Simulation on Solidification Structure and Shrinkage Porosity（Hole）in TC4 Ingot during Vacuum Arc Remelting Process

Zhang Yingjuan; Kou Hongchao; Li Pengfei; Zhong Hong; Hu Rui; Li Jinshan; Zhou Lian

doi:10.15980/j.tzzz.2012.05.028

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Simulation on Solidification Structure and Shrinkage Porosity（Hole）in TC4 Ingot during Vacuum Arc Remelting Process
Vol. 32, Issue 5, Pages: 418-421(2012)
Published： 2012 ，
DOI： 10.15980/j.tzzz.2012.05.028

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[1]张颖娟,寇宏超,李鹏飞,钟宏,胡锐,李金山,周廉.真空自耗电弧熔炼TC4铸锭的凝固组织和缩松缩孔的模拟[J].特种铸造及有色合金,2012,32(05):418-421.

Zhang Yingjuan, Kou Hongchao, Li Pengfei, et al. Simulation on Solidification Structure and Shrinkage Porosity（Hole）in TC4 Ingot during Vacuum Arc Remelting Process. [J]. Special Casting & Nonferrous Alloys 32(5):418-421(2012)
[1]张颖娟,寇宏超,李鹏飞,钟宏,胡锐,李金山,周廉.真空自耗电弧熔炼TC4铸锭的凝固组织和缩松缩孔的模拟[J].特种铸造及有色合金,2012,32(05):418-421. DOI： 10.15980/j.tzzz.2012.05.028.

Zhang Yingjuan, Kou Hongchao, Li Pengfei, et al. Simulation on Solidification Structure and Shrinkage Porosity（Hole）in TC4 Ingot during Vacuum Arc Remelting Process. [J]. Special Casting & Nonferrous Alloys 32(5):418-421(2012) DOI： 10.15980/j.tzzz.2012.05.028.

摘要

建立三维轴对称有限元模型

采用移动边界法模拟了真空自耗电弧熔炼（VAR）TC4合金铸锭凝固过程的温度场分布

并基于元胞自动机和有限元耦合法（CAFE法）计算了VAR过程中TC4铸锭的凝固组织、缩松和缩孔的形成。结果表明

模拟结果与试验观察在晶粒结构、柱状晶生长方向

柱状晶-等轴晶转变及缩松和缩孔等方面相符合。

Abstract

Through establishing a three-dimensional axisymmetric finite-element model

the temperature distribution of TC4 alloy ingot during VAR（vacuum arc remelting） process was simulated by moving boundary heat transfer method.The solidification structure and shrinkage porosity（hole） formation in the TC4 alloy ingot during VAR process were visualized by the coupled method of cellular automaton（CA） and finite element（FE） method.The simulated results are well in agreement with experimental ones in grain structure

growth direction of columnar crystal

transformation of columnar grain into equiaxed grain as well as shrinkage porosity（hole）.