钙处理对含硫非调质钢中夹杂物演变行为的影响

Effect of calcium treatment on change behavior of inclusions in sulfur-containing non-quenched and tempered steel

进行了钙处理变性含硫非调质钢中夹杂物的工业试验,通过SEM+EDS定性研究钢中夹杂物类型随工序的变化,得到钙处理对夹杂物演变的影响。针对硫化物夹杂的形态控制,用牛津INCA能谱仪Feature工具的自动扫描夹杂物功能定量分析钙处理前后钢中硫化物夹杂的类型、数量和尺寸的变化。研究结果表明,钙处理能够增加钢中复合硫化物数量,尤其是含钙复合硫化物,从而有利于降低轧材中长条状硫化物的比例,形成较多的球状或纺锤状硫化物,改善钢材的各向异性。进一步分析钙处理改性硫化物的作用机理,在不影响钢材机械性能前提下,钙处理适当降低钢液洁净度有利于含硫非调质钢中硫化物的形态控制,工业生产中采用钙处理的方法来进行硫化物的形态控制是可行的。

The industrial test of inclusions modification by calcium treatment in sulfur- containing non quenched and tempered steel was carried out. The effect of calcium treat- ment on inclusions evolution was obtained by the qualitative study in which inclusions changing with the development of process was analyzed by using SEM and EDS. In order to control sulfides morphology, the type, quantity and size of sulfides before and after calcium treatment were quantitatively analyzed by INCA Feature with automatically scanning inclusions function. It is found that calcium treatment can increase the quantity of compound sulfides, especially the calcium-containing compound sulfides, and then in favor of reducing the proportion of long strip sulfides by forming more globular or spin- dle sulfides, finally improve the anisotropy of steel. The mechanism of sulfides modifi- cation by calcium treatment was further analyzed, it is concluded that under the premise tl^at does not affect mechanical properties of steel, calcium treatment is advantageous to the control of sulfides morphology in sulfur-containing non quenched and tempered steel through properly lowering molten steel cleanliness. It is feasible to use calcium treatment for sulfides morphology control in industrial production.