首页|Effect of MgO on structure and crystallization behavior of CaO-SiO2-Al2O3 inclusions in Si-Mn deoxidized steel
Effect of MgO on structure and crystallization behavior of CaO-SiO2-Al2O3 inclusions in Si-Mn deoxidized steel
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To avoid coarse crystallization of glassy inclusions in Si-Mn deoxidized steel during hot rolling,the effect of MgO on the structure and crystallization behavior of CaO-SiO2-Al2O3 inclusions was investigated.The results showed that the crystallization temperature of the oxide melts decreased with increasing MgO content from 0 to 15.7 wt.％,which suggested that the addition of MgO would increase the temperature range of the crystalline transition.The increase in MgO content could decrease the crystallization activation energy of inclusions.With the increase in MgO content,the relative fractions of QSi0 and QSi1 structure units increased,and those of structure units QSi2,QSi3,and QSi4 decreased,increasing the depolymerization degree of the silicate structure.The crystallization ratio of glassy inclusions in the steel crucible increased from 19.7％to 98.3％with increasing MgO content from 0 to 15.7 wt.％.The addition of MgO improved the crystallization ability of inclusions,because MgO provides free oxygen O2-to destroy the bridging oxygens and form non-bridging oxygens O-,which depolymerizes silicate network structure and simplifies the[SiO4]-tetrahedral structure.In addition,MgO would promote the precipitation of the Mg-containing phases with a high melting point.When the MgO content was increased above 12.1 wt.％,MgO·Al2O3 and 2MgO·SiO2 crystalline phases would precipitate from the inclusions.
The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China
Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steelmaking,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China
Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China
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