DZ125 superalloy 的主要树突形态学和间距在高热的坡度下面在方向性的团结期间被观察了大约 500 K/cm。结果表明到有方向性的团结冷却的增加的 35.8 m 的从 94 m 的主要树突手臂间距减少从 2.525 K/s 评价到 36.4 K/s。主要树突手臂间距的回归方程 1 对使率凉下来是 1=0.013 (GV )-0.32。Kurz/Fisher 模型和与试验性的数据相当好的 Hunt/Lu 模型一致的预言。在主要树突手臂间距上的可变热坡度下面的方向性的团结率的影响也被调查了。
The primary dendrite morphology and spacing of DZ125 superalloy have been observed during directional solidification under high thermal gradient about 500 K/cm. The results reveal that the primary dendrite arm spacing decreases from 94 μm to 35.8 μm with the increase of directional solidification cooling rate from 2.525 K/s to 36.4 K/s. The regression equation of the primary dendrite arm spacings A, versus cooling rate is λ1=0.013(GV)-0.32. The predictions of Kurz/Fisher model and Hunt/Lu model accord reasonably well with the experimental data. The influence of directional solidification rate under variable thermal gradient on the primary dendrite arm spacing has also been investigated.