Modulating Meltpool Dynamics and Microstructure using Thermoelectric Magnetohydrodynamics in Additive Manufacturing

Modulating Meltpool Dynamics and Microstructure using Thermoelectric Magnetohydrodynamics in Additive Manufacturing
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DOI：
10.1088/1757-899x/1281/1/012022
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发表时间：
2023-05
期刊：
IOP Conference Series: Materials Science and Engineering
影响因子：
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通讯作者：
A. Kao;C. Tonry;P. Soar;I. Krastiņš;X. Fan;PD Lee;K. Pericleous
A. Kao;C. Tonry;P. Soar;I. Krastiņš;X. Fan;PD Lee;K. Pericleous
中科院分区：
其他
文献类型：
--
作者：
A. Kao;C. Tonry;P. Soar;I. Krastiņš;X. Fan;PD Lee;K. Pericleous

文献摘要

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选择性激光重熔添加剂制造中的熔池调制通过振荡磁场产生热电磁流体(TEMHD)流。数值预测表明，由此产生的微观结构可以显著改变。多尺度数值模型捕捉了微观凝固过程中的细观熔池动力学，显示了微观组织的演化和溶质的再分布。结果突出了各种物理现象的复杂相互作用，也显示了该方法破坏外延生长缺陷的潜力。模型预测得到了初步实验结果的支持，这些实验结果表明熔池深度与磁场取向有关。这些结果突出了依赖时间的场如何有可能提供一种独立的控制机制来定制微结构。
Meltpool modulation in Selective Laser Remelting Additive Manufacturing via an oscillating magnetic field generates Thermoelectric Magnetohydrodynamics (TEMHD) flow. Numerical predictions show that the resulting microstructure can be significantly altered. A multi-scale numerical model captures the meso-scale melt pool dynamics coupled to microscale solidification showing the microstructure evolution and solute redistribution. The results highlight the complex interaction of the various physical phenomena and also show the method’s potential to disrupt the epitaxial growth defect. The model predictions are supported by preliminary experimental results that demonstrate the dependency of the melt pool depth on magnetic field orientation. The results highlight how a time-dependent field has the potential to provide an independent control mechanism to tailor microstructures.