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樊凯,吴林财,李俊杰,王锦程.钛合金VAR过程中自然对流下的宏观偏析行为模拟[J].稀有金属材料与工程(英文),2020,49(3):871~877.[Fan Kai,Wu Lincai,Li Junjie and Wang Jingcheng.Numerical simulation of macrosegregation caused by buoyancy driven flow during VAR process for titanium alloy[J].Rare Metal Materials and Engineering,2020,49(3):871~877.]
Numerical simulation of macrosegregation caused by buoyancy driven flow during VAR process for titanium alloy
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Received:January 10, 2019  Revised:July 15, 2019
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Key words: macrosegregation  vacuum arc remelting  titanium alloy  buoyancy driven flow
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Fan Kai,Wu Lincai,Li Junjie and Wang Jingcheng  
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Abstract:
      Macrosegregation is a typical defect occurred during the vacuum arc remelting (VAR) of titanium alloy ingot. In the subsequent heat treatment serious segregation of special elements would lead to the so called beta-fleck, which will significantly reduce the property of product. Reducing the incidence of macrosegregtion requires a thorough understanding of the formation mechanism of such defect. In this paper a continuum model for alloy solidification has been used to simulate the temperature evolution, solute distribution and liquid flow. The segregation patterns obtained in simulations are consistent with the observations in experiments. The development of segregation in the conditions with different thermal and solute buoyancy forces were analyzed. It was shown that the inhibition of flow can minimize the macrosegregation to the greatest extent. It was also found that the solute partition coefficient determines the segregation pattern and severity in the same fluid flow conditions.