Gao Xiaoyong,Ren Weiwang,Zhang Lifeng.Migration Law of Mg Element during Electroslag Remelting of Superalloys[J].Special Steel,2026,47(01):41-46. DOI: 10.20057/j.1003-8620.2025-00107.
Migration Law of Mg Element during Electroslag Remelting of Superalloys
Mg as the trace element is an important factor affecting the hot workability and high-temperature service performance of superalloys. The effect of MgO content in the slag for electroslag remelting on Mg content of a superalloy was investigated. Oxidation-reduction reaction took place at the interface between Al element in the molten superalloy and MgO in the molten slag at high temperatures, and dissolved Mg formed and then diffused into the molten alloy. The Mg content was evenly distributed in the case of low content of MgO in the slag. With the increasing of MgO content in the slag, the Mg content in the superalloy increased. However, the Mg content in different positions of the electroslag remelted ingot had a significant difference. Field emission scanning electron microscope equipped with energy dispersive spectrometer was used to characterize the inclusions and carbides. Thermodynamic analysis was conducted to explain the increasing of Mg content based on slag-metal reaction theory.
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