高铝质坩埚熔炼铸造高锰钢夹杂的研究

The Study on Inclusions in Casting High Manganese Steel Smelted with High Alumina Furnace Crucible

摘要: 本工作研究了用高铝质坩埚熔炼铸造高锰钢条件下，钢液与坩埚之间的界面反应，分析了钢中非金属夹杂物的形成、形貌特征与成分。研究发现，在长时间的熔炼条件下，高温钢液会和坩埚产生机械咬合和冶金结合，钢液与坩埚接触界面存在明显的反应渗透层，使结构变得疏松，造成坩埚表面局部剥落。脱落后的颗粒在钢液内扩散迁移，并进一步与钢中的其他杂质元素和夹杂物组合成复合夹杂。夹杂主要包括氧化物、硫化物和复合夹杂物，其中氧化物夹杂主要以Al₂O₃为主，硫化物夹杂以MnS为主，复合夹杂则由多种氧化物组成，形成以铝硅酸盐为基相的无定型颗粒状夹杂。

Abstract: In this work, the interfacial reaction between molten steel and crucible was studied under the condition of melting and casting high manganese steel with high aluminum crucible. The formation, morphology and composition of non-metallic inclusions in steel were analyzed. It is found that the high-temperature molten steel and the crucible will produce mechanical adhesion and metallurgical bonding under long-term melting conditions, and there is an obvious reaction permeation layer at the contact interface between the molten steel and the crucible, which makes the structure loose and causes the local spalling of the crucible surface. After falling off, the particles diffuse and migrate in the liquid steel, and further combine with other impurity elements and inclusions in the steel to form composite inclusions. The inclusions mainly include oxides, sulfides and complex inclusions, among which the oxide inclusions are mainly Al₂O₃, the sulfide inclusions are mainly MnS, and the complex inclusions are composed of various oxides, forming amorphous granular inclusions with aluminosilicate as the base phase.