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FactSage对钙处理前后钢液的平衡计算以及典型夹杂物在CaO-CaS-Al2O3三元相图中演变规律的研究结果表明:钢中硫含量大于0.01%(质量分数,下同)时,难以得到理想的钙处理效果,主要原因在于钙处理过程中钙主要与硫结合生成CaS夹杂,同时少部分钙将对Al2O3进行变性;钙处理过程中CaO(CaS)-Al2O3演变规律为Al2O3→Al2O3+CaO.6Al2O3+CaS→CaO.2Al2O3+CaS(CaO含量较少)→Al2O3.CaO+CaS(CaO含量较多)。通过对复合夹杂物电镜面分布扫描结果的描边处理能够有效辨别复合夹杂物的成分,发现典型CaO(CaS)-Al2O3-MgO夹杂物成分为xCaO.yAl2O3+xMgO.yAl2O3+Al2O3+CaS,并据此提出了一种新的评价钙处理效果的方法。
FactSage’s calculation of the balance of molten steel before and after calcium treatment and the evolution of typical inclusions in the ternary phase diagram of CaO-CaS-Al 2 O 3 show that it is difficult to obtain the sulfur content of more than 0.01% (mass fraction) The main reason for the ideal calcium treatment is that calcium is mainly combined with sulfur to form CaS inclusions during calcium treatment, while a small part of calcium will denature Al203. The evolution of CaO (CaS) -Al2O3 during Ca treatment is Al2O3 → Al2O3 + CaO .6Al2O3 + CaS → CaO.2Al2O3 + CaS (less CaO) → Al2O3.CaO + CaS (more CaO). The composition of typical inclusions of CaO (CaS) -Al2O3-MgO inclusions is found to be xCaO.yAl2O3 + xMgO.yAl2O3 + Al2O3 + CaS by stroking the result of scanning electron microscopy (SEM) Accordingly, a new method of evaluating the effect of calcium treatment is proposed.