| MECHANISM AND KINETICS OF TRANSFORMATION OF ALUMINA INCLUSIONS BY CALCIUM TREATMENT |
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| 引用本文： | Z.J. Han L. Liu M. Lind L. Holappa. MECHANISM AND KINETICS OF TRANSFORMATION OF ALUMINA INCLUSIONS BY CALCIUM TREATMENT[J]. 金属学报(英文版), 2006, 19(1): 1-8. DOI: 10.1016/S1006-7191(06)60017-3 |
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| 作者姓名： | Z.J. Han L. Liu M. Lind L. Holappa |
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| 作者单位： | [1]Central Iron and Steel Research Institute, Beijing 100081, China [2]Laboratory of Metallurgy, Helsinki University of Technology, P.O. Box 6200,Espoo 02015, Finland |
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| 摘 要： | The basic mechanism and kinetics of the transformation process of alumina inclusions in steel was reported when calcium introduced into the steel by wire feeding orpowder injection. To clarify the mechanisms model, experiments were performed by studying reactions between AltOs and CaO in a laboratory furnace and by performing calcium treatments in an 8kg induction furnace for Al deoxidised melt. The phases formed during the reaction between Al2O3 and CaO were examined by SEM-EDS （scanning electron microscope-energy dispersive spectrometer）, and the reaction sequence of Al2O3=〉 CA6=〉 CA2 =〉 CA =〉 CAx（l） was discussed in term of the experimental observations. The kinetics of the reaction of calcium with alumina inclusions were simulated by immersing alumina plates in a Ca treated steel melt in the induction furnace. Results were compared with observations of real inclusion transformation. A kinetic model was proposed based on the results.
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| 关 键 词： | 钙处理 氧化铝 机械性能 动力学 转变过程 |
| 收稿时间： | 2005-02-02 |
| 修稿时间： | 2005-06-03 |
Mechanism and Kinetics of Transformation of Alumina Inclusions by Ca Treatment |
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| Z.J. Han,L. Liu,M. Lind,L. Holappa. Mechanism and Kinetics of Transformation of Alumina Inclusions by Ca Treatment[J]. Acta Metallurgica Sinica(English Letters), 2006, 19(1): 1-8. DOI: 10.1016/S1006-7191(06)60017-3 |
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| Authors: | Z.J. Han L. Liu M. Lind L. Holappa |
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| Affiliation: | 1. Central Iron and Steel Research Institute, Beijing 100081, China;2. Laboratory of Metallurgy, Helsinki University of Technology, P.O. Box 6200, Espoo 02015, Finland;1. Research Institute, Baoshan Iron and Steel Co., Ltd., Shanghai 201900, China;2. State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, Shanghai 200240, China;1. Institute of Modern Physics, Fudan University, Shanghai 200433, China;2. Institute of Radiation Medicine, Fudan University, Shanghai 200032, China |
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| Abstract: | Calcium treatment is nowadays a well-established method to improve steel castability and final properties e.g. machinability, toughness and surface quality. The effects of calcium are mainly based on its strong ability to form sulphides and oxides. The topic of the present paper concerns the basic mechanism and kinetics of the transformation process of alumina inclusions in steel when calcium introduced into the steel e.g. by wire feeding or powder injection. To clarify the mechanisms model experiments were performed by studying reactions between Al2O3 and CaO in a laboratory furnace as well as by performing Ca treatments in an 8 kg induction furnace for Al deoxidised melt. The phases formed during the reaction between Al2O3 and CaO were examined by SEM-EDS, and the proposed reaction sequence of Al2O3CA6CA2CACAx(liquid) was discussed based on the experimental observations. The kinetics of the reaction of calcium with alumina inclusions were simulated by immersing alumina plates in a Ca treated steel melt in the induction furnace. Results were compared with observations of real inclusion transformation. Based on the results a kinetic model was proposed. |
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| Keywords: | mechanism kinetics alumina inclusion transformation |
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