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首页> 外文期刊>ISIJ international >Internal Defects of Continuous Casting Slabs Caused by Asymmetric Unbalanced Steel Flow in Mold
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Internal Defects of Continuous Casting Slabs Caused by Asymmetric Unbalanced Steel Flow in Mold

机译：型钢不对称流动引起的连铸板坯内部缺陷

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摘要

The molten steel flow in the continuous casting mold and entrapment of inclusions and bubbles on the inner surface of the solidified shell are examined to clarify the origin of internal defects in steel products. Defects on steel sheets are caused by inclusions and bubbles entrapped on the solidified shell during casting. It was found that bubbles are able to penetrate deeply due to an unbalanced time-dependent flow. This phenomenon can be explained by the Large Eddy Simulation model, which is capable of simulating the time-dependent flow. The number of inclusions increases as the bubble diameter and the distance of the position of entrapment from the top free surface increase. This indicates that bubbles collect inclusions while traveling in the molten steel in the continuous caster. A simple mathematical model is presented to explain how the inclusions are collected by bubbles. The calculation result's also reveal that the static magnetic field generated by the FC Mold reduces time-dependent flow changes and thereby prevents internal defects caused by bubbles and inclusions.
机译：检查钢水在连铸结晶器中的流动以及夹杂物和气泡在凝固壳内表面的包裹，以弄清钢产品内部缺陷的起源。钢板上的缺陷是由于铸造过程中夹杂物和残留在凝固壳体上的气泡引起的。已经发现，由于不平衡的随时间变化的流动，气泡能够深入渗透。这种现象可以用大涡模拟模型来解释，该模型能够模拟随时间变化的流动。夹杂物的数量随着气泡直径的增加和截留位置到顶部自由表面的距离的增加而增加。这表明当气泡在连铸机中的钢水中移动时，气泡会收集夹杂物。提出了一个简单的数学模型来解释气泡如何收集夹杂物。计算结果还表明，FC模具产生的静磁场减少了随时间变化的流量变化，从而防止了由气泡和夹杂物引起的内部缺陷。

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