Residual oxygen content and powder recycling: Effects on surface roughness and porosity of additively manufactured Ti-6Al-4V

Research output: Contribution to journalArticleResearchpeer review

Authors

  • Nicole Emminghaus
  • Christian Hoff
  • Jörg Hermsdorf
  • Stefan Kaierle

External Research Organisations

  • Laser Zentrum Hannover e.V. (LZH)
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Details

Original languageEnglish
Article number102093
JournalAdditive Manufacturing
Volume46
Early online date3 Jun 2021
Publication statusPublished - Oct 2021
Externally publishedYes

Abstract

The PBF-LB/M (laser-based powder bed fusion of metals) process is associated with high as-built surface roughness and surface texturing caused by a variety of process inherent effects. It is well known that surface roughness is influenced by the applied processing parameters and correlates with porosity. In terms of reactive materials like Ti-6Al-4V, also the powder recycling grade and especially the residual oxygen content within the processing atmosphere play important roles regarding process stability, reproducibility and part properties. Therefore, this study investigated the influence of the residual oxygen content on porosity and surface roughness for virgin as well as recycled powder by employing DoE techniques. Within the examined range, unlike for the roughness, no significant influence of residual oxygen content and powder constitution on porosity could be detected. It could be shown that the reproducibility of relative density mainly depends on the processing parameter combination. Furthermore, powder recycling led to higher top and side surface roughness and a dependence of surface texture on processing parameters could be demonstrated.

Keywords

    Additive manufacturing, Laser-based powder bed fusion of metals, Porosity, Surface roughness, Ti-6Al-4V

ASJC Scopus subject areas

Cite this

Residual oxygen content and powder recycling: Effects on surface roughness and porosity of additively manufactured Ti-6Al-4V. / Emminghaus, Nicole; Hoff, Christian; Hermsdorf, Jörg et al.
In: Additive Manufacturing, Vol. 46, 102093, 10.2021.

Research output: Contribution to journalArticleResearchpeer review

Emminghaus N, Hoff C, Hermsdorf J, Kaierle S. Residual oxygen content and powder recycling: Effects on surface roughness and porosity of additively manufactured Ti-6Al-4V. Additive Manufacturing. 2021 Oct;46:102093. Epub 2021 Jun 3. doi: 10.1016/j.addma.2021.102093
Emminghaus, Nicole ; Hoff, Christian ; Hermsdorf, Jörg et al. / Residual oxygen content and powder recycling : Effects on surface roughness and porosity of additively manufactured Ti-6Al-4V. In: Additive Manufacturing. 2021 ; Vol. 46.
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abstract = "The PBF-LB/M (laser-based powder bed fusion of metals) process is associated with high as-built surface roughness and surface texturing caused by a variety of process inherent effects. It is well known that surface roughness is influenced by the applied processing parameters and correlates with porosity. In terms of reactive materials like Ti-6Al-4V, also the powder recycling grade and especially the residual oxygen content within the processing atmosphere play important roles regarding process stability, reproducibility and part properties. Therefore, this study investigated the influence of the residual oxygen content on porosity and surface roughness for virgin as well as recycled powder by employing DoE techniques. Within the examined range, unlike for the roughness, no significant influence of residual oxygen content and powder constitution on porosity could be detected. It could be shown that the reproducibility of relative density mainly depends on the processing parameter combination. Furthermore, powder recycling led to higher top and side surface roughness and a dependence of surface texture on processing parameters could be demonstrated.",
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AU - Hoff, Christian

AU - Hermsdorf, Jörg

AU - Kaierle, Stefan

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