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首页> 外文期刊>ISIJ international >Morphology and Composition of Inclusions in Si–Mn Deoxidized Steel at the Solid-Liquid Equilibrium Temperature
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Morphology and Composition of Inclusions in Si–Mn Deoxidized Steel at the Solid-Liquid Equilibrium Temperature

机译：固液平衡温度下Si-Mn脱氧钢中夹杂物的形态和组成

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Morphology and composition of inclusions change with temperature. However, besides the temperature conditions during steelmaking or continuous casting, other factors contributing to changes in the morphology and composition of inclusions during solidification are still unknown. In this study, the formation of complex inclusions in Si–Mn deoxidized steel after isothermal holding at the solid-liquid equilibrium temperature (T_(S)) was investigated.The typical inclusions found in the alloy were MnO–SiO_(2) based, spherically shaped and homogeneously distributed. With isothermal holding at the solid-liquid equilibrium temperature, formation of a secondary SiO_(2)-rich inclusion phase occurred. The changes in the composition of the inclusions depended on the manganese and silicon contents in the metal.The general mechanism of inclusion formation observed in this study can be divided into three steps: 1) the formation of primary MnO–SiO_(2) inclusions above the liquidus temperature when the steel is in a completely molten state as a result of the deoxidation process; 2) the nucleation of secondary inclusions as the molten steel becomes supersaturated with the solute elements while holding at the solid-liquid equilibrium temperature; and 3) the growth and coalescence of inclusions due to natural convection in the molten alloy. From this, the inclusions formed in Si–Mn deoxidized alloys held isothermally at the solid-liquid equilibrium temperature were of three types: primary MnO–SiO_(2) inclusions, secondary SiO_(2) inclusions and complex inclusions with both primary MnO–SiO_(2) inclusions and precipitated secondary SiO_(2) inclusions.
机译：夹杂物的形态和组成随温度变化。但是，除了炼钢或连铸过程中的温度条件外，其他在凝固过程中导致夹杂物形态和成分变化的因素仍然未知。在这项研究中，研究了在固液平衡温度（T_（S））下等温保温后Si-Mn脱氧钢中复杂夹杂物的形成。在合金中发现的典型夹杂物为MnO-SiO_（2）基，球形和均匀分布。随着等温保持在固液平衡温度下，形成了富含SiO_（2）的次生夹杂相。夹杂物组成的变化取决于金属中锰和硅的含量。本研究中观察到的夹杂物形成的一般机理可分为三个步骤：1）形成上述主要MnO–SiO_（2）夹杂物由于脱氧过程，钢处于完全熔融状态时的液相线温度; 2）当钢水保持固液平衡温度时，钢中的溶质元素过饱和时，次生夹杂物的形核; 3）熔融合金中自然对流引起的夹杂物的生长和聚结。据此，在固液平衡温度下等温保持的Si-Mn脱氧合金中形成的夹杂物分为三种类型：MnO-SiO_（2）夹杂物，SiO_（2）二级夹杂物和MnO-SiO_两者均含复杂夹杂物（2）夹杂物和沉淀的次生SiO_（2）夹杂物。

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