期刊
MATERIALS
卷 14, 期 6, 页码 -出版社
MDPI
DOI: 10.3390/ma14061538
关键词
Inconel 718; powder recycling; powder reuse; laser powder bed fusion; selective laser melting; additive manufacturing
类别
资金
- National Centre for Research and Development in Poland [TECHMATSTRATEG1/347514/7/NCBR/2017]
This study evaluates the degradation of Inconel 718 powder due to repeated use in the Laser Powder Bed Fusion (LPBF) process. The fine particle-size distribution of the virgin powder is found to be the main factor affecting flowability, while only spatter powder is degraded to the point of being unusable for direct reuse.
In this paper, a detailed assessment of Inconel 718 powder, with varying degrees of degradation due to repeated use in the Laser Powder Bed Fusion (LPBF) process, has been undertaken. Four states of IN718 powder (virgin, used, overflow and spatter) were characterized in terms of their morphology, flowability and physico-chemical properties. Studies showed that used and overflow powders were almost identical. The fine particle-size distribution of the virgin powder, in which 50% of particles were found to be below the nominal particle-size distribution (PSD), was recognized as the main reason for its lower flowability and the main cause of the differentiation between virgin, used and overflow powders. Only spatter powder was found to be degraded enough to preclude its direct LPBF reuse. The oxygen content in the spatter powder exceeded the limit value for IN718 by 290 ppm, and aluminum oxide spots were found on the spatter particles surfaces. Laser absorption analysis showed 10 pp higher laser absorption compared to the other powders. The results of evaluation showed that IN718 powder is resistant to multiple uses in the LPBF process. Due to the low degradation rate of IN718 powder, overflow powder can be re-enabled for multiple uses with a proper recycling strategy.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据