Effects of Power Frequency on Solidification Process Parametersof GH4169 Alloy in Electroslag Remelting Process

Liang Qiang1; Chen Xichun2; Ren Hao2; Shi Chengbin1; Guo Hanjie1

doi:10.15980/j.tzzz.2012.04.038

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Effects of Power Frequency on Solidification Process Parametersof GH4169 Alloy in Electroslag Remelting Process
Vol. 32, Issue 4, Pages: 302-306(2012)
Published： 2012 ，
DOI： 10.15980/j.tzzz.2012.04.038

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[1]梁强,陈希春,任昊,史成斌,郭汉杰.电源频率对GH4169合金电渣重熔凝固过程参数的影响[J].特种铸造及有色合金,2012,32(04):302-306.

Liang Qiang1, Chen Xichun2, Ren Hao2, et al. Effects of Power Frequency on Solidification Process Parametersof GH4169 Alloy in Electroslag Remelting Process. [J]. Special Casting & Nonferrous Alloys 32(4):302-306(2012)
[1]梁强,陈希春,任昊,史成斌,郭汉杰.电源频率对GH4169合金电渣重熔凝固过程参数的影响[J].特种铸造及有色合金,2012,32(04):302-306. DOI： 10.15980/j.tzzz.2012.04.038.

Liang Qiang1, Chen Xichun2, Ren Hao2, et al. Effects of Power Frequency on Solidification Process Parametersof GH4169 Alloy in Electroslag Remelting Process. [J]. Special Casting & Nonferrous Alloys 32(4):302-306(2012) DOI： 10.15980/j.tzzz.2012.04.038.

摘要

使用MeltFlow软件模拟了GH4169合金电渣重熔凝固过程参数的变化

分析了电源频率变化对凝固过程参数的影响。模拟结果表明

凝固过程参数随频率的增大逐渐减小

且频率小于40Hz时

变化剧烈

大于40Hz后趋于平缓;凝固过程参数沿重熔锭中心至边缘随冷却速度增大逐渐减小;局部凝固时间、二次枝晶间距、Rayleigh数变化趋势一致

在判断凝固组织优劣方面是等同的;频率增大到一定程度后

凝固组织优劣与其无关;工频条件下可以获得比低频更好的凝固组织。计算模拟结果与硫印试验结果符合

能够预测不同工艺条件下缺陷的产生及程度

能够设计和优化现有的工艺并改进铸锭质量。

Abstract

Change of solidification parameters of GH4169 alloy during electroslag remelting process was simulated by the MeltFlow software

and effects of frequency variation on the parameters were analyzed.It is shown that solidification process parameters are decreased gradually with the increase of the frequency

and it is changed sharply with frequency lower than 40 Hz

and it is changed gently with frequency more than 40 Hz.Solidification process parameters are decreased gradually with the increase of the cooling rate from center to edge of remelting ingot.Trends of local solidification time

secondary dendrite arm spacing and Rayleigh number are consistent

and these parameters are equivalent in judging solidification structure

futhermore

the solidification structure is independent of these parameters with the frequency more than 40 Hz.The solidification process parameters in the power frequency are superior to those in lower frequency.Simulation results are well agreement with experimental ones

which shows that the simulation can predict the generation and level of defects in different processes to optimize technology and improve the ingot quality.