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| Evolution of MnS and MgO·Al2O3 inclusions in AISI M35 steel during electroslag remelting |
| Ding-li Zheng1,2, Guo-jun Ma1,2, Xiang Zhang1,2, Meng-ke Liu1,2, Zhi Li1,2 |
1 Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steelmaking, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China
2 State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China |
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Abstract Thermodynamics and kinetics of dissociation and precipitation of MnS inclusions, as well as the effect of reoxidation in liquid steel on MgO·Al2O3 inclusions in AISI M35 steel during electroslag remelting (ESR) process were investigated. The inclusions found in the consumable electrode were MnS, MgO·Al2O3 and MnS adhering to MgO·Al2O3. MnS inclusions were nearly spherical and ellipse in morphology, and most of them were less than 2 μm in size. MgO·Al2O3 inclusions were polygonal and nearly spherical and most about 1–4 μm in size. The inclusions in ESR ingot observed by scanning electron microscopy–energy-dispersive X-ray spectrometer were polygonal and nearly spherical MgO·Al2O3. MnS inclusions in the consumable electrode were completely dissociated before the liquid film dripping into molten slag pool. The controlling step of MnS inclusions dissociation was the mass transfer of [Mn] in the liquid steel. During the solidification process, the thermodynamic driving force could not meet MnS inclusions precipitation before the solid fraction exceeds 0.996, and the kinetics condition is too poor for the growth of MnS inclusions in the steel when the solid fraction is larger than 0.996. MgO·Al2O3 inclusions in ESR ingot originated from the remained MgO·Al2O3 inclusions in consumable electrode and the fresh ones formed by the reaction between dissolved magnesium, oxygen and aluminum in liquid steel.
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Received: 19 August 2021
Published: 25 December 2021
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| Cite this article: |
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Ding-li Zheng,Guo-jun Ma,Xiang Zhang, et al. Evolution of MnS and MgO·Al2O3 inclusions in AISI M35 steel during electroslag remelting[J]. Journal of Iron and Steel Research International, 2021, 28(12): 1605-1616.
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2021, Vol. 28 
