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为了优化55SiCrA弹簧钢中夹杂物的组成和形态,采用热力学软件Factsage分别研究了CaO、SiO_2含量对CaO-SiO_2-Al_2O_3-MgO与CaO-SiO_2-Al_2O_3-MnO系相图低熔点区域面积的影响,研究结果表明:随着CaO和SiO_2含量的增加,CaO-SiO_2-Al_2O_3-MnO系相图低熔点区域面积分数逐步增大;在CaO-SiO_2-Al_2O_3-MgO系中,当CaO的质量分数为40%,SiO_2的质量分数为50%时,对应相图的低熔点区域面积最大。同时,研究了不同碱度的精炼渣对钢样中夹杂物的影响,结果表明:当精炼渣的Al_2O_3含量相同时,随着精炼渣碱度的增大,夹杂物中Al_2O_3的含量不断增加,其成分逐渐偏离低熔点区域。当精炼渣中Al_2O_3的质量分数为8%,碱度为1.2时,可得到低熔点的塑性夹杂物,形貌多为球形,尺寸在5μm以下。
In order to optimize the composition and morphology of inclusions in 55SiCrA spring steel, Factsage of software Thermodynamics was used to investigate the effects of CaO and SiO_2 on the area of low melting point of CaO-SiO_2-Al_2O_3-MgO and CaO-SiO_2-Al_2O_3- The results show that the area fraction of low melting point region of CaO-SiO_2-Al_2O_3-MnO phase diagram increases with the increase of CaO and SiO_2 content. In the CaO-SiO_2-Al_2O_3-MgO system, when the mass fraction of CaO is 40 %, When the mass fraction of SiO 2 is 50%, the area of the low melting point region corresponding to the phase diagram is the largest. At the same time, the effect of refining slag with different basicity on inclusions in steel samples was studied. The results show that with the increase of basicity of refining slag, the content of Al 2 O 3 in inclusions increases with the same Al 2 O 3 content, Its composition gradually deviates from the low melting point area. When the mass fraction of Al 2 O 3 in the refining slag is 8% and the basicity is 1.2, low melting point plastic inclusions can be obtained. The morphology is mostly spherical and the size is below 5 μm.