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通过实验研究了氧含量对硫化物形态的影响.结果表明:随着氧含量的增加,MnS夹杂物的形态由Ⅱ类向Ⅰ类转变,其平均直径和面积分数增大,数量减少,长宽比减小.通过数学模型以及Fe-Mn-S和Fe-Mn-S-O体系的四元相图研究了氧含量对硫化物形态产生影响的机理.在氧质量分数高达0.022%时,凝固初期形成了大量的MnO系低熔点液态氧化物,促进了MnS的形成方式从共晶方式向偏晶方式转变,形成Ⅰ类MnS;氧质量分数在0.01%以下时,凝固初期形成的MnO系低熔点液态氧化物较少,大部分MnS是在凝固末期以共晶形式析出,形成Ⅱ类MnS.
The effect of oxygen content on the morphology of sulfides was investigated experimentally.The results show that with the increase of oxygen content, the morphology of MnS inclusions changes from class Ⅱ to class Ⅰ, the average diameter and area fraction increase, the number decreases, the length and width The mechanism of the effect of oxygen content on the morphology of the sulfide has been studied by the mathematical model and the quaternary phase diagram of the Fe-Mn-S and Fe-Mn-SO system.When the oxygen content reaches 0.022% A large amount of MnO-based low-melting point liquid oxides promote the formation of MnS from eutectic to non-crystallized and form type I MnS. When the mass fraction of oxygen is less than 0.01%, the MnO-based low-melting liquid Oxides less, most of the MnS is precipitated in the form of eutectic at the end of solidification to form Class II MnS.