工程科学学报 (Dec 2018)
Influence of TiO2 content on the physical properties of the CaF2—Al2O3-CaO—MgO—TiO2 five yuan electroslag remelting system
Abstract
The addition of Ti O2during 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 F2-Al2O3-Ca O-MgO, and different contents of Ti O2was designed for ESR of superalloys.The effects of Ti O2content 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 O2content and the formation of a low-melting-point phase.The addition of Ti O2can 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 O2content 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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