钢中非金属夹杂物形态对其去除行为的影响

Effect of the morphologies of non-metallic inclusions on their removal behavior

采用物理模拟手段研究球形、立方体、圆柱体、树枝状、团簇状等钢中常见形状夹杂物形状修正系数的差异性,并分析粒子表面形貌和运动取向对形状修正系数的影响.粒子的形状修正系数与阻力系数满足线性正相关,可以用形状修正系数评价粒子的上浮去除能力;在体积相同情况下,同类型夹杂物粒子的去除能力依次为树枝状(垂直)<粗糙球形<立方体<圆柱(半经6 mm)<圆柱(半经4 mm)<树枝状(水平)<团簇状(水平)<光滑球形;粗糙表面的球形其表面积约为光滑球形的2倍,其形状修正系数同时增加2.1倍.简单粒子的形状修正系数受运动取向影响较小,复杂粒子则受运动取向影响较大,树枝状颗粒垂直上浮时的形状修正系数约为水平上浮时的2倍.

The differences in shape correction coefficient（ SCC） of common inclusions in molten steel including spherical,cubic,cylindrical,dendritic and cluster particles were studied by a physical simulation method. The effects of inclusion surface morphologies and movement orientation on the SCC were analyzed on the basis of simulation results. The SCC can be used to evaluate the inclusion removal ability because of a linear correlation relationship between the SCC and the resistance coefficient of inclusions. For inclusions with the same volume but different shapes,the removal ability increase in order as follows： dendritic particles with vertical floatation,spherical particles with coarse surfaces,cubic particles,cylindrical particles of 6 mm in radium,cylindrical particles of 4 mm in radium,dendritic particles with horizontal floatation,clusters,and spherical particles with smooth surfaces. When the surface area of spherical particles with coarse surfaces is approximately 2 times as large as that of spherical particles with smooth surfaces,the SCC of spherical particles with coarse surfaces increases by 2. 1 times compared with the smooth ones. For simple particles,movement orientation has just limited effect on the SCC,but it influences the SCC of complex particles greatly. The SCC of dendritic particles with vertical floatation is about twice of that with horizontal floatation.