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<p>Macrosegregation is a typical defect in the titanium alloy ingots prepared by vacuum arc remelting (VAR), which is related to the processability and performance afterward. Herein, the iron macrosegregation behavior and mechanism in a Ti-4.7Al-3V-2Mo-1.85Fe alloy ingots are studied by the industrial experiments and numerical simulations. The results show that the melting parameters influence the segregation by changing the width of mushy zone and the depth of molten pool. The values of the two characteristics increase as the melting current and stirring intensity grow, forming a deeper V-shaped molten pool and intensifying the segregation. Stirring period does&#xa0;not aggravate the segregation much but improves the surface quality of the ingots. Carefully designed low melting current, weak stirring intensity, and long stirring cycle are beneficial for lowering the macrosegregation extent, which reduces the maximum iron segregation concentration from 2.70 to 2.05 wt.% in practice. This work can provide guidance for the mass production of titanium alloy ingots with the easy-to-segregate elements.</p>

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Macrosegregation in Vacuum Arc Remelted Ti-4.7Al-3V-2Mo-1.85Fe Alloy: Industrial-Scale Ingot and Numerical Simulation

  • 期刊论文

  • 发表日期：

    2025年2月3日

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  • P. F. Yun,
  • J. H. Cao,
  • Y. H. Shi,
  • H. Liu,
  • Y. K. Wu,
  • F. Jiang

摘要

Macrosegregation is a typical defect in the titanium alloy ingots prepared by vacuum arc remelting (VAR), which is related to the processability and performance afterward. Herein, the iron macrosegregation behavior and mechanism in a Ti-4.7Al-3V-2Mo-1.85Fe alloy ingots are studied by the industrial experiments and numerical simulations. The results show that the melting parameters influence the segregation by changing the width of mushy zone and the depth of molten pool. The values of the two characteristics increase as the melting current and stirring intensity grow, forming a deeper V-shaped molten pool and intensifying the segregation. Stirring period does not aggravate the segregation much but improves the surface quality of the ingots. Carefully designed low melting current, weak stirring intensity, and long stirring cycle are beneficial for lowering the macrosegregation extent, which reduces the maximum iron segregation concentration from 2.70 to 2.05 wt.% in practice. This work can provide guidance for the mass production of titanium alloy ingots with the easy-to-segregate elements.