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Inclusions chemistry for Mn/Si deoxidized steels: Thermodynamic predictions and experimental confirmations

机译：Mn / Si脱氧钢的夹杂物化学：热力学预测和实验确认

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摘要

Inclusions chemistry of Mn/Si deoxidized steel was studied through both thermodynamic computation and experimental method. The computational thermodynamics has proved to provide a powerful tool for controlling inclusions and precipitates in steel. For Mn/Si deoxidized steels, important factors in determining the liquidus temperature and primary phase of the inclusions are MnO/SiO_2 ratio and Al_2O_3 content in inclusions. Provided that no further interaction with steel matrix during cooling, inclusions having MnO/SiO_2 mass percent ratio near unity and Al_2O_3 content in the range of 10-20mass percent give low liquidus temperatures (1150-1200 deg C) and primary phases of MnSiO_3 and Mn_3Al_2Si_3O_(12) both which are soft. For the case of Mn + Si = 1.0 in mass percent, the Mn/Si ratio of 2-5 meets the above conditions. Effect of the top slag on the inclusions chemistry can be predicted with accuracy, and hence it is possible to control the inclusions chemistry through proper design of the top slag composition so that the inclusions show a low liquidus temperature and soft primary phase. As the inclusions composition gradually changes with time toward the top slag composition, the length of refining time which determines the extent of reaction with the top slag is an important factor in determining the inclusions chemistry.
机译：通过热力学计算和实验方法研究了Mn / Si脱氧钢的夹杂物化学。实践证明，计算热力学为控制钢中的夹杂物和析出物提供了强大的工具。对于Mn / Si脱氧钢，确定液相线温度和夹杂物主相的重要因素是MnO / SiO_2比和夹杂物中Al_2O_3的含量。如果在冷却过程中不与钢基质进一步相互作用，则MnO / SiO_2质量比接近于1且Al_2O_3含量在10-20mass％范围内的夹杂物会产生较低的液相线温度（1150-1200℃）以及MnSiO_3和Mn_3Al_2Si_3O_的初生相（12）两者都很柔软。在Mn + Si ＝ 1.0质量％的情况下，Mn / Si比为2〜5满足上述条件。可以精确地预测顶渣对夹杂物化学的影响，因此可以通过适当设计顶渣成分来控制夹杂物的化学性质，从而使夹杂物显示出较低的液相线温度和软的初生相。随着夹杂物组成随时间逐渐变化为顶渣成分，决定与顶渣反应程度的精炼时间长度是决定夹杂物化学性质的重要因素。

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