turbulent model was used to simulate the turbulence properties and the Height-of-Liquid model was used to capture the interface between gas and steel. A Lagrangian method was then used to track the inclusions and to compare the behaviors of different-size inclusions in the steel flow. In addition, a statistical analysis was carried out by the use of a stochastic turbulence model to investigate the behaviors of different-size inclusions at different nozzle regions. The results show that the steel flow was the most turbulent at the connection region of the straight pipe part and the expanding part of the nozzle. All inclusions with a diameter smaller than 20 μ m were found to have a similar trajectory and velocity distribution in the nozzle. However, inertia force and buoyancy force were found to play an important role for the behaviors of large-size inclusions/clusters. The statistical analysis results indicate that the regions close to the connection region between different angled nozzle parts seem to be very sensitive with respect to deposition of inclusions.

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Section: Steel Flow Phenomenamentioning

confidence: 74%

Turbulent Flow Phenomena and Ce2O3 Behavior during a Steel Teeming Process

Jonsson

Ersson

et al. 2013

ISIJ Int.

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“…[2] Therefore, especially for safety relevant components, it is crucial to improve the cleanliness of the metal melts: high-purity can be achieved by using a filtration process after the ladle treatment. [3][4][5] In the case of steel, ceramic foam filters (CFFs), especially those based on zirconia and carbon-bonded alumina, have been successfully employed for years.…”

Section: Introductionmentioning

confidence: 99%

Impact of Nanoengineered Surfaces of Carbon‐Bonded Alumina Filters on Steel Cleanliness

et al. 2017

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Using a special steel casting simulator, carbon-bonded alumina filters are immersed in a steel melt, which contains artificially-generated endogenous alumina particles. Uncoated and MWCNTs-coated ceramic filters are dipped and rotated for 10 and 300 s in the melt at 1 650 C. Before and after the immersion test, the same samples are analyzed by means of computer tomography, in order to investigate the kinetic of inclusions deposition on the filter surface and possibly to measure the thickness of the in situ formed layers as a function of the immersion time. In addition, samples of the solidified steel are taken after the tests and analyzed by light and electron microscopy. The population of detected inclusions is classified in terms of size and chemistry in order to compare the filtration efficiency of the carbon-bonded filters.

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“…The mechanism of inclusions deposition on a filter surface takes place by following steps: transport of an inclusion from the melt to the filter surface, adhesion on the filter surface, and following by the solid phase sintering on the filter material. [5] Because of their excellent thermal shock and creep resistance, carbonbonded materials based on Al 2 O 3 and/or MgO are especially suitable for applying as the foam ceramic filters with a functionalized filter surface. The filter surface can be further functionalized by active coatings in order to increase the amount of deposited inclusions from the melt.…”

Section: Introductionmentioning

confidence: 99%

Interactions between Exogenous Magnesia Inclusions with Endogenous Inclusions in a High Alloyed Steel Melt

et al. 2017

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Interactions between exogenous MgO particles and endogenous inclusions on the surface of a high alloyed steel melt have been investigated in situ in a high temperature confocal laser scanning microscope. Exogenous magnesia particle forms immediately a liquid Mg-Si-Al-Ti-Cr phase surrounding the solid particle. The real attraction forces between the liquid layer surrounding MgO particles and endogenous Al 2 O 3 inclusions are determined in the range of 6 Â 10 À18 N to 1 Â 10 À16 N. In contrast to earlier investigations with exogenous Al 2 O 3 particles, lower real attraction forces between exogenous and endogenous particle pairs have been observed in comparison to endogenous inclusions pairs.

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Filtration Mechamism of Non-metallic Inclusions in Steel by Ceramic Loop Filter.

Abstract: As shown in Fig. 3

Cited by 90 publications

References 1 publication

Turbulent Flow Phenomena and Ce2O3 Behavior during a Steel Teeming Process

Turbulent Flow Phenomena and Ce2O3 Behavior during a Steel Teeming Process

Impact of Nanoengineered Surfaces of Carbon‐Bonded Alumina Filters on Steel Cleanliness

Interactions between Exogenous Magnesia Inclusions with Endogenous Inclusions in a High Alloyed Steel Melt

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