GH3044合金宏观偏析行为及凝固过程中元素偏析规律研究  

The Investigation of Macrosegregation Behavior and Microsegregation of Alloy Elements in GH3044

作　　者：王玲[1,2] 董建新[1] 田玉亮[1] 谢锡善[1] 

机构地区：[1]北京科技大学 [2]河北科技大学,河北石家庄050054

出　　处：《稀有金属材料与工程》2006年第9期1408-1411,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50371006)资助

摘　　要：利用扫描电镜和能谱分析研究了产生黑斑的GH3044组织,采用Thermal-Calc分析方法研究了合金凝固过程中液体成分变化,并计算了合金凝固时液体密度的变化,给出了GH3044合金平衡凝固时密度反转的范围。结果表明:合金GH3044黑斑区主要是由Cr,W的碳化物相和少量高W(Cr)的体心立方相组成,合金在凝固过程中约有0.0125g·cm-3·℃-1较大的密度反转。The microstructure of GH3044 with freckles was investigated by SEM and EDAX and the variation of liquid concentration during solidification and equilibrium phase transformation was calculated by the Thermal-Calc analysis. The liquid density and the magnitude of density inversion in GH3044 during solidification were calculated. The results show that a large number of carbides and a small quantity of bcc precipitate containing rich W （or Cr） appear in freckle area. There is a high liquid density inversion of about 0.0125g ·cm^-3·℃^-1 in GH3044.

关 键 词：GH3044 黑斑 偏析 密度反转 

分 类 号：TG111.4[金属学及工艺—物理冶金]