摘要
用扫描电镜和能谱仪研究分析了Inconel 718合金定向凝固过程中枝晶间的偏析和二次枝晶角度对合金Rayleigh数的影响。结果表明,Inconel 718合金凝固过程中的主要偏析元素是Nb和Mo,合金的Rayleigh数在液相线下10℃值最高,形成黑斑趋势最大;Inconel 718合金糊状区内,二次枝晶角度对Rayleigh数值具有显著的影响。
The effects of the segregation of interdendritic liquid and the orientation of the secondary dendrites in the mushy zone of superalloy Inconel 718 during directional solidification on Rayleigh number were investigated by SEM and EDAX techniques.It was found that the segregation elements in solidification process of Inconel 718 alloy mainly are Nb and Mo.The Rayleigh number is highest at 10 ℃ below liquidus temperature,which indicates that the trends of forming freckles is the maximum.The relative Rayleigh number is significantly affected by the orientation of the secondary dendrites.
出处
《铸造技术》
CAS
北大核心
2012年第10期1191-1193,共3页
Foundry Technology