エレクトロスラグ再溶解における溶解および凝固プロセスの解析

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High carbon chromium steels were remelted in electroslag remelting process with various conditions to study the refining reactions of process, dendrite structures and distribution of nonmetallic inclusions.Empirical relationships are derived by regression analysis to correlate the major parameters in the ESR process. Furthermore, solidification process of ingot was analyzed by mathematical model. Results obtained are as follows:1) Desulfurization occurs more easily with high (%CaO)/(%Al2O3+%SiO2) ratio in the slag.2) Relationship between the inclination of primary dendrite arms θd and that of metal pool θp is expressed in (θp-25°)≤θd_≤θp. Therefore, it is expected that growing direction of primary dendrite arm does not change continuously with direction of heat flow.3) Size of oxide inclusions in the ESR ingot is under 10μm. Mean size and area ratio of them increase with deeper metal pool.4) Sulfide inclusion desolves into the matrix of tip of electrode during ESR process and sulfur transfers into the liquid metal film by diffusion mechanism.5) Melting rate, specific energy consumption and metal pool depth are expressed in the function of major parameters of the ESR process.6) Stationary metal pool profile predicted by mathematical model is obtained at which ingot height reaches over three times ingot radius. Pool depth mainly varies with melting rate. Slag temperatures are assumed to be 1600-1700°C by the comparison of pool depth predicted and measured.
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エレクトロスラグ再溶解における溶解および凝固プロセスの解析

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