GCr15轴承钢精炼渣对夹杂物祛除行为的研究

Study on Behavior of Inclusions Removal from GCr15 Bearing Steel by Refining Slag

通过建立的夹杂物穿越钢渣界面运动模型,研究了精炼渣对夹杂物的吸附现象。结果表明,夹杂物粒径、表面张力和熔渣粘度是影响夹杂物冲破钢渣界面的重要参数,大型夹杂物中粒径和熔渣粘度起决定作用,而≤20μm级别的小型夹杂物中仅表面张力起决定作用;大型夹杂物冲破钢渣界面的能力远大于小型夹杂物。针对小型夹杂物难以吸附的问题,运用了夹杂物运动模型和熔渣、钢液表面张力模型,研究了表面张力对吸附过程的影响。结果表明,直径≤122.9μm尺寸的夹杂物均无法穿越钢渣界面,回弹至钢液一侧,由此得出:无法通过调整精炼渣用以吸附≤122.9μm夹杂物以达到进一-步降低钢中氧含量的目的。

By established a model of inclusions dynamic at the steel-slag interface the refining slag absorbing inclusions phenomenon is studied.Results show that certain parameters,i.e.particle size,interfacial tension and slag viscosity,determine the inclusions transfer behavior.Particle size and interfacial tension determine definitely large size inclusions transfer behavior,while interfacial tension only determines definitely micro size inclusions rating≤20 μm transfer behavior.Macro-sizes affects the inclusions displacement more than the Micro-sizes.For the removal of Micro-inclusions,by inclusions mathematical dynamic model coupled by steel and slag surface tension models,the effect of interfcial tension on obsorbing process has been studied.It is obvious that the particles blow 122.9 μm size could be rebounded into steel when they are flowed to steel-slag interface layer.It is obtained that there is no way by re-designing refining slags to effectively remove≤122.9 μm micro-inclusions from steel to slag layer and further to get the aim to decrease the oxygen content in steel.