Evaporation model for beam based additive manufacturing using free surface lattice Boltzmann methods
Evaporation model for beam based additive manufacturing using free surface lattice Boltzmann methods
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DOI：
10.1088/0022-3727/47/27/275303
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发表时间：
2014-07-09
影响因子：
3.4
通讯作者：
Koerner, Carolin
中科院分区：
文献类型：
--
作者：
Klassen, Alexander;Scharowsky, Thorsten;Koerner, Carolin
蒸发在许多技术应用中起着重要的作用，包括基于束的增材制造工艺，如选择性电子束或选择性激光熔化（SEBM/SLM）。在本文中，我们描述了在二维自由表面晶格玻尔兹曼方法框架内使用的蒸发模型。利用该方法，我们求解了熔融材料的流体力学和热力学，同时考虑了蒸发造成的质量和能量损失以及作用在熔池上的反冲压力。通过测量电子束熔融纯钛和Ti-6Al-4V样品的最大熔融深度和蒸发损失，对数值模型进行了验证。最后，应用该模型为SEBM过程创建处理映射。结果表明，电子束的穿透深度是加速电压的函数，对蒸发效果有显著影响。
Evaporation plays an important role in many technical applications including beam-based additive manufacturing processes, such as selective electron beam or selective laser melting (SEBM/SLM). In this paper, we describe an evaporation model which we employ within the framework of a two-dimensional free surface lattice Boltzmann method. With this method, we solve the hydrodynamics as well as thermodynamics of the molten material taking into account the mass and energy losses due to evaporation and the recoil pressure acting on the melt pool. Validation of the numerical model is performed by measuring maximum melt depths and evaporative losses in samples of pure titanium and Ti-6Al-4V molten by an electron beam. Finally, the model is applied to create processing maps for an SEBM process. The results predict that the penetration depth of the electron beam, which is a function of the acceleration voltage, has a significant influence on evaporation effects.