In this study, a new method is proposed for the plasticization of inclusions by taking advantage of the behavior of alkali metals in lowering the inclusion melting point. A series of experiments with NaF additions to molten steel were carried out using a carbon tube furnace followed by simulated rolling tests using the solidified ingots and characterization of inclusions with the help of automated scanning electron microscopy. Compositional changes of the steel and evolution of gaseous species were evaluated using thermodynamic software FactSage 7.2 (ThermFact Inc., Montreal, QC, Canada). Based on this approach, NaF/steel/inclusion interactions and the effects of NaF addition on the melting point, size and deformability of inclusions were clarified. The modification of MnO-SiO2 inclusions by NaF also promoted the removal of inclusions and improved the cleanliness of steel. The results show that with the addition of NaF, the melting point of inclusions is greatly reduced, the deformability is improved, and the removal of inclusions is enhanced, all of which indicates a good prospect for industrial application.

中文翻译：

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添加NaF的钢丝夹杂物增塑新方法。

在这项研究中，提出了一种利用夹杂物的塑性降低碱夹杂物熔点的新方法。使用碳管炉进行了一系列向钢水中添加NaF的实验，然后使用凝固的铸锭进行了模拟轧制试验，并借助自动扫描电子显微镜对夹杂物进行了表征。使用热力学软件FactSage 7.2（ThermFact Inc.，蒙特利尔，QC，加拿大）评估了钢的成分变化和气态物种的演变。基于这种方法，阐明了NaF /钢/夹杂物的相互作用以及添加NaF对夹杂物的熔点，尺寸和可变形性的影响。NaF对MnO-SiO2夹杂物的改性也促进了夹杂物的去除并提高了钢的清洁度。结果表明，加入NaF可大大降低夹杂物的熔点，改善其变形能力，提高夹杂物的去除率，为工业化应用提供了良好的前景。