高牌号无取向硅钢精炼过程夹杂物分析
Analysis of inclusions in high grade non-oriented silicon steel during refining
无取向硅钢的磁性能很大程度上受到钢材内部因素的影响,其中夹杂物的影响至关重要。为了研究无取向硅钢精炼过程中夹杂物的演化机制,选择某高牌号无取向电工钢进行全流程分析。通过蔡司场发射扫描电镜和能谱仪(SEM-EDS)对夹杂物进行形貌、成分和种类进行分析。结果表明:该牌号无取向硅钢在RH阶段添加脱氧剂合金后主要为团簇状和球状Al2O3 类夹杂物;在RH添加脱硫剂后,Al2O3 夹杂物被改性为CaO-Al2O3-MgO夹杂物、MgO-Al2O3 和MgO-Al2O3-CaS夹杂物;RH破空后几乎不再存在Al2O3 夹杂物,夹杂物中MgO-Al2O3 夹杂物的比例有所上升;中间包时夹杂物多为MgO-Al2O3-CaS和CaO-Al2O3-MgO复合型夹杂物,并且氮化物和硫化物的数量有所增加。
The magnetic properties of non-oriented silicon steel are largely affected by its internal factors,especially the influence of inclusions.In order to illustrate the evolution machanism of inclusions in the refining process,the high grade non-oriented electrical steel was selected for the whole process analysis.The mocroscopy,composition and species of the inclusions were analyzed by the Zeiss field emission sacnning electron microscopy and energy dispersive spectroscopy(SEM-EDS).The result shows that the cluster and spherical Al2O3 inclusions are the main inclusions after adding deoxidizer alloy.Afterwords,Al2O3 inclusions were modified into CaO-MgO-Al2O3 inclusions,MgO-Al2O3 inclusions and MgO-Al2O3-CaS inclusions in RH treatment.After RH breaking,there are no Al2O3 inclusions in steel.The proportion of MgO-Al2O3 in the composite inclusions tended to increase.The MgO-Al2O3-CaS and CaO-Al2O3-MgO composite inclusions are formed in the tundish,and the number of nitrides and sulfieds tended to increase.
王哲;任强;张立峰;
燕山大学机械工程学院,秦皇岛 066004;燕山大学机械工程学院,秦皇岛 066004;北方工业大学机械与材料工程学院,北京 100144;
non-oriented silicon steel the morphology of inclusions the whole process analysis
594-597 / 4
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