立式离心场下钛合金铸件缩孔缩松数值模拟  

Modeling of Shrinkage Porosity (Hole) in Ti Alloy Castings in Vertical Centrifugal Field

作　　者：历长云[1] 崔红保[1] 吴士平[2] 郭景杰[2] 王狂飞[1] 米国发[1] 王惠玲[3] 

机构地区：[1]河南理工大学材料科学与工程学院,河南焦作454003 [2]哈尔滨工业大学材料科学与工程学院 [3]中国电子科技集团49研究所

出　　处：《特种铸造及有色合金》2008年第10期759-761,共3页Special Casting & Nonferrous Alloys

基　　金：河南理工大学博士启动基金资助项目(B2008-27)

摘　　要：立式离心场下,合金熔体的临界补缩固相率随铸型转速及旋转半径的变化而变化,研究结果显示,随着铸型转速以及旋转半径的增加,临界补缩固相率逐渐增大。通过试算法建立了立式离心场下动态临界补缩固相率。同时通过数值模拟方式,研究了铸型转速、旋转半径、熔体过热度以及铸型型温对钛合金铸件缩孔、缩松的影响。结果显示,随着铸型转速和旋转半径的增加以及熔体过热度及铸型温度的升高,铸件的缩孔、缩松逐渐减少。Critical solid fraction of (CSF) Ti alloy melt is controlled by rotating velocity of the mould and rotating radius in vertical centrifugal field. The results indicate that critical solid fraction is gradually increased with increasing in rotating velocity of mould and rotating radius. Dynamic critical solid fraction in centrifugal field was established through a trial-calculation method. Meanwhile, effects of rotating velocity, rotating radius, melt super-heating degree and temperature of mould on shrinkage hole (porosity) were predicted by the numerical simulation method. The results reveal that with increasing in rotating velocity and rotating radius as well as melt super-heating degree and mould temperature, the shrinkage porosity(hole) is reduced.

关 键 词：立式离心场 临界补缩固相率 缩孔 缩松 数值模拟 

分 类 号：TG292[金属学及工艺—铸造]