稀土钇对SWRS82B硬线钢中B类夹杂物的变性行为影响

Effect of Rare Earth Yttrium on Denaturation Behavior of Class B Inclusions in SWRS82B Hard Wire Steel

为了明确SWRS82B钢中稀土元素对棱角分明的B类夹杂物(氧化铝)变性行为,通过扫描电子显微镜和能谱分析仪研究了钇的不同添加量对氧化铝夹杂物的成分、形态、尺寸的影响。基于夹杂物粒子间可能存在的运动(布朗碰撞、斯托克斯碰撞以及湍流碰撞)推测了稀土钇添加量使得氧化铝夹杂物改性且弥散化的原因。用计算结果和试验结果探讨了稀土钇对SWRS82B硬线钢中B类夹杂物的变性行为。结果表明,钇添加量为0.026%的试验样品中具有最佳的夹杂物特征,平均夹杂物尺寸相对未加钇的减小了7.8μm。钢液中夹杂物粒子间的碰撞主要以斯托克斯碰撞为主,夹杂物的碰撞会使原本大尺寸的氧化铝夹杂物转变为小颗粒的稀土复合夹杂。

In order to clarify the denaturation behavior of rare earth elements in SWRS82 B steel to angular B-type inclusions(alumina), the influence of different additions of yttrium on the composition, morphology and size of alumina inclusions was studied by scanning electron microscope and energy spectrum analyzer. Based on the possible movement between the inclusion particles(Brown collision, Stokes collision and turbulent collision), the reason for the modification and dispersion of alumina inclusions was inferred. The denaturation behavior of rare earth yttrium on type B inclusions in SWRS82 B hard steel was discussed with calculation and test results. The results show that the test samples with yttrium addition of 0.026% have the best inclusion characteristics, and the average inclusion size in steel is reduced by 7.8 μm compared with that of steel without yttrium. The collisions between particles of inclusions in molten steel are mainly Stokes collisions. The collisions of inclusions will transform the originally large-sized alumina inclusions into small-particle rare-earth composite inclusions.