Evolution
of Macrosegregation During Three-Stage Vacuum Arc Remelting of Titanium Alloys

doi:10.11900/0412.1961.2022.00544

Acta Metall Sin DOI: 10.11900/0412.1961.2022.00544

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Evolution of Macrosegregation During Three-Stage Vacuum Arc Remelting of Titanium Alloys

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Abstract Macrosegregation is a typical solidification defect formed during vacuum arc remelting (VAR) process. This defect adversely affects the property of ingots as the defect sustains even in the subsequent heat treatment process. In the industrial production of titanium alloys, VAR is repeated thrice to eliminate inclusions and improve the homogenization of composition. However, the evolution of macrosegregation during the different stages of the triple VAR process remains unclear. In this study, the melt flow behavior and macrosegregation of titanium ingots in the multistage VAR process are examined via solidification simulations, considering both buoyancy and electromagnetic force. The results show that the strong fluid flow in the upper part of melting pooling eliminates nonuniform concentration along the radial direction of the electrode. In contrast, the nonuniform concentration along the axial direction can be inherited in the sequential ingot, which results in more macrosegregation. However, with the increase in the depth of melt pool, the sustained melt flow from the bottom to upside can reduce the axial macrosegregation delivery. In addition, the use of the previous ingot directly as the electrode for the subsequent remelting process results in severe macrosegregation. However, turning the previous ingot upside–down at least once during the three-stage VAR process can substantially reduce the macrosegregation. Overall, the simulated macrosegregation results agree with the experimental results.

Key words: macrosegregation solidification vacuum arc remelting titanium alloy numerical simulation.

Received: 25 October 2022

ZTFLH:

TG146.23

Fund: the research fund of State Key Laboratory of Solidification Processing in NWPU

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Cite this article:

. Evolution of Macrosegregation During Three-Stage Vacuum Arc Remelting of Titanium Alloys. Acta Metall Sin, 0, (): 0-0.

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https://www.ams.org.cn/EN/10.11900/0412.1961.2022.00544 OR https://www.ams.org.cn/EN/Y0/V/I/0

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