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The modification of alumina (Al2O3) inclusionsInclusion by the rare earthRare earth element yttriumYttrium (Y) has attracted increasing attention due to its significant effects on inclusion morphologyInclusion morphology, steel cleanlinessSteel cleanliness, and mechanical propertiesMechanical properties. In this study, the thermodynamicThermodynamic stability and kineticKinetic behavior of Y-modified Al2O3 were investigated to elucidate the mechanisms of inclusionInclusion transformation in steelmakingSteelmaking. Thermodynamic analysesThermodynamic analysis based on the Y-Al-O system were conducted to determine the stability regions of Al2O3, Y2O3, and Y-Al-O complex oxides. The results indicate that Y has a strong affinity for O and can effectively transform Al2O3 into yttriumYttrium-rich phases such as YAlO3 under appropriate conditions. Dynamic calculation further revealed that the reactions between rare earthRare earth and Al2O3 inclusionsInclusion were first-order reactions. A transformation model was established to describe the modification processProcess of inclusionInclusion during smeltingSmelting. This work provides valuable guidance for optimizing Y addition strategies and improving inclusionInclusion control in steelmakingSteelmaking.

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Yttrium Modification of Alumina in Molten Iron: Thermodynamics and Kinetics

  • 会议论文

  • 发表日期：

    2026年

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  • Jian Kang,
  • Zheyang Lin,
  • Hongpo Wang,
  • Juntong Shen,
  • Yu Wang

摘要

The modification of alumina (Al2O3) inclusionsInclusion by the rare earthRare earth element yttriumYttrium (Y) has attracted increasing attention due to its significant effects on inclusion morphologyInclusion morphology, steel cleanlinessSteel cleanliness, and mechanical propertiesMechanical properties. In this study, the thermodynamicThermodynamic stability and kineticKinetic behavior of Y-modified Al2O3 were investigated to elucidate the mechanisms of inclusionInclusion transformation in steelmakingSteelmaking. Thermodynamic analysesThermodynamic analysis based on the Y-Al-O system were conducted to determine the stability regions of Al2O3, Y2O3, and Y-Al-O complex oxides. The results indicate that Y has a strong affinity for O and can effectively transform Al2O3 into yttriumYttrium-rich phases such as YAlO3 under appropriate conditions. Dynamic calculation further revealed that the reactions between rare earthRare earth and Al2O3 inclusionsInclusion were first-order reactions. A transformation model was established to describe the modification processProcess of inclusionInclusion during smeltingSmelting. This work provides valuable guidance for optimizing Y addition strategies and improving inclusionInclusion control in steelmakingSteelmaking.