Experimental and theoretical studies have been carried out to investigate the effects of slag composition on the MgO·Al 2 O 3 inclusion in ingot during the electroslag remelting (ESR) process with a focus on developing a mass-transfer model to understand the evolution mechanism of MgO·Al 2 O 3 inclusion. H13 die steel was used as the electrode and remelted with two different kinds of slags by using a 30-kg ESR furnace. The inclusion compositions and contents of magnesium, silicon, and aluminum along the axial direction of product ingots were analyzed. On the basis of the unreacted core model as well as the penetration and film theories, the theoretical model developed in this work well elucidates the kinetics of slag–metal-inclusion reactions revealing the mechanism of inclusion evolution during the ESR process. The calculation results obtained from the model agree well with the experimental results. The model indicates that the inclusions of the outer MnS layer, which surrounds the MgO·Al 2 O 3 core in the electrode, are disintegrated and removed during the metal film formation process at the tip of the electrode in the ESR furnace. The more CaO there is in the slag, the higher the aluminum and magnesium in the ingot and the lower the silicon. The concentration of MgO in the MgO·Al 2 O 3 inclusion increases with the increase of CaO/SiO 2 in the slag. The aluminum in the electrode has little effect on the MgO·Al 2 O 3 inclusion compositions in the final product ingots.

中文翻译：

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模具钢电渣重熔过程中渣-金属夹杂物多相反应的研究

已经进行了实验和理论研究，以研究电渣重熔 (ESR) 过程中炉渣成分对铸锭中 MgO·Al 2 O 3 夹杂物的影响，重点是开发传质模型以了解电渣重熔过程中的演变机制。 MgO·Al 2 O 3 夹杂物。H13 模具钢用作电极，并使用 30-kg ESR 炉与两种不同的炉渣重熔。分析了沿产品铸锭轴向的镁、硅、铝夹杂物组成和含量。在未反应的岩心模型以及渗透和薄膜理论的基础上，这项工作建立的理论模型很好地阐明了炉渣-金属-夹杂物反应的动力学，揭示了 ESR 过程中夹杂物的演化机制。模型计算结果与实验结果吻合较好。该模型表明，在 ESR 炉中电极尖端的金属成膜过程中，围绕电极中 MgO·Al 2 O 3 核的外层 MnS 夹杂物被分解和去除。炉渣中的 CaO 越多，铸锭中的铝和镁含量越高，而硅含量越低。MgO·Al 2 O 3 夹杂物中MgO的浓度随着渣中CaO/SiO 2 的增加而增加。电极中的铝对最终产品锭中的MgO·Al 2 O 3 夹杂物组成影响不大。在 ESR 炉中电极尖端的金属膜形成过程中被分解和去除。炉渣中的 CaO 越多，铸锭中的铝和镁含量越高，而硅含量越低。MgO·Al 2 O 3 夹杂物中MgO的浓度随着渣中CaO/SiO 2 的增加而增加。电极中的铝对最终产品锭中的MgO·Al 2 O 3 夹杂物组成影响不大。在 ESR 炉中电极尖端的金属膜形成过程中被分解和去除。炉渣中的 CaO 越多，铸锭中的铝和镁含量越高，而硅含量越低。MgO·Al 2 O 3 夹杂物中MgO的浓度随着渣中CaO/SiO 2 的增加而增加。电极中的铝对最终产品锭中的MgO·Al 2 O 3 夹杂物组成影响不大。