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采用真空感应炉冶炼Al-Si-Mn-Ti复合脱氧的低硫微合金钢,通过热力学计算对钢液凝固过程中Mn S析出规律进行分析,运用带X射线能谱分析仪的场发射扫描电镜对夹杂物形貌、尺寸和成分以及Mn S在复合氧化物上的析出形态进行分析。结果表明:Mn S的析出主要受液相中Mn、S含量和液相温度控制。Mn-Si,Mn-Ti,Al-Mn-Ti,Al-Mn-Si复合氧化物都能作Mn S析出的核心,Mn S在硅锰氧化物表面呈镶嵌状析出,在钛锰氧化物表面呈包裹状析出,还可溶解在铝钛锰和铝硅锰氧化物的内部。诱发IGF形核的复合夹杂物尺寸为2~3μm。
The S-phase micro-alloyed Al-Si-Mn-Ti deoxidized composite steel was vacuum smelted. The MnS precipitation during solidification was analyzed by thermodynamic calculation. The field emission scanning electron microscopy The morphology, size and composition of inclusions and the precipitation morphology of Mn S on the composite oxide were analyzed. The results show that the precipitation of Mn S is mainly controlled by the content of Mn and S in the liquid phase and the liquidus temperature. The Mn-Si, Mn-Ti, Al-Mn-Ti and Al-Mn-Si composite oxides all can be the core of MnS precipitation. MnS precipitates on the surface of silico-manganese oxide, Precipitated precipitation, but also dissolved in the titanium aluminum manganese and aluminum silicate oxide inside. The size of the composite inclusions induced by IGF nucleation was 2 ~ 3μm.