提高硫化物纺锤化及弥散化的研究

Study on improving the spindling and dispersion of sulfide

钙处理及铝脱氧操作优化硫化物形态进行工业对比试验研究,利用扫描电镜对圆材中硫化物的等级、形态、成分类型统计分析。研究结果表明:钙处理及加入铝脱氧剂以后能够使钢中形成更多的mCaO·nAl_(2)O_(3)化合物,在钢液凝固的过程中成为MnS形核的核心,降低了MnS的形核能,促使了硫化物在氧化物颗粒表面析出和长大,也改变了硫化物在轧制锻造过程中的变形状态,即被拉断形态,使长条状MnS变性为纺锤状硫化物,同时分布更加的弥散化。工业生产中采用钙处理及铝脱氧操作来最终控制钢中硫化物的纺锤化和弥散化是可行的。

Calcium treatment and aluminum deoxidation operation were used to optimize sulfide morphology in industrial comparative experiments. The grades, morphology and composition types of sulfide in round steel were statistically analyzed by scanning electron microscope. The research results show that after calcium treatment and addition of aluminum deoxidizer, more mCaO·nAl_(2)O_(3) compounds can be formed in the steel, which become the core of MnS nucleation during the solidification of liquid steel, reduce the nucleation energy of MnS, promote the precipitation and growth of sulfide on the surface of oxide particles, and also change the deformation state of sulfide in the rolling and forging process,that is, change the pulled off shape, so that long MnS is modified into spindle sulfide, and the distribution is more diffuse.It is feasible to use calcium treatment and aluminum deoxidation in industrial production to finally control the spindling and dispersion of sulfide in steel.