冷却速度对Waspaloy合金凝固过程中偏析和液体密度的影响  

Effect of cooling rate on the segregation and liquid density of Waspaloy alloy during solidification process

作　　者：仲博颖[1] 王玲[1] 张麦仓[1] 董建新[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083

出　　处：《北京科技大学学报》2008年第7期760-764,共5页Journal of University of Science and Technology Beijing

基　　金：国家自然科学基金资助项目(No.50371006)

摘　　要：通过不同冷速下的重熔凝固实验,利用扫描电镜和能谱仪系统研究了冷速变化对Waspaloy合金凝固过程偏析行为和液体密度的影响.结果表明:随着冷速的增大,Waspaloy合金中元素的偏析会减小,凝固过程中偏析最严重的是富集于枝晶间的正偏析元素Ti;元素偏析导致剩余液体的密度发生变化,而且液体密度基本上呈现反转趋势,当凝固温度到1300℃时,出现最大的密度反转.Remelting tests at different cooling rates for Waspaloy alloy were performed and the effect of cooling rate on the segregation behavior and the liquid density of Waspaloy alloy during solidification process was systematically investigated by SEM and EDAX. The results show that the element segregation decreases with increasing cooling rate and Ti segregation is the most serious during solidification which is a positive segregation element and congregates in interdendritic area. The liquid density exhibits an in-version trend due to the element segregation. The maximum liquid density inversion occurs near the solidification temperature of 1 300℃.

关 键 词：Waspaloy合金 凝固组织 冷速 凝固偏析 液体密度 

分 类 号：TG132.3[一般工业技术—材料科学与工程]