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首页> 外文期刊>Computational Materials Science >Study of dendrite growth with natural convection in superalloy directional solidification via a multiphase-field-lattice Boltzmann model
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Study of dendrite growth with natural convection in superalloy directional solidification via a multiphase-field-lattice Boltzmann model

机译：用多相 - 柱状螺栓玻庇型模型研究高温合金定向凝固中的枝晶生长

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摘要

The natural convection is able to change dendrite morphology and cause freckles formation in alloy solidification. Though great progress has been made in in-situ observation techniques and numerical models, the interaction between the melt flow and the growing dendrite in directionally solidified superalloy has not been well understood. In this study, the dendrite growth with natural convection in directional solidified nickel-based superalloy was investigated using a developed multiphase-field-lattice Boltzmann model. The PanNickel thermodynamic database was used to present realistic data for the multicomponent superalloy solidification simulation. A range of temperature gradients and pulling velocities were applied to investigate the effects of solidification conditions on dendrite growth and melt flow. First, the microsegregation pattern of each alloy component was obtained, and the simulation results were compared with the experimental results. Then, the dendrite morphology change and the variation of fluid velocity in the mushy zone under different solidification conditions were analyzed. The normalized average fluid velocity in the mushy zone was obtained and can be used to predict freckle formation. Finally, the effects of grain orientation on the dendrite morphology and melt convection were studied and the results were analyzed.
机译：自然对流能够改变树突形态并导致合金凝固中的雀斑形成。虽然在原位观察技术和数值模型中取得了巨大进展，但熔体流动与方向凝固的超合金中生长的树突之间的相互作用尚未得到很好的理解。在这项研究中，使用开发的多相 - 场 - 格子Boltzmann模型研究了具有定向固化镍基超合金中的自然对流的树突生长。 Pannickel热力学数据库用于呈现用于多组分超合金凝固模拟的现实数据。应用了一系列温度梯度和拉速，以研究凝固条件对树突生长和熔体流动的影响。首先，获得每种合金组分的微量测定模式，并将模拟结果与实验结果进行比较。然后，分析了不同凝固条件下糊状区中的树突形态变化和流体速度的变化。获得了糊状区的归一化平均流体速度，可用于预测雀斑形成。最后，研究了晶粒取向对树突形态和熔融对流的影响，分析了结果。

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