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鋼中非金屬夾雜物形態對其去除行為的影響

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

  • 摘要: 采用物理模擬手段研究球形、立方體、圓柱體、樹枝狀、團簇狀等鋼中常見形狀夾雜物形狀修正系數的差異性,并分析粒子表面形貌和運動取向對形狀修正系數的影響.粒子的形狀修正系數與阻力系數滿足線性正相關,可以用形狀修正系數評價粒子的上浮去除能力;在體積相同情況下,同類型夾雜物粒子的去除能力依次為樹枝狀(垂直)<粗糙球形<立方體<圓柱(半經6 mm)<圓柱(半經4 mm)<樹枝狀(水平)<團簇狀(水平)<光滑球形;粗糙表面的球形其表面積約為光滑球形的2倍,其形狀修正系數同時增加2.1倍.簡單粒子的形狀修正系數受運動取向影響較小,復雜粒子則受運動取向影響較大,樹枝狀顆粒垂直上浮時的形狀修正系數約為水平上浮時的2倍.

     

    Abstract: 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.

     

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