To predict the behavior of an alumina inclusion in front of the solid–liquid interface during solidification, the interfacial tension between SPFH590 micro-alloyed steel and alumina was experimentally determined. The surface tension of the micro-alloyed steel was measured by the constrained drop method, and the contact angle between the micro-alloyed steel and alumina was investigated by the sessile drop method. Temperature was controlled within the range of 1823 K to 1873 K, and the sulfur concentration in the steel was set in the range of 11 to 94 ppm. With increasing temperature, the surface tensions of steel samples decreased. Further, with increasing temperature, the contact angles of the samples containing 11 to 72 ppm sulfur decreased whereas that of the sample containing 94 ppm sulfur increased. The experimental data were then used to calculate the interfacial tension between the micro-alloyed steel and alumina according to Young’s equation. With increasing temperature, the interfacial tensions of the samples containing 11 to 72 ppm sulfur decreased whereas that of the sample containing 94 ppm sulfur increased. The behavior of an alumina inclusion in front of the solid–liquid interface in the SPFH590 steel was predicted using the calculated interfacial tension values. It was estimated that an increase in the sulfur concentration from 5 to 10 ppm caused a transition of the inclusion from being in an entrapped state to being pushed away from solid–liquid interface.

中文翻译：

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SPFH590钢固液界面前氧化铝夹杂物行为的预测

为了预测凝固过程中固液界面前氧化铝夹杂物的行为，实验确定了 SPFH590 微合金钢和氧化铝之间的界面张力。微合金钢的表面张力采用约束滴法测定，微合金钢与氧化铝的接触角采用静滴法研究。温度控制在 1823 K 至 1873 K 范围内，钢中硫浓度设置在 11 至 94 ppm 范围内。随着温度的升高，钢样品的表面张力降低。此外，随着温度的升高，含有 11 至 72 ppm 硫的样品的接触角减小，而含有 94 ppm 硫的样品的接触角增加。然后使用实验数据根据杨氏方程计算微合金钢和氧化铝之间的界面张力。随着温度升高，含 11 至 72 ppm 硫的样品的界面张力降低，而含 94 ppm 硫的样品的界面张力增加。使用计算的界面张力值预测 SPFH590 钢中固液界面前氧化铝夹杂物的行为。据估计，硫浓度从 5 ppm 增加到 10 ppm 会导致夹杂物从夹带状态转变为被推离固液界面。含有 11 至 72 ppm 硫的样品的界面张力降低，而含有 94 ppm 硫的样品的界面张力增加。使用计算的界面张力值预测 SPFH590 钢中固液界面前氧化铝夹杂物的行为。据估计，硫浓度从 5 ppm 增加到 10 ppm 会导致夹杂物从夹带状态转变为被推离固液界面。含有 11 至 72 ppm 硫的样品的界面张力降低，而含有 94 ppm 硫的样品的界面张力增加。使用计算的界面张力值预测 SPFH590 钢中固液界面前氧化铝夹杂物的行为。据估计，硫浓度从 5 ppm 增加到 10 ppm 会导致夹杂物从夹带状态转变为被推离固液界面。