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| Effect of order of deoxidant addition on Al-Ti composite inclusions |
| WANG Lin-zhu1, LI Xiang2, ZHAO Yu-dong1, YANG Shu-feng3, LI Jun-qi1, CHEN Chao-yi1 |
1. College of Materials and Metallurgy, Guizhou University, Guiyang 550025, Guizhou, China;
2. School of Materials and Energy Engineering, Guizhou Institute of Technology, Guiyang 550003, Guizhou, China;
3. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China |
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Abstract Parameters such as morphology, composition, size, quantity and distribution of inclusions in steel with different order of Al-Ti deoxidation addition were detected and analyzed by SEM-EDS. Chemical reactions in liquid steel in the deoxidation process were analyzed and the predominance diagram of inclusion was obtained by thermodynamic calculation. The results indicate the order of deoxidant addition had a great influence on the morphology of inclusions. When Ti was added prior to Al, many Al-Ti composite inclusions containing Fe phase with concentration gradient ("hollow”) formed in the liquid steel. The radial length of inclusions increases, and inclusions are more likely to be partial. So this deoxidation method is not conducive to refining and dispersing inclusions. When Al was added prior to Ti, alumina is formed in the steel, which will not be reduced by dissolved titanium, so the inclusion does not contain iron phase inside. The inclusions are mainly Al-Ti-O (-N) inclusions. The size and quantity of inclusions are less than Ti was added prior to Al.The formation and evolution mechanism of inclusions under different Al-Ti deoxidation order and the formation mechanism of Al-Ti composite inclusions with "hollow structure" with concentration gradient was explored and analyzed based on the results of FactSage calculation, chemical reaction analysis, and experimental detection. The effect of the addition order of deoxidizer on the size, number and distribution of inclusions was discussed. It is found that under the deoxygenation mode of adding titanium first and then aluminum, titanium oxides will react with aluminum metal, titanium oxides will gradually change into "hollow" alumina shell, while dissolved aluminum, titanium and oxygen oxidation reaction, forming a concentration gradient of Al2O3-TiOx complex inclusions, and finally titanium oxide completely converted into alumina shell and disappear. With the filling of iron liquid, an aluminum titanium inclusion containing iron phase is formed.
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Received: 18 March 2021
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2021, Vol. 56 
