凝固组织对连铸板坯中心偏析的影响

根据钢厂的生产实践,从凝固组织入手,从宏观角度阐释了凝固组织对中心偏析及钢液流动的影响.中心偏析是由于凝固界面均一向前推进,溶质元素在中心部位汇聚造成的;柱状晶发达,高溶质钢液停留在柱状晶间的间隙内,可以改善中心偏析;等轴晶凝固界面可以分散汇聚在中心部位的溶质元素,改善偏析;钢液补充凝固收缩的现象发生在等轴晶区内,恶化了中心偏析.

Research and application of a high-sensitive slag detection system

The effect of solidification structure on the centerline segregation and flow of molten steel has been studied based on the steel production and the solidification structure.The interface of solidification goes ahead regularly and the solutes concentrate on the center of slabs,which cause the segregation.But if the columnar crystals are developed and the solutes rest on the interspace of columnar crystals,the centerline segregation can be improved.The solidification interface of equiaxed grains can spread the solutes around it,which can improve the centerline segregation,but when the phenomena of molten steel complementing the solidification shrinkage happens in the region of equiaxed grains,it will worsen the centerline segregation.