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3D Shape Analysis of Powder for Laser Beam Melting by Synchrotron X-ray CT

机译：Synchrotron X射线CT的激光束熔化的3D形状分析

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摘要

The quality of components made by laser beam melting (LBM) additive manufacturing is naturally influenced by the quality of the powder bed. A packing density 1 and porosity inside the powder particles lead to intrinsic voids in the powder bed. Since the packing density is determined by the particle size and shape distribution, the determination of these properties is of significant interest to assess the printing process. In this work, the size and shape distribution, the amount of the particle’s intrinsic porosity, as well as the packing density of micrometric powder used for LBM, have been investigated by means of synchrotron X-ray computed tomography (CT). Two different powder batches were investigated: Ti–6Al–4V produced by plasma atomization and stainless steel 316L produced by gas atomization. Plasma atomization particles were observed to be more spherical in terms of the mean anisotropy compared to particles produced by gas atomization. The two kinds of particles were comparable in size according to the equivalent diameter. The packing density was lower (i.e., the powder bed contained more voids in between particles) for the Ti–6Al–4V particles. The comparison of the tomographic results with laser diffraction, as another particle size measurement technique, proved to be in agreement.
机译：激光束熔化（LBM）添加剂制造的部件的质量天然受到粉末床的质量的影响。填料密度＆ 1和粉末颗粒内的孔隙率导致粉末床中的固有空隙。由于填充密度由粒度和形状分布确定，因此这些性质的测定对于评估印刷过程具有重要感兴趣。在该工作中，通过同步X射线计算机断层扫描（CT）研究了粒度和形状分布，粒子内在孔隙率的量，以及用于LBM的微米粉末的填充密度。研究了两种不同的粉末批次：通过气体雾化产生的等离子体雾化和不锈钢316L产生的Ti-6Al-4V。与通过气体雾化产生的颗粒相比，观察到等离子体雾化颗粒以比较的各向异性更球形。两种颗粒根据等同直径尺寸的尺寸相当。填料密度较低（即，粉末床在颗粒之间含有更多的空隙），用于Ti-6Al-4V颗粒。激光衍射的断层突出结果的比较，作为另一个粒度测量技术，证明是一致的。

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