rôle des phénomènes superficiels dans le mécanisme d’élimination des inclusions solides

Kozakevitch, P.; Olette, M.

doi:10.1051/metal/197168100635

Cited by 24 publications

(13 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To optimize the steelmaking processes, knowledge of physical growth of the inclusions resulting from agglomeration is essential. In line with this direction, several studies [1][2][3][4][5][6][7][8] have been carried out to study and model the agglomeration of inclusions. However, understanding of the physical growth of inclusions in liquid steel is still limited.…”

Section: Introductionmentioning

confidence: 99%

Observation on Physical Growth of Nonmetallic Inclusion in Liquid Steel During Ladle Treatment

Kang

Sahebkar

Scheller

et al. 2011

Metall Mater Trans B

View full text Add to dashboard Cite

The behaviors of several types of inclusions at a high temperature were examined using a confocal scanning laser microscope (CSLM, 1LM21H/SVF17SP). Although alumina inclusions tended to impact on each other, agglomerate, and grow quickly, no other inclusion type, such as spinel as well as solid and liquid calcium aluminate, was observed to attract each other. The results of confocal microscope study were compared with the industrial investigation. For this purpose, many steel samples were taken at different stages of ladle treatment. The samples were analyzed by scanning and light optical microscopes. Approximately 50,000 inclusions of several types were examined. Only alumina inclusions were attracted to each other and agglomerate. No agglomeration by attractive behavior was observed in the other types of inclusions, including liquid inclusions. Both the industrial data and the in situ observation by CSLM indicate that, although the attraction force and the agglomeration play a significant role in the growth of alumina inclusions, the agglomeration of spinel and calcium aluminate inclusions does not need special consideration in ladle treatment. The agglomeration of liquid calcium aluminate inclusions took place only when they occasionally met as a result of external force, which led to low collision probability. However, the agglomeration of the liquid calcium aluminate inclusions along with alumina particles could be detrimental in the casting process.

show abstract

Section: Introductionmentioning

confidence: 99%

Observation on Physical Growth of Nonmetallic Inclusion in Liquid Steel During Ladle Treatment

Kang

Sahebkar

Scheller

et al. 2011

Metall Mater Trans B

View full text Add to dashboard Cite

show abstract

“…The thermodynamics of inclusion removal has been described in a number of papers. [3][4][5][6][7] For an inclusion to be removed it is necessary for it to travel through the slag/metal interface and on into the slag phase. In terms of interfacial energies, a favorable separation will be achieved, from a thermodynamic viewpoint, when the sum of changes in the various terms related to interfacial energies is favorable.…”

Section: Introductionmentioning

confidence: 99%

The Ability of Slags to Absorb Solid Oxide Inclusions

2006

View full text Add to dashboard Cite

The capture rate of solid oxide-inclusion particles from molten steel by molten slag depends on the rate of steel film drainage (which occurs at certain particle velocities), interfacial separation, and dissolution into the slag. In this study the capture of common oxide inclusions of sizes 2.5-200 mm and with velocities ranging from their terminal velocities to 0.3 m · s Ϫ1 approaching the interface between molten iron and slags with chemistries corresponding to ladle, tundish and mold slags are investigated. Calculations, based on a model available in literature, show that film drainage (when applicable) is rapid enough to be ignored. A sensitivity analysis based on the slag properties show that the interfacial energy between slag and inclusion is the most pertinent property that could hinder interfacial separation. However, the interfacial tension needed to achieve this has to be a minimum of 0.41 N/m which is unreasonable for the case of common oxide inclusions such as Al 2 O 3 , MgO, ZrO 2 and MgAl 2 O 4 . The final step of dissolution was found based on studies with Confocal Scanning Laser Microscope experiments, to be significantly slower than the other steps. For a 100 mm particle, in the slags/inclusions investigated a correlation between slag viscosity, h

show abstract

“…Figure 10(b) shows that the rupture energy increases slowly with increasing contact angle to 120°, thereafter it increases sharply with contact angle. This can explain why the clustering of Al 2 O 3 is more severe compared with SiO 2 (115°), 55) ZrO 2 (122°) 52) and MgO (125°).…”

Section: Influence Of Surface Tension Contact Angle Andmentioning

confidence: 84%

Effect of Alumina Morphology on the Clustering of Alumina Inclusions in Molten Iron

et al. 2016

View full text Add to dashboard Cite

Clustering of alumina inclusions during liquid processing of steel significantly influences its cleanliness and mechanical properties. We have therefore studied the effect of alumina inclusion morphology on their clustering behavior in molten iron. Alumina inclusions were extracted from iron samples taken at 1 min after Al addition. Dendritic, spherical, plate-like, faceted and clustered alumina inclusions were identified and their clustering degrees were measured. The clustering degree increases in the order of spherical, dendritic, plate-like and faceted inclusions. To explain this, attractive force between two alumina particles with different shape combinations, i.e., sphere-sphere (S-S), sphere-plane (S-P), plane-plane (P-P), was calculated based on the theory of spontaneous cavitation. The attractive force is influenced significantly by particle shape. S-S type has the smallest attractive force and the shortest acting length. P-P type has the largest attractive force and the longest acting length. This explains that spherical inclusions have the lowest clustering degree. The lower clustering degree of plate-like inclusions, compared with faceted inclusions, is due to that molten iron wets plate-like inclusions better.

show abstract

rôle des phénomènes superficiels dans le mécanisme d’élimination des inclusions solides

Cited by 24 publications

References 0 publications

Observation on Physical Growth of Nonmetallic Inclusion in Liquid Steel During Ladle Treatment

Observation on Physical Growth of Nonmetallic Inclusion in Liquid Steel During Ladle Treatment

The Ability of Slags to Absorb Solid Oxide Inclusions

Effect of Alumina Morphology on the Clustering of Alumina Inclusions in Molten Iron

Contact Info

Product

Resources

About