The effects of supersaturation and steel composition on the morphology of Al2O3 inclusions were investigated. Thermodynamic calculations with Factsage 7.0® were used to predict the degree of supersaturation and select the starting aluminum and oxygen amounts for the experiment. Deoxidation experiments were performed by melting the charge material and using specially designed samplers to study the local deoxidation reactions. The inclusions in the collected steel samples were analyzed on filter paper in 3D after extraction from the steel. The observed Al2O3 morphologies consisted of dendrites and clusters and results showed that increasing supersaturation had the strongest influence on the length of the dendrite. The observed clusters resulted from collision, heterogeneous nucleation and growth on existing Al2O3 inclusions, and possibly oxygen gradients and liquid steel convection during nucleation and growth of Al2O3.

中文翻译：

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预先存在的夹杂物对 Al2O3 尺寸和形貌的影响：不同过饱和度的单阶段脱氧

研究了过饱和度和钢成分对 Al2O3 夹杂物形貌的影响。使用 Factsage 7.0® 进行热力学计算来预测过饱和度并选择实验的起始铝和氧量。脱氧实验是通过熔化炉料并使用专门设计的采样器来研究局部脱氧反应来进行的。从钢中提取后，在滤纸上以 3D 方式分析收集的钢样品中的夹杂物。观察到的 Al2O3 形态由枝晶和簇组成，结果表明增加过饱和度对枝晶长度的影响最大。观察到的团簇是由现有的 Al2O3 夹杂物的碰撞、异质成核和生长产生的，