Effect of slag composition on crystallization and melting properties during electroslag remelting process

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Abstract
This study investigates the continuous cooling crystallization behavior and melting properties of CaF 2 -CaO-Al 2 O 3 -MgO quaternary slags and CaF 2 -CaO-Al 2 O 3 -MgO-B 2 O 3 quinary slags during electroslag remelting. Experimental methods include X-Ray diffraction for phase analysis, scanning electron microscope for microstructure observation, the rotating cylinder method for viscosity measurement, and the hemispherical method for melting temperature determination, aiming to clarify the intrinsic relationship between slag composition and properties and provide a basis for ESR slag optimization and process control. Results show that in the quinary slag, as B 2 O 3 content decreases (from 3.0% to 1.2%), precipitated Ca 12 Al 14 O 33 crystals transform from elongated strips to large blocks. When B 2 O 3 content is below 2.1% (B3-B4), Ca 3 B 2 O 3 crystals no longer precipitate, confirming B 2 O 3 ’s refining effect. B 2 O 3 reduces both slags’ melting temperature, which decreases continuously with composition changes. The quaternary slag’s viscosity decreases, while the quinary slag’s viscosity remains stable, as B 2 O 3 regulates polymerization to offset viscosity fluctuations from other components.
Funding Information
  • National Natural Science Foundation of China (U24A20100)
  • National Natural Science Foundation of China (52474362)
  • National Natural Science Foundation of China (52174317)

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