Influence of part geometry on spatter formation in laser powder bed fusion of Inconel 718 alloy revealed by optical tomography

Chen, Zhuoer; Raza, Ahmad; Hryha, Eduard

doi:10.1016/j.jmapro.2022.07.031

Cited by 11 publications

(1 citation statement)

References 37 publications

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“…The extent to which these spatters redeposit on the powder bed and can overlap on the processing area of other components was also put in evidence using the Exposure OT monitoring of this machine for IN718® alloy and cellular structures [17]. Another predominant factor to powder degradation during LPBF lifted by Chen et al [18], also thanks to OT monitoring, is the components design and in particular the surface-to-volume ratio as well as its orientation in the build space and the presence of large overhanging areas.…”

Section: Resultsmentioning

confidence: 99%

Effect of layer thickness on spatter properties during laser powder bed fusion of Ti–6Al–4V

et al. 2023

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High layer thicknesses for laser powder bed fusion are promising for productivity increase. However, these are associated with increased process instability, spatter generation and powder degradation, crucial for alloys sensitive to oxygen. The effect of increasing layer thickness from 30 to 60 µm is studied focusing on Ti-6Al-4V spatter formation during LPBF and its characterisation, with scanning and transmission electron microscopy, combustion analysis and X-ray photoelectron spectroscopy. Results indicate that spatters are covered with a uniform Ti-Al-based oxide layer and Al-rich oxide particulates, the thickness of which is about twice that present on virgin powder. The oxygen content was about 60% higher in spatters compared to the virgin powder. The study highlights that increasing the layer thickness to 60 µm permits to reduce the total generation of spatters by ∼40%, while maintaining similar spatter characteristics and static tensile properties. Hence, this allows to increase build rate without compromising process robustness.

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Section: Resultsmentioning

confidence: 99%