抽拉速率对含Ru镍基单晶高温合金凝固组织的影响

Effects of Withdrawal Rate on Solidification Microstructure of Single Crystal Ni-based Superalloy Containing Ruthenium

摘要:

研究了不同抽拉速率对含Ru镍基单晶高温合金凝固组织的影响。结果表明，随着抽拉速率的加快，单晶合金的铸态组织由粗枝状晶向细枝状晶演变，枝晶干和枝晶间的g ￠相尺寸减少，合金元素的偏析降低，g-g ￠共晶含量减少，NiAl基b相含量逐渐降低。同时，抽拉速率对合金的相变温度影响不大。

Abstract:

The effect of withdrawal rates on the solidification microstructure of a single crystal Ni-based superalloy containing ruthenium was investigated. The results show that with the increase of the withdrawal rate, the as-cast microstructure of the single crystal alloy transforms from coarse dendrite to fine dendrite. Meanwhile, the size of the g ￠ particles decreases, segregation of alloying elements for the dendrite and interdendritic regions tends to be reduced, the volume fraction of g-g ￠ eutectic and NiAl-based b phase decreases gradually. In addition, the withdrawal rate has little influence on the phase transformation temperature of the superalloy.