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Saturday, January 06, 2018 8:52:54 PM
Effect of Powder Reuse Times on Additive Manufacturing of Ti-6Al-4V by Selective Electron Beam Melting
Research from 2015 that I don't remember seeing. This format was available online Dec 20, 2017. I'm not a metalurgist. I'll poke around and see if similar results have been published.
The PDF from researchgate.net - Effect of Powder Reuse Times on Additive Manufacturing of Ti-6Al-4V by Selective Electron Beam Melting
CONCLUSION
The following conclusions can be made from this study.
The oxygen content of the Ti-6Al-4V powder increased progressively from 0.08 wt.% to 0.19 wt.% with increasing powder reuse times from 0 to 21 by SEBM, while both the Al content and the V content remained generally stable (a slight decrease in the content of each element).
The powder became less spherical and the PSD became narrower with increasing reuse times. Few satellite particles were observed when the Ti-6Al-4V powder had been reused 11 times. Most particles were no longer smooth and distortion was readily visible after 16 reuses.
The flowability of the powder improved with increasing reuse times. The reasons are attributed to the absence of satellite particles and the removal of moisture due to repeated long exposures to vacuum at elevated temperatures (>550C) in the AM chamber. No powder smoke was observed in the AM process with reused Ti-6Al-4V powder.
Both the yield strength and the ultimate tensile strength increased with increasing powder reuse times from 6 to 21 due to the increased oxygen content. The tensile elongation showed no dependency on the O content over the range of 0.08 wt.% to 0.19 wt.%.
Reused powder showed no measurable undesired influence on the AM process of Ti-6Al-4V. The samples showed highly consistent tensile properties, irrespective of their locations in the powder bed.
Research from 2015 that I don't remember seeing. This format was available online Dec 20, 2017. I'm not a metalurgist. I'll poke around and see if similar results have been published.
The PDF from researchgate.net - Effect of Powder Reuse Times on Additive Manufacturing of Ti-6Al-4V by Selective Electron Beam Melting
CONCLUSION
The following conclusions can be made from this study.
The oxygen content of the Ti-6Al-4V powder increased progressively from 0.08 wt.% to 0.19 wt.% with increasing powder reuse times from 0 to 21 by SEBM, while both the Al content and the V content remained generally stable (a slight decrease in the content of each element).
The powder became less spherical and the PSD became narrower with increasing reuse times. Few satellite particles were observed when the Ti-6Al-4V powder had been reused 11 times. Most particles were no longer smooth and distortion was readily visible after 16 reuses.
The flowability of the powder improved with increasing reuse times. The reasons are attributed to the absence of satellite particles and the removal of moisture due to repeated long exposures to vacuum at elevated temperatures (>550C) in the AM chamber. No powder smoke was observed in the AM process with reused Ti-6Al-4V powder.
Both the yield strength and the ultimate tensile strength increased with increasing powder reuse times from 6 to 21 due to the increased oxygen content. The tensile elongation showed no dependency on the O content over the range of 0.08 wt.% to 0.19 wt.%.
Reused powder showed no measurable undesired influence on the AM process of Ti-6Al-4V. The samples showed highly consistent tensile properties, irrespective of their locations in the powder bed.
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