Predictive Simulation of Process Windows for Powder Bed Fusion Additive Manufacturing: Influence of the Powder Bulk Density.
Predictive Simulation of Process Windows for Powder Bed Fusion Additive Manufacturing: Influence of the Powder Bulk Density.
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DOI：
10.3390/ma10101117
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发表时间：
2017-09-22
期刊：
影响因子：
--
通讯作者：
Körner C
中科院分区：
文献类型：
--
作者：
Rausch AM;Küng VE;Pobel C;Markl M;Körner C
粉末床熔融增材制造工艺制造的零件的最终性能是由它们的孔隙度、局部成分和微观结构决定的。本文的目的是通过数值模拟的方法来研究随机粉末床对致密零件工艺窗口的影响。这些研究证明了用介观方法模拟毫米范围内宏观区域的独特能力，从而解决了粉末床和熔池的流体动力学问题。模拟过程窗口揭示了随机粉末层的影响。用选择性电子束熔化Ti-6Al-4V的实验过程窗口对数值结果进行了验证。此外，还对粉末堆积密度的影响进行了数值分析。模拟预测了较低粉末堆积密度的样品的孔隙率和表面粗糙度的增加。由于其不利的粉末排列的可能性较高，过程的稳定性也降低。这缩小了生产致密零件的工艺窗口中的实际参数范围。
The resulting properties of parts fabricated by powder bed fusion additive manufacturing processes are determined by their porosity, local composition, and microstructure. The objective of this work is to examine the influence of the stochastic powder bed on the process window for dense parts by means of numerical simulation. The investigations demonstrate the unique capability of simulating macroscopic domains in the range of millimeters with a mesoscopic approach, which resolves the powder bed and the hydrodynamics of the melt pool. A simulated process window reveals the influence of the stochastic powder layer. The numerical results are verified with an experimental process window for selective electron beam-melted Ti-6Al-4V. Furthermore, the influence of the powder bulk density is investigated numerically. The simulations predict an increase in porosity and surface roughness for samples produced with lower powder bulk densities. Due to its higher probability for unfavorable powder arrangements, the process stability is also decreased. This shrinks the actual parameter range in a process window for producing dense parts.
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DOI：
10.1243/095440505x8109
发表时间：
2005-04-01
影响因子：
2.6
作者：
Childs, THC;Hauser, C;Badrossamay, M
通讯作者：
Badrossamay, M
DOI：
10.1007/bf02647329
发表时间：
1992-05-01
期刊：
METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
影响因子：
--
作者：
GERMAN, RM
通讯作者：
GERMAN, RM
影响因子：
3.4
作者：
Klassen, Alexander;Scharowsky, Thorsten;Koerner, Carolin
通讯作者：
Koerner, Carolin
影响因子：
3.4
作者：
Klassen, Alexander;Bauereiss, Andreas;Koerner, Carolin
通讯作者：
Koerner, Carolin
影响因子：
1.6
作者：
Körner, C;Thies, M;Rüde, U
通讯作者：
Rüde, U