NDLI: Model Investigations on the Stability of the Steel-Slag Interface in Continuous-Casting Process

Content Provider	Springer Nature Link
Author	Hagemann, René Schwarze, Rüdiger Heller, Hans P. Scheller, Piotr R.
Copyright Year	2012
Abstract	In the continuous-casting mold, the mold powder in contact with the liquid steel surface forms a liquid slag layer. The flow along the steel-slag interface generates shear stress at the interface, waves, and leads to fingerlike protrusions of liquid slag into steel. Reaching a critical flow velocity and thereby shear stress, the protrusions can disintegrate into slag droplets following the flow in the liquid steel pool. These entrained droplets can form finally nonmetallic inclusions in steel material, cause defects in the final product, and therefore, should be avoided. In the current work, the stability of a liquid-liquid interface without mass transfer between phases was investigated in cold model study using a single-roller driven flow in oil-water systems with various oil properties. Applying the similarity theory, two dimensionless numbers were identified, viz. capillary number Ca and the ratio of kinematic viscosities ν $_{1}$/ν $_{2}$, which are suitable to describe the force balance for the problem treated. The critical values of the dimensionless capillary number Ca$^{}$ marking the start of lighter phase entrainment into the heavier fluid, are determined over a wide range of fluid properties. The dimensionless number ν $_{1}$/ν $_{2}$ was defined as the ratio of kinematic viscosities of the lighter phase ν $_{1}$ and heavier phase ν $_{2}$. The ratios of kinematic viscosities of different steel-slag systems were calculated using measured thermophysical properties. With the knowledge of thermophysical properties of steel-slag systems, Ca$^{}$ for slag entrainment as a function of v $_{1}$/v $_{2}$ is derived. Assuming no reaction between the phases and no interfacial flow, slag entrainment should not occur under the usual casting conditions.
Starting Page	80
Ending Page	90
Page Count	11
File Format	PDF
ISSN	10735615
Journal	Metallurgical and Materials Transactions B
Volume Number	44
Issue Number	1
e-ISSN	15431916
Language	English
Publisher	Springer US
Publisher Date	2012-11-08
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Metallic Materials Characterization and Evaluation of Materials Structural Materials Surfaces and Interfaces, Thin Films Nanotechnology
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Metals and Alloys Mechanics of Materials Condensed Matter Physics

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