| 钙处理对铝镇静钢中非金属夹杂物变性效果的影响 |
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| 引用本文： | 赵东伟, 包燕平, 王敏, 马文俊, 苏利川. 钙处理对铝镇静钢中非金属夹杂物变性效果的影响[J]. 工程科学学报, 2013, 35(9): 1138-1143. DOI: 10.13374/j.issn1001-053x.2013.09.005 |
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| 作者姓名： | 赵东伟 包燕平 王敏 马文俊 苏利川 |
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| 作者单位： | 1. 北京科技大学冶金与生态工程学院, 北京 100083; |
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| 基金项目： | 国家自然科学基金资助项目(51074019) |
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| 摘 要： | 通过对LF前-LF后-中间包-连铸工艺生产40Cr钢各环节系统取样,以及电子显微镜对夹杂物的形貌、尺寸及组成的分析,发现40Cr铸坯中含有大量CaO(CaS)-Al2O3-MgO类复合夹杂.采用Factsage计算得到的CaO-CaS-Al2O3三元相图对钙处理后CaO(CaS)-Al2O3夹杂形成过程进行了理论计算;并对实际发现的CaO(CaS)-Al2O3-MgO类复合夹杂物的面扫描分布进行描边处理,探讨了该类夹杂物的组成和形成过程.经Factsage理论计算发现,CaO-CaS-Al2O3三元相图中液相区各成分质量分数为CaO 32%~58%、CaS 0%~5%以及Al2O342%~65%,钙处理后CaO含量有逐渐增加,CaS含量有逐渐减小趋势.结合夹杂物的面扫描分布发现,CaO(CaS)-Al2O3-MgO类复合夹杂物的组成为xCaO·yAl2O3+mMgO·nAl2O3+Al2O3+CaS,钙处理后Ca能够使Al2O3变性为CaO-Al2O3,但同时夹杂物中也有很高的CaS成分,随着钙处理的充分进行,CaS将由内及外向CaO-Al2O3逐渐转变.
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| 关 键 词： | 炼钢 钙处理 夹杂物 改性 |
| 收稿时间： | 2012-07-07 |
Effectiveness of calcium treatment on nonmetallic inclusions in Al-killed steel |
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| ZHAO Dong-wei, BAO Yan-ping, WANG Min, MA Wen-jun, SU Li-chuan. Effectiveness of calcium treatment on nonmetallic inclusions in Al-killed steel[J]. Chinese Journal of Engineering, 2013, 35(9): 1138-1143. DOI: 10.13374/j.issn1001-053x.2013.09.005 |
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| Authors: | ZHAO Dong-wei BAO Yan-ping WANG Min MA Wen-jun SU Li-chuan |
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| Affiliation: | 1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China;2. Technology Center, Hangzhou Iron and Steel Group Company, Hangzhou 310022, China |
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| Abstract: | Massive CaO(CaS)-Al2O3-MgO complex inclusions were found in 40Cr casting billet samples based on systematic sampling during the processes of before LF-after LF-tundish-continuous casting and electron microscopy analysis on inclusion morphology, size and composition. The formation of CaO(CaS)-Al2O3 complex inclusions was the-oretically calculated in the CaO-CaS-Al2O3 ternary phase diagram obtained by Factsage; the composition and formation process of CaO(CaS)-Al2O3-MgO complex inclusions were studied by further stroke treatment on surface scan distribu-tion. Factsage calculations show that the contents of components in the liquid region of the CaO-CaS-Al2O3 ternary phase diagram are 32% to 58% CaO, 0% to 5% CaS, and 42% to 65% Al2O3. The CaO content increases and the CaS content decreases gradually after calcium treatment. In combination with the scanning plane distribution of inclusions, it is found that the CaO(CaS)-Al2O3-MgO complex inclusions are xCaO·yAl2O3+mMgO·nAl2O3+Al2O3+CaS. Moreover, Ca can make Al2O3 become CaO-Al2O3 while the inclusions have very high CaS content after calcium treatment. Along with calcium treatment carrying on, CaS will gradually transform into CaO-Al2O3 from the inner to the outward. |
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| Keywords: | steelmaking calcium treatment inclusions modification |
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