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利用扫描电镜及能谱仪对Fe-Si-B合金中非金属夹杂物组成进行了分析,并研究了氧化物及硫化物夹杂在熔炼过程中的演变规律及其形成条件。研究结果表明:Fe-Si-B合金中夹杂物主要有Al、Si的氧化物,以及少量Ti、Mn的硫化物。经热力学计算,在1623K下,熔炼初期主要为Al的氧化过程,当熔体中[Al]的质量分数降低至0.002 2%后才发生Si的氧化;Ti及Mn的硫化物在1623K下不能形成,需熔体分别冷却至1550和1310K下才可形成。
The composition of non-metallic inclusions in Fe-Si-B alloy was analyzed by scanning electron microscopy and energy dispersive spectroscopy, and the evolution and formation conditions of oxides and sulfide inclusions in smelting process were studied. The results show that inclusions in Fe-Si-B alloy are mainly Al, Si oxides, and a small amount of Ti, Mn sulfide. Thermodynamically, at 1623 K, the oxidation process of Al is mainly at the initial stage of smelting. When the mass fraction of [Al] in the melt is reduced to 0.002 2%, the oxidation of Si takes place. The sulphides of Ti and Mn can not be formed at 1623 K , The melt to be cooled to 1550 and 1310K were formed.