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首页> 外文会议>Pacific rim international conference on modeling of casting and solidification processes;MCS; 19961209-11;19961209-11; Beijing(CN);Beijing(CN) >PREDICTION OF FRECKLES DURING DIRECTIONAL SOLIDIFICATION OF NICKEL-BASE SUPERALLOY THROUGH A MACROSCOPIC MULTICOMPONENT SOLIDIFICATION MODEL
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PREDICTION OF FRECKLES DURING DIRECTIONAL SOLIDIFICATION OF NICKEL-BASE SUPERALLOY THROUGH A MACROSCOPIC MULTICOMPONENT SOLIDIFICATION MODEL

机译：通过宏观多组分凝固模型预测镍基高温合金定向凝固过程中的缺陷

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摘要

The formation of macrosegregation and freckles by multicomponent thermosolutal convection during the directional solidification of single-crystal nickel-base superalloys is numerically simulated. The model links a previously developed thermodynamic phase equilibrium subroutine with an existing code for simultaneously solving the macroscopic mass, momentum, energy, and species conservation equations for a multicomponent alloy. Simulation results are presented for a variety of casting speeds and imposed thermal gradients and two alloy compositions. It is found that for a given alloy composition the onset of convection and freckle formation occurs at a critical cooling rate, which agrees well with previous experimental findings. The predicted number and shape of the freckles in the unstable cases also agree qualitatively with experimental observations. Finally, it is demonstrated how the onset and nature of convection and macrosegregation vary with alloy composition. It is concluded that the present model can provide a valuable tool in predicting freckle defects in directional solidification of Ni-base superalloy components.
机译：数值模拟了单晶镍基高温合金定向凝固过程中多组分热固对流形成的宏观偏析和雀斑。该模型将先前开发的热力学相平衡子例程与现有代码链接，以同时求解多组分合金的宏观质量，动量，能量和物种守恒方程。给出了多种铸造速度和施加的热梯度以及两种合金成分的仿真结果。发现对于给定的合金组成，对流和形成雀斑的发生以临界冷却速率发生，这与先前的实验结果非常吻合。不稳定情况下雀斑的预测数量和形状也与实验观察在质量上一致。最后，证明了对流和宏观偏析的发生和性质如何随合金成分而变化。结论是，该模型可以为预测镍基高温合金成分定向凝固过程中的雀斑缺陷提供有价值的工具。

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