粉末变异性对316L激光粉末床熔合加工及性能的影响

Dmitri Riabov, L. Cordova, E. Hryha, S. Bengtsson
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引用次数: 4

摘要

迄今为止,粉末的物理和化学性质对成品部件的印刷性能的影响仍然是一个知之甚少的话题。造成这种情况的一个因素是缺乏评估粉末流变特性或流动性的相关方法。本文综述了采用不同雾化技术制备的316l粉末等级。采用粉末冶金技术、粉末流变仪(FT4)和转鼓分析仪(RPA)对粉末的物理性能进行了评价。结果表明,FT4和RPA均适用于粉末表征。但是,进行评价的参数选择必须牢记应用场合,在这种情况下,薄层粉末涂布。研究发现,所有的散装粉末密度测量、基本流动能和断裂能都能够区分粉末等级,并预测粉末对基于激光的粉末床熔合工艺的适用性。尽管在较高的层厚度下,水雾化等级的印刷性能存在一些挑战,但发现两种气体雾化等级的表现相似,尽管粒径分布存在微小差异。此外,粉末的可变性对产生的机械性能没有任何不利影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of powder variability on laser powder bed fusion processing and properties of 316L
Abstract To date, the effects of powder properties, both physical and chemical, on the printed properties of as-built components is still a topic that is poorly understood. A contributing factor is the lack of relevant methods for evaluating the rheological properties of powder, or flowability. This study presents a review of different 316 L powder grades that were produced using various atomization techniques. The physical powder properties were evaluated using powder metallurgical techniques, a powder rheometer (FT4) and a rotating drum analyser (RPA). The results indicate that both the FT4 and RPA are suitable for powder characterization. However, the parameter selection for evaluation must be done keeping in mind the application, in this case thin layer powder spreading. It was found that all bulk powder density measurements, basic flow energy and the break energy were able to both differentiate between powder grades and predict how suitable the powder will be for the laser-based powder-bed fusion process. Despite some printability challenges of the water atomized grades at higher layer thicknesses, it was found that both gas atomized grades performed similarly despite minor differences in particle size distribution. Furthermore, powder variability did not show any detrimental effects on the resulting mechanical properties.
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