Characteristics of inclusions in high-Al steel during electroslag remelting process |
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| Authors: | Cheng-bin Shi Xi-chun Chen Han-jie Guo |
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| Institution: | 1.State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing,China;2.School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing,China;3.Research Institute of High Temperature Materials,Central Iron and Steel Research Institute,Beijing,China |
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| Abstract: | The characteristics of inclusions in high-Al steel refined by electroslag remelting (ESR) were investigated by image analysis,
scanning electron microscopy (SEM), and energy-dispersive spectrometry (EDS). The results show that the size of almost all
the inclusions observed in ESR ingots is less than 5 μm. Inclusions smaller than 3 μm take nearly 75% of the total inclusions
observed in each ingot. Inclusions observed in ESR ingots are pure AlN as dominating precipitates and some fine spherical
Al2O3 inclusions with a size of 1 μm or less. It is also found that protective gas operation and slag deoxidation treatment during
ESR process have significant effects on the number of inclusions smaller than 2 μm but little effects on that of inclusions
larger than 2 μm. Thermodynamic calculations show that AlN inclusions are unable to precipitate in the liquid metal pool under
the present experimental conditions, while the precipitation of AlN inclusions could take place at the solidifying front due
to the microsegregation of Al and N in liquid steel during solidification. |
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