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金属学报  2015, Vol. 51 Issue (7): 844-852    DOI: 10.11900/0412.1961.2014.00692
  本期目录 | 过刊浏览 |
脉冲磁场作用下矩形截面宽厚比对K4169高温合金晶粒细化的影响*
滕跃飞,李应举,冯小辉,杨院生()
EFFECT OF RECTANGLE ASPECT RATIO ON GRAIN REFINEMENT OF SUPERALLOY K4169 UNDER PULSED MAGNETIC FIELD
Yuefei TENG,Yingju LI,Xiaohui FENG,Yuansheng YANG()
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016
全文: PDF(10824 KB)   HTML
摘要: 

研究了脉冲磁场作用下K4169高温合金矩形截面试件的凝固组织以及具有不同宽厚比矩形截面试件的晶粒细化效果, 计算模拟了脉冲磁场作用下试件熔体中电磁场和流场的分布情况, 并对细化机理进行了分析. 实验结果表明, 施加脉冲磁场后, K4169高温合金矩形试件的凝固组织得到了不同程度的细化, 当试件宽厚比为1时, 施加脉冲磁场可以使凝固组织晶粒显著细化; 随着试件宽厚比增大, 脉冲磁场的晶粒细化效果减弱. 计算模拟结果表明, 脉冲磁场在熔体中产生周期性的压-拉电磁力, 导致熔体产生周期性振荡和呈环流形式的对流. 在相同磁感应强度的脉冲磁场作用下, 试件宽厚比越接近1, 试件内的电磁力和流速越大, 有利于模壁晶核游离及枝晶臂破碎, 从而使晶粒得到细化.

关键词 高温合金晶粒细化脉冲磁场宽厚比数值模拟    
Abstract

The researches on the grain refinement by applied pulsed magnetic field (PMF) during solidification have received much attention in recent years and lots of positive experimental results indicate that it is a potential method for controlling solidification process. Various grain refinement mechanisms under PMF are proposed and most of them are considered to be relevant to the convection of melt driven by the electromagnetic force. An obvious fact is that the forced convection caused by PMF is strongly limited by the shape of the melt. However, most of previous studies were focused on the cylindrical samples rather than rectangular ones, and actually the later one was widely used in industry. The aim of this work is to investigate the influence of PMF on the grain refinement of K4169 superalloy rectangular samples with various aspect ratios. Grain refinement of K4169 superalloy under PMF was experimentally investigated in the rectangular samples with the aspect ratios of 1.0, 2.0, 4.5 and 5.5 on the transverse section. In order to study the influence of aspect ratio on the forced convection, the distributions of the electromagnetic field, electromagnetic force and melt flow caused by PMF were numerically simulated by finite element software ANSYS. The experimental results show that the grains of the K4169 rectangular samples are coarse equaxied grains without PMF and the grain size slightly decreases with the increase of aspect ratio . Under the PMF with same excitation voltage and frequency, the grains are refined remarkably in the sample with the aspect ratio of 1.0. As the aspect ratio is increased, the grain refinement effect can still be observed but not such obvious. The numerical simulation results indicate that the periodic pushing-pulling electromagnetic force is induced by the PMF, which drives the melt to vibrate and flow circularly. Under the same PMF, the electromagnetic force and fluid rate decreases with the increase of aspect ratio. When the aspect ratio increases from 1.0 to 5.5, the average electromagnetic force and fluid rate in the melt is reduced to 40% and 60%, respectively. The strongest fluid flow and vibration occur in the sample with section aspect ratio 1.0 in the present experiment, which is beneficial for grain refinement due to detachment of the solidified nuclei from mould wall and the break of dendrite arms from dendrite trunks.

Key wordssuperalloy    grain refinement    pulsed magnetic field    aspect ratio    numerical simulation
    
基金资助:* 国家自然科学基金项目 51034012和国家重点基础研究发展计划项目2010CB631205资助

引用本文:

滕跃飞,李应举,冯小辉,杨院生. 脉冲磁场作用下矩形截面宽厚比对K4169高温合金晶粒细化的影响*[J]. 金属学报, 2015, 51(7): 844-852.
Yuefei TENG, Yingju LI, Xiaohui FENG, Yuansheng YANG. EFFECT OF RECTANGLE ASPECT RATIO ON GRAIN REFINEMENT OF SUPERALLOY K4169 UNDER PULSED MAGNETIC FIELD. Acta Metall Sin, 2015, 51(7): 844-852.

链接本文:

https://www.ams.org.cn/CN/10.11900/0412.1961.2014.00692      或      https://www.ams.org.cn/CN/Y2015/V51/I7/844

图1  产生脉冲磁场的激励电流单周期波形
图2  矩形截面试件(宽厚比为5.5)的三维有限元模型及网格划分
图3  不同宽厚比的K4169高温合金矩形截面试件在有无脉冲磁场作用下的凝固组织
图4  不同宽厚比的K4169矩形截面试件在有无脉冲磁场作用下的平均晶粒尺寸
图5  激励电流峰值时刻及下降期空间磁感应强度的分布
图6  激励电流峰值时刻和激励电流下降期的感应电流密度和电磁力的分布(各小图为中心横截面上相应的分布)
Position Calculated Measured
I 0.056 0.052
II 0.051 0.048
III 0.134 0.128
表1  图5a中位置I, II和III处磁感应强度Z方向分量的计算值与实测值
图7  不同宽厚比矩形试件中的最大电磁力密度与平均电磁力密度
图8  宽厚比为1.0的试件中心轴高度75 mm处的节点流速随时间的演变规律
图9  第25 s时不同截面宽厚比下脉冲磁场在熔体中产生的流动矢量图
图10  不同宽厚比矩形试件中的最大流速与平均流速
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