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Control Technique Study of Non-metallic Inclusions in Low Carbon Steel by Rare Earth Final Deoxidization

机译：稀土最终脱氧控制低碳钢中非金属夹杂物的控制技术研究

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Thermodynamic calculations were carried out to analyze the formation mechanism of inclusion in low carbon steel by rare earth final deoxidization. The deoxidization and alloying process of steelmaking was stimulated in laboratory. The inclusions in as-cast samples were extracted with the method of non-aqueous solution electrolysis. Scanning electron microscope (SEM) with energy dispersive spectrometer (EDS) was used to analyze the chemical composition, three-dimensional morphology and size distribution of the inclusions. The calculation result showed that the Al-Mg-Ce-O complex inclusions could form when the content of rare earth increases to a proper value, and it has lower melting point than magnesium aluminate spinel, which is harmful to the property of steel. The experimental result showed that, the three-dimensional morphology of Al-Mg-Ce-O complex inclusions is spherical, and the mean diameter of that is about 5 μm. Furthermore, the formation mechanism and the control technique of complex inclusion were discussed.
机译：进行了热力学计算，分析了稀土最终脱氧作用在低碳钢中夹杂物的形成机理。在实验室中刺激了炼钢的脱氧和合金化过程。采用非水溶液电解法提取铸态样品中的夹杂物。采用能谱仪（EDS）的扫描电子显微镜（SEM）分析了夹杂物的化学成分，三维形态和尺寸分布。计算结果表明，当稀土含量增加到适当值时，可形成Al-Mg-Ce-O复合夹杂物，且熔点低于铝酸镁尖晶石，对钢的性能有害。实验结果表明，Al-Mg-Ce-O复合夹杂物的三维形态为球形，平均直径约为5μm。此外，还讨论了复杂夹杂物的形成机理和控制技术。

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