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| 精炼渣对60Si2Mn弹簧钢中氧含量及夹杂物的影响 |
| Effect of refining slag on oxygen content and inclusions in 60Si2Mn spring steel |
| 投稿时间：2017-02-21 |
| DOI： |
| 中文关键词: 60Si2Mn弹簧钢 CaO-SiO2-Al2O3-MgO精炼渣 全氧含量 非金属夹杂物 SiO2活度 |
| 英文关键词: 60Si2Mn spring steel CaO-SiO2-Al2O3-MgO refining slag T[O] content non-metallic inclusion activity of SiO2 |
| 基金项目:中国博士后科学基金资助项目(2016M590722). |
| 作者 | 单位 | E-mail | | 张晓锟 | 武汉科技大学省部共建耐火材料与冶金国家重点实验室,湖北 武汉,430081 | 408669091@qq.com | | 倪红卫 | 武汉科技大学省部共建耐火材料与冶金国家重点实验室,湖北 武汉,430081 | | | 王宝 | 武汉科技大学省部共建耐火材料与冶金国家重点实验室,湖北 武汉,430081 | | | 张华 | 武汉科技大学省部共建耐火材料与冶金国家重点实验室,湖北 武汉,430081 | | | 刘成松 | 武汉科技大学省部共建耐火材料与冶金国家重点实验室,湖北 武汉,430081 | | | 吕泽安 | 武汉科技大学省部共建耐火材料与冶金国家重点实验室,湖北 武汉,430081 | |
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| 中文摘要: |
| 利用热力学软件FactSage 7.0计算1873 K下四元渣系CaO-SiO2-Al2O3-MgO与60Si2Mn弹簧钢平衡时的等氧线,通过渣-钢高温平衡试验,测定了不同精炼渣方案下钢中溶解氧和全氧含量,并对钢中非金属夹杂物的形貌、数量和尺寸分布进行表征。结果表明,1873 K温度下,w(MgO)=6%且w(CaO)/w(Al2O3)=1时,钢液中溶解[O]及T[O]含量随着渣中w(SiO2)的增大而增加,而当w(SiO2)=30%时,随着w(CaO)/w(Al2O3)的增加,钢液中溶解[O]及T[O]含量分别呈降低和升高的趋势,这与钢液中SiO2的活度有关；不同精炼渣方案得到的钢中,尺寸小于10 μm的夹杂物所占比例超过87%,尺寸小于4 μm的夹杂物所占比例超过50%,且单位面积夹杂物的数量与钢中T[O]含量的变化趋势一致。与试验结果对比可知,利用热力学软件FactSage 7.0计算钢中溶解氧含量是可行的。 |
| 英文摘要: |
| In this paper, the iso-w[O] lines in CaO-SiO2-Al2O3-MgO slag system in equilibrium with 60Si2Mn molten steel at 1873 K were calculated by thermodynamic software FactSage 7.0. Through slag-steel equilibrium test, the contents of dissolved oxygen and total oxygen in molten steel obtained by different refining slag schemes were measured,and the morphology,amount and size distribution of inclusions in steel samples were also characterized. The results show that, when w(MgO) is 6% and w(CaO)/w(Al2O3) equals 1, the contents of dissolved [O] and T[O] in molten steel increase with the increase of w(SiO2) in slag at 1873 K, while the T[O] content increases and the dissolved [O] content decreases with the increase of w(CaO)/w(Al2O3) when w(SiO2) is 30%, which is related to the activity of SiO2 in molten steel. What’s more, in steel samples obtained by different refining slag schemes, the propotion of inclusions with size less than 10 μm and 4 μm is more than 87% and 50%, respectively, and the variation of inclusion amounts per unit area is consistent with the change of T[O] content in steel. Compared with experimental results, it’s feasible to predict the dissolved oxygen content by thermodynamic software FactSage 7.0. |
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