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采用有限元方法模拟了DZ417G镍基高温合金定向凝固过程中的温度场、流场和界面形状的变化,考察了凝固阶段坩埚的拉速和炉子的温度梯度对流场和界面形状的影响.结果表明,随着拉速从6mm/min增加到24mm/min,凝固界面上方产生的中心向上流动的旋涡强度增加,界面的差值f从1.5mm增大到7.2mm,曲率显著增加;当拉速为6mm/min时,随着温差增加到1000℃后,凝固界面上方未产生新的旋涡,凝固界面可始终保持平界面.
The finite element method was used to simulate the changes of temperature field, flow field and interface shape during the directional solidification of DZ417G nickel base superalloy, and the influence of the pulling speed of the crucible and the temperature gradient of the furnace on the flow field and interface shape were investigated. The results show that as the pulling speed increases from 6mm / min to 24mm / min, the vortex intensity increases from the center to the top of the solidified interface, and the difference f increases from 1.5mm to 7.2mm, and the curvature increases significantly. 6mm / min, with the temperature difference increased to 1000 ℃, there is no new vortex above the solidified interface, the solidified interface can always maintain a flat interface.