脉冲电变质处理纯Al凝固晶粒组织形成计算机可视化模拟  

Computer Visual Simulation for Solidified Grain Structures of Al Under Pulse Electric Discharging Modification

作　　者：马连辉[1] 赵志龙[1] 刘华泽[1] 王保建[1] 

机构地区：[1]西北工业大学机电学院,陕西西安710072

出　　处：《铸造》2008年第10期1025-1028,共4页Foundry

基　　金：陕西省自然科学基金(2006E143)资助项目

摘　　要：研究了电变质处理形成的纯Al凝固晶粒组织。试验过程中对不同电脉冲冲击能量下的过冷度数值进行实测,在此基础上利用连续形核模型和枝晶尖端生长的动力学模型即KGT模型模拟了纯Al凝固晶粒组织的形成过程。计算了该组织的凝固晶粒组织特征值,包括晶粒密度和平均晶粒尺寸,并与实测数据进行了对比。试验结果显示电脉冲冲击能量从0 J增加到270J时,过冷度随脉冲能量的增加而从6℃增大到14.1℃,最大形核密度从1.99×104个/m2增大到1.991 87×108个/m2,最大晶粒形核密度提高四个数量级。经过对比模拟结果与试验结果符合较好。The solidification grain structure of pure Al under pulse electric discharging modification is studied. Through measuring the undercooling value under different electric pulse impact energy in the experiment, the solidified grain structure formation of AI is simulated by means of continuous nucleation model and kinetic model of dendrite tip growth （KGT model）. The characteristic parameters of solidified grain structures of AI, including grain density and average grain size, are calculated and compared with actual grain structure eigenvalue. The results show that the undercooling enhances from 6 ℃ to 14.1 ℃with the increase of pulse energy and the biggest nucleation density enhances from 1.99×10^4 per m2 to 1.991 87×10^8 per m2 when the electric pulse impact energy increases from 0 J to 270 J. The biggest nucleation density enhances four magnitudes. The simulated results agree well with the experimental results.

关 键 词：电变质处理 过冷度 计算机可视化模拟 形核 冲击能量 

分 类 号：TG244.3-39[金属学及工艺—铸造]