精炼渣中Al<sub>2</sub>O<sub>3</sub>含量对弹簧钢中夹杂物的影响

精炼渣中Al₂O₃含量对弹簧钢中夹杂物的影响

摘要: 利用Factsage热力学软件，探讨Al₂O₃含量对CaO-SiO₂-Al₂O₃-MgO系及CaO-SiO₂-Al₂O₃-MnO系相图低熔点区域的影响，可知在Al₂O₃含量（质量分数）为15%时，对应的各相图中低熔点区域面积所占百分数最大；通过研究Al₂O₃含量对弹簧钢中夹杂物的影响，表明随着精炼渣中Al₂O₃含量增加，钢中带有棱角的Al₂O₃夹杂物增多，钢中夹杂物分布变得相对集中.在碱度为1.2，Al₂O₃含量为8%时，可将夹杂物控制在相图的低熔点区域内，此时对应夹杂物形貌多为球形，且尺寸约为5μm.

Abstract: The composition of inclusions in low melting point area of CaO-SiO₂-Al₂O₃-MgO system and CaO-SiO₂-Al₂O₃-MnO system was analyzed by thermodynamic calculation,and the influence of Al₂O₃ content on inclusions in steel was studied. It is found that,at the Al₂O₃ content of 15wt%,the corresponding low melting point area of phase diagram takes the largest percentage. The angular Al₂O₃ inclusions increase by the increase of Al₂O₃ content,and the distribution of inclusions in steel becomes relatively concentrated.In the basicity of 1.2 and the Al₂O₃ content of 8wt%,the inclusions can be controlled in low melting point area of phase diagram,the corresponding shape of inclusions is spherical with the size of about 5 μm.