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在高温钼丝炉内向铁液中分别加入NiMg和SiMg合金进行脱氧,分析过程中溶解氧、全氧、残镁量及夹杂物随时间的变化,并与铝脱氧进行对比。结果表明:加入0.05%的SiMg合金处理后,铁液中溶解氧含量(质量分数)为1.5×10-6,全氧含量为1.9×10-5;经SiMg与NiMg合金处理的试样中夹杂物变化基本相同;加入镁合金并保温15min后凝固试样中夹杂物尺寸明显减小,约为2μm,其成分由Mn-Si-Al复合氧化物转变为Mg-Al尖晶石类夹杂物;加入Al并保温15min后,凝固试样中夹杂物尺寸较大,约为5μm,成分为纯Al2O3夹杂物;SiMg合金处理的试样中单位面积上夹杂物数量最少,钢中夹杂物最为细小、分散。
In the high temperature molybdenum wire furnace, NiMg and SiMg alloy were added into the molten iron to deoxidize respectively. The change of dissolved oxygen, total oxygen, residual magnesium and inclusions over time were analyzed and compared with that of aluminum deoxidation. The results showed that the content of dissolved oxygen (mass fraction) in the molten iron was 1.5 × 10-6 and the total oxygen content was 1.9 × 10-5 after the addition of 0.05% SiMg alloy. The inclusion of SiMg and NiMg alloy in the sample The change of the material is basically the same; the size of the inclusions in the solidified sample is obviously reduced to about 2 μm after the magnesium alloy is added into the magnesium alloy for 15 min, and the composition changes from Mn-Si-Al composite oxide to Mg-Al spinel inclusions; After adding Al and holding for 15 min, the size of the inclusions in the solidified sample is larger, about 5 μm, and the composition is pure Al2O3 inclusions. The amount of inclusions per unit area in SiMg alloy samples is the least, the inclusions in steel are the smallest, dispersion.