A multi-component evaporation model for beam melting processes
A multi-component evaporation model for beam melting processes
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DOI：
10.1088/1361-651x/aa5289
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发表时间：
2017-03-01
影响因子：
1.8
通讯作者：
Koerner, Carolin
中科院分区：
文献类型：
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作者：
Klassen, Alexander;Forster, Vera E.;Koerner, Carolin
在使用激光或电子束熔化技术的增材制造中，当加工具有挥发性元素的合金时，蒸发损失和化学成分的变化是已知的问题。在本文中，最近描述的数值模型的基础上，一个二维自由表面格子玻尔兹曼方法进一步发展，将多组分蒸发的影响。该模型考虑了金属粉末加热熔化过程中局部熔池成分的影响。为了验证，钛合金Ti-6Al-4V通过选择性电子束熔化进行熔化，并使用质量损失测量和高分辨率微探针成像进行分析。数值确定的蒸发损失和铝的空间分布比较以及与实验数据。在散装样品中的熔池形成的预测提供洞察挥发性合金元素的损失之间的竞争，从辐照表面和它们的平流再分布在熔融区域内。
In additive manufacturing using laser or electron beam melting technologies, evaporation losses and changes in chemical composition are known issues when processing alloys with volatile elements. In this paper, a recently described numerical model based on a two-dimensional free surface lattice Boltzmann method is further developed to incorporate the effects of multicomponent evaporation. The model takes into account the local melt pool composition during heating and fusion of metal powder. For validation, the titanium alloy Ti-6Al-4V is melted by selective electron beam melting and analysed using mass loss measurements and high-resolution microprobe imaging. Numerically determined evaporation losses and spatial distributions of aluminium compare well with experimental data. Predictions of the melt pool formation in bulk samples provide insight into the competition between the loss of volatile alloying elements from the irradiated surface and their advective redistribution within the molten region.