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Effect of exciting current of high frequency electromagnetic field on initial solidification of steel during electromagnetic continuous casting

机译：高频电磁场的励磁电流对电磁连铸过程中钢的初始凝固的影响

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摘要

A three-dimensional finite element model of the electromagnetic field and temperature field of electromagnetic continuous casting (EMCC) process was developed. The aim was to investigate the effects of induction heat of high frequency electromagnetic field on the early solidification process of molten steel in mould under various conditions of exciting current parameters. The results show that the induction heat has significant effects on the early solidification process, which appear as increasing the billet surface temperature, thinning the initial solidified shell and lowering the starting point of the initial solidification. The increases in exciting current frequency and density make the effects of induction heat on solidification process increase remarkably. Especially, with the exciting current frequency increase, the early solidification process and shell growth become non-uniform in billet circumferential direction. Furthermore, if the exciting current density exceeds a certain value, there occurs a high temperature region in the top of molten steel column, and then the initial solidification rate is greatly decreased. As a conclusion, the effects of induction heat on initial solidification process must be considered when the exciting current frequency and density are adjusted during the electromagnetic continuous casting process.
机译：建立了电磁连铸过程电磁场和温度场的三维有限元模型。目的是研究在各种励磁电流参数条件下，高频电磁场感应热对结晶器内钢水早期凝固过程的影响。结果表明，感应热对早期凝固过程有显着影响，表现为钢坯表面温度升高，初始凝固壳变薄，初始凝固起点降低。励磁电流频率和密度的增加使得感应热对凝固过程的影响显着增加。特别地，随着励磁电流频率的增加，早期的凝固过程和壳的生长在坯料周向上变得不均匀。此外，如果励磁电流密度超过某个值，则在钢水塔的顶部会出现高温区域，从而大大降低了初始凝固速率。结论是，在电磁连续铸造过程中调节励磁电流频率和密度时，必须考虑感应热对初始凝固过程的影响。

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