The effect of three heat processes with different calcium contents on the evolution of inclusions during the ladle furnace refining process of AISI 321 stainless steel was investigated. The size, morphology, and composition of the inclusions were analyzed by scanning electron microscopy and energy-dispersive X-ray spectroscopy. After the addition of aluminum and titanium, the primary oxide in the AISI 321 stainless steel was an Al₂O₃-MgO-TiO_x complex oxide, in which the mass ratio of Al₂O₃/MgO was highly consistent with spinel (MgO·Al₂O₃). After calcium treatment, the calcium content in the oxide increased significantly. Thermodynamic calculations show that when the Ti content was 0.2wt%, the Al and Ca contents were less than 0.10wt% and 0.0005wt%, respectively, which was beneficial for the formation of liquid inclusions in molten steel. Moreover, the modification mechanism of calcium on TiN-wrapped oxides in combination with temperature changes was discussed.

研究了三种不同钙含量的热处理过程对AISI 321不锈钢钢包精炼过程中夹杂物演变的影响。通过扫描电子显微镜和能量色散X射线光谱分析了夹杂物的尺寸，形态和组成。加入铝和钛后，AISI 321不锈钢中的主要氧化物是Al ₂ O ₃ -MgO-TiO _x复合氧化物，其中Al ₂ O ₃ / MgO的质量比与尖晶石（MgO ·铝₂ O ₃）。钙处理后，氧化物中的钙含量显着增加。热力学计算表明，当Ti含量为0.2wt％时，Al和Ca含量分别小于0.10wt％和0.0005wt％，这有利于钢水中液态夹杂物的形成。此外，还讨论了钙在TiN包裹的氧化物上的改性机理以及温度变化。