Degradation mechanism of MgO–MgAl2O4 dual-phase refractory in contact with the automobile gear steel SCr420H with Si–Mn,Al and Ce–Al deoxidation |
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| Affiliation: | 1. School of Metallurgy, Northeastern University, NO.3-11, Wenhua Road, Heping District, Shenyang, 110819, China;2. State Key Laboratory of Rolling and Automation, Northeastern University, NO.3-11, Wenhua Road, Heping District, Shenyang, 110819, China;3. Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China;1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China;2. Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing, 100083, China;3. Vesuvius Advanced Ceramics (China) Co., Ltd, Suzhou, 215000, China;4. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, China;1. Yantai University, Yantai, 264005, Shandong, China;2. Department of Physics and Astronomy, KU Leuven, 3001, Leuven, Belgium;3. School of Materials Science and Engineering, University of Jinan, Jinan, 250022, China;4. Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), Shandong University, Jinan, 250061, China;5. School of Materials Science and Physics, China University of Mining and Technology, Xuzhou, 221116, China;1. Department of Physics, Materials Genome Institute and International Center for Quantum and Molecular Structures, Shanghai University, Shanghai, 200444, China;2. Key Laboratory of Polar Materials and Devices, Ministry of Education, Department of Electrical Engineering, East China Normal University, Shanghai, 200241, China;3. Shanghai Key Laboratory of High Temperature Superconductors, Shanghai University, Shanghai, 200444, China;1. Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China;2. College of Engineering, Dali University, Dali, 671003, China;1. Department of Mechanical Engineering, University of Idaho, Moscow, ID, 83844, USA;2. Mechanical & Industrial Engineering Department, IIT Roorkee, Roorkee, Uttarakhand, 247667, India;1. School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, China;2. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, 150001, China |
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| Abstract: | The current research, the degradation mechanism of MgO–MgAl2O4 dual-phase crucibles in contact with steel SCr420H with Si–Mn, Al, and Ce–Al deoxidation was investigated using a laboratory steelmaking experiment at 1873 K. The refractory interface in contact with the steel and inclusions was analysed using SEM and EPMA. In the case of Si–Mn deoxidation, the refractory's MgO phase was initially attacked by the dissolved Si, resulting in its transformation into the 2MgO–SiO2 phase, as confirmed by thermodynamic calculations. In the case of Al deoxidation, the reaction between the dissolved Al and the refractory had a significant effect on the increase in Mg concentration and MgAl2O4 inclusions. Refractory degradation was suppressed because the MgAl2O4 phase was an equilibrium phase based on thermodynamic consideration. The distribution of the MgAl2O4 phase in the refractory hindered the degradation reaction. The primary degradation mechanism in the case of Al deoxidation was steel penetration. In Ce–Al deoxidation, both Ce and Al were involved in refractory degradation. During this process, the MgO phase reacted with the dissolved Al, leading to its transformation into the MgAl2O4 phase, which was subsequently modified to the Ce–Al–O phase. Additionally, the MgAl2O4 phase was directly denatured into the Ce–Al–O phase. |
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| Keywords: | Refractories Corrosion MgO Interfaces |
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