Influence of TiO2 content on the physical properties of the CaF2—Al2O3-CaO—MgO—TiO2 five yuan electroslag remelting system
2018
SHI Shuai | GENG Xin | JIANG Zhou-hua | LI Hua-bing | XU Fang-hong | WANG Li-xin
The addition of Ti O<sub>2</sub>during the electroslag remelting (ESR) of Ti-containing superalloys can restrain the loss of Ti elements.The physical properties of the slag system are related to the smooth operation of smelting and the excellent quality of products.A five-membered slag system composed of Ca F<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub>-Ca O-MgO, and different contents of Ti O<sub>2</sub>was designed for ESR of superalloys.The effects of Ti O<sub>2</sub>content on the melting point, viscosity, density, optical alkalinity, electrical conductivity, and other physical parameters of the slag were studied.Resultsshow that the melting temperature range of the slag is 1264-1296℃.In addition, the melting point of the slag decreases gradually with the increase in Ti O<sub>2</sub>content and the formation of a low-melting-point phase.The addition of Ti O<sub>2</sub>can decrease the viscosity of the slag, and this viscosity in the high-temperature region (1350-1550℃) only slightly changes, thereby improving the surface-forming quality of the ESR ingot.The electrical conductivity, optical basicity, and density of the slag system decrease with the increasing Ti O<sub>2</sub>content from 0%to 9%of the mass fraction.The density and optical alkalinity show no considerable changes, and the five groups of slag are in line with the ESR on the density and optical alkalinity requirements.
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