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<p>The crystallization and viscosity characteristics of ESR-type slags with different TiO<sub>2</sub> contents were investigated. The influence of the crystallization characteristics of the slag on heat transfer and in-mold performance was investigated through the ESR pilot trials. The results indicate that as the TiO<sub>2</sub> content of CaF<sub>2</sub>-CaO-Al<sub>2</sub>O<sub>3</sub>-MgO-(TiO<sub>2</sub>) slag is increased from 3 to 13&#xa0;mass&#xa0;pct, the crystallization temperature of the slag increases from 1531.14&#xa0;K (1258.14&#xa0;°C) to 1579.9&#xa0;K (1306.9&#xa0;°C), and the crystallization ability of the slag is enhanced. Increasing the TiO<sub>2</sub> content in the slag facilitates the formation of CaTiO<sub>3</sub> and significantly increases both the size and amount of CaTiO<sub>3</sub> crystals. As the TiO<sub>2</sub> content of the slag is increased, the degree of polymerization of the slag increases, resulting in an increase in the viscosity of the slag. The increase in the thermodynamic driving force for the precipitation of CaF<sub>2</sub> and CaTiO<sub>3</sub> is the dominant factor contributing to the enhancement of slag crystallization. Compared with the slag with 3&#xa0;mass&#xa0;pct TiO<sub>2</sub>, the total heat flux across the slag film in the mold is reduced due to the presence of a greater number of CaTiO<sub>3</sub>, CaF<sub>2</sub>, Ca<sub>12</sub>Al<sub>14</sub>F<sub>2</sub>O<sub>32</sub> and MgAl<sub>2</sub>O<sub>4</sub> crystals in the 8&#xa0;mass&#xa0;pct TiO<sub>2</sub>-bearing slag, and the stronger crystallization ability resulting in thicker crystalline layer of the slag film. The slag with 3&#xa0;mass&#xa0;pct TiO<sub>2</sub> provides stable horizontal heat transfer due to the formed uniform thin slag film in the mold during the ESR, which consequently brings sound surface quality of the remelted ingots.</p>

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Development of the Slag for Electroslag Remelting of Ti-containing Alloy: Role of TiO2 on the Crystallization, Viscosity and In-mold Performance

  • 期刊论文

  • 发表日期：

    2025年2月21日

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  • Huai Zhang,
  • Chengbin Shi,
  • Hui Wang

摘要

The crystallization and viscosity characteristics of ESR-type slags with different TiO2 contents were investigated. The influence of the crystallization characteristics of the slag on heat transfer and in-mold performance was investigated through the ESR pilot trials. The results indicate that as the TiO2 content of CaF2-CaO-Al2O3-MgO-(TiO2) slag is increased from 3 to 13 mass pct, the crystallization temperature of the slag increases from 1531.14 K (1258.14 °C) to 1579.9 K (1306.9 °C), and the crystallization ability of the slag is enhanced. Increasing the TiO2 content in the slag facilitates the formation of CaTiO3 and significantly increases both the size and amount of CaTiO3 crystals. As the TiO2 content of the slag is increased, the degree of polymerization of the slag increases, resulting in an increase in the viscosity of the slag. The increase in the thermodynamic driving force for the precipitation of CaF2 and CaTiO3 is the dominant factor contributing to the enhancement of slag crystallization. Compared with the slag with 3 mass pct TiO2, the total heat flux across the slag film in the mold is reduced due to the presence of a greater number of CaTiO3, CaF2, Ca12Al14F2O32 and MgAl2O4 crystals in the 8 mass pct TiO2-bearing slag, and the stronger crystallization ability resulting in thicker crystalline layer of the slag film. The slag with 3 mass pct TiO2 provides stable horizontal heat transfer due to the formed uniform thin slag film in the mold during the ESR, which consequently brings sound surface quality of the remelted ingots.