Modes of Grain Selection in Spiral Selector during Directional Solidification of Nickel-base Superalloys
Modes of Grain Selection in Spiral Selector during Directional Solidification of Nickel-base Superalloys
复制标题
镍基高温合金定向凝固过程中螺旋选晶机的晶粒选择方式
DOI：
10.1016/s1005-0302(12)60044-9
复制
发表时间：
2012-03-01
影响因子：
10.9
通讯作者：
Hu, Zhuangqi
中科院分区：
文献类型：
--
作者：
Meng, Xiangbin;Lu, Qi;Hu, Zhuangqi
通过ProCAST模拟和实验验证，研究了螺旋选粉机的选粒方式。结果表明，初始块的几何形状与晶粒分选效率有关。在晶粒选择的早期阶段，晶粒取向的优化以竞争晶粒生长为主，但在晶粒选择的后期阶段，起始块中晶粒取向的优化逐渐以几何形状为主。此外，当初始角足够大时，螺旋部分还可以优化所选单晶的取向，不同节距和初始角的螺旋部分的单晶选择受不同模式的支配。模拟结果与实验结果吻合较好。
The modes of grain selection in spiral selector were investigated by both a ProCAST simulation and experimental confirmation. The results show that the efficiency of grain selection in starter block is associated with the geometry shape. At the early stage of grain selection, the optimization of grain orientation is dominated by competitive grain growth, but the optimization of grain orientation in starter block is gradually dominated by geometry shape at the later stage of grain selection. Besides, the spiral part could also optimize the orientation of the selected single crystal when the initial angle is large enough, and the single crystal selection in spiral parts with different pitch lengths and initial angles is dominated by different modes. The simulation results agree well with experimental ones.