Abstract
Removal of non-metallic inclusions to CaF2-based slag is one of the most important functions of electroslag remelting. In this work, the dissolution behavior for alumina-based inclusions in CaF2-Al2O3-CaO-MgO-SiO2 slag has been investigated. Results indicate that the diffusion or permeability capacity of slag components into alumina particles is F−, Ca2+, Si4+, Mg2+, from strongest to weakest, for CaF2-Al2O3-CaO-MgO-SiO2 slag. Alumina inclusions react with F− in liquid slag at first and then react with CaO to form xCaO-yAl2O3 system. Subsequently, MgO substitutes for CaO to form a MgO-Al2O3 system layer surrounding the other product and reactant, and then enters the liquid slag. CaF2 can improve the dissolution capacity of slag to alumina inclusions. A complex region was formed between alumina-based particles and the slag, with different areas dominated by CaF2, CaO-Al2O3, CaO-SiO2 and MgO-Al2O3. The dissolution process of alumina particles in slag is different from the formation of compound inclusions originated from the Al-O deoxidization reaction.
Highlights
Electroslag remelting has been widely used for the manufacture of high quality steel and alloys.This process creates a sound product with a homogeneous compositions and a low concentration of very small inclusions [1]
The dissolution process of alumina particles in slag is different from the formation of compound inclusions originated from the Al-O deoxidization reaction
Yu et al [12] investigated the behavior of alumina in Na2 O-CaO-Al2 O3 -SiO2 -CaF2, it has a low fluoride inclusions in the fluoride-containing slag used in the electroslag remelting process
Summary
Electroslag remelting has been widely used for the manufacture of high quality steel and alloys. Yang et al [15] measured alumina [18], Liu and Verhaeghe et al [19], and Orrling and Sridhar et al [20] employed laser scanning solubility in a range of KF-AlF3 –based low-temperature electrolyte systems. Na2O-CaO-Al2O3-SiO2-CaF2, it has a low fluoride content in the slag and the situation is different for study the dissolution of inclusions in most fluoride-containing slags. Yu et al [12] investigated the behavior of alumina in Na2 O-CaO-Al2 O3 -SiO2 -CaF2 , it has a low fluoride inclusions in the fluoride-containing slag used in the electroslag remelting process. Found in the literature for the dissolution of alumina inclusions in the fluoride-containing slag used in dissolution is the first process, which is the important premise of removal and modification. In this paper, the absorption and dissolution mechanisms of alumina inclusions in fluoride-containing slag have been investigated
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