Influence of withdrawal rate on last stage solidification path of a Mo-rich Ni3Al based single crystal superalloy
Influence of withdrawal rate on last stage solidification path of a Mo-rich Ni3Al based single crystal superalloy
复制标题
拉拔速率对富钼Ni3Al基单晶高温合金最后阶段凝固路径的影响
DOI：
10.1016/j.jallcom.2014.11.048
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发表时间：
2015-02-25
影响因子：
6.2
通讯作者：
Gong, Shengkai
中科院分区：
文献类型：
--
作者：
Ai, Cheng;Zhao, Xinbao;Gong, Shengkai
研究了富钼Ni3Al基单晶高温合金在不同拉深速率下的凝固行为。实验分析和热力学计算(JMatPro)均表明，残液中较高的Al和Mo含量促进了凝固末期γ‘相和富Mo相的析出。胞状组织中的富钼相仅为α-Mo相，而枝晶组织中存在α-Mo和γ/NiMo两种类型的富钼共晶相。凝固过程中的固相反扩散导致枝晶间析出物的体积分数随拉伸速率的增加先增大后减小。(C)2014爱思唯尔B.V.保留所有权利。
The solidification behaviors of a Mo-rich Ni3Al based single crystal superalloy at different withdrawal rates were investigated. Experimental analysis and thermodynamic calculation (by JMatPro) both indicated that the high Al and Mo contents in residual liquid promoted the precipitations of gamma' and Mo-rich phases at the last stage of solidification. Mo-rich phase in the cellular microstructure was only alpha-Mo phase, while two types of Mo-rich phase-alpha-Mo and gamma/NiMo eutectic phases existed in the dendritic microstructures. Solid back diffusion during solidification led to the volume fraction of interdendritic precipitation initially increasing and then decreasing with increasing withdrawal rate. (C) 2014 Elsevier B.V. All rights reserved.