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采用高温电阻炉,通过改变不同冷却条件和不同硫含量,系统研究了Ti-Al复合脱氧夹杂对MnS夹杂物析出量和形貌的影响。试验结果表明:冷却速率对MnS的析出有着重要的影响。当钢液中硫的质量分数从0.001%增加到0.01%时,在炉冷条件下,MnS析出量随着钢液中硫含量的增加而增加。但是在水冷条件下,MnS的析出量不随钢液中硫含量的增加而变化。当钢液中w([S])>0.008%时,所有氧化物夹杂表面都会析出MnS夹杂;当0.002%≤w([S])<0.008%时,复合氧化物夹杂中MnO+SiO2含量越高,MnS越容易在氧化物上面析出。复合夹杂物中Ti3O5和Al2O3对MnS的析出没有明显影响。当w([S])<0.002%时,基本没有MnS夹杂析出。MnS在低熔点氧化物上呈镶嵌状析出,在高熔点上呈包裹状析出。
The effect of Ti-Al composite deoxidation on the precipitation and morphologies of MnS inclusions was studied systematically by changing the different cooling conditions and different sulfur contents by using high temperature resistance furnace. The experimental results show that the cooling rate has an important effect on the precipitation of MnS. When the mass fraction of sulfur in the molten steel increased from 0.001% to 0.01%, the amount of MnS precipitated increased with the increase of sulfur content in the molten steel under the condition of furnace cooling. However, under the condition of water cooling, the amount of MnS precipitated does not change with the increase of sulfur content in molten steel. When 0.008% of w ([S]) in the molten steel precipitates MnS inclusions on all oxide inclusions; when 0.002% ≤ w ([S]) <0.008%, the content of MnO + High, MnS more easily precipitated in the oxide. The composite inclusions Ti3O5 and Al2O3 have no obvious effect on the precipitation of MnS. When w ([S]) <0.002%, almost no MnS inclusions were precipitated. MnS was inlaid in the low melting point oxide precipitated in the form of parcel-like precipitation at high melting point.