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Träfflista för sökning "WFRF:(Christiansson Anna Karin 1947 ) srt2:(2020-2023)"

Sökning: WFRF:(Christiansson Anna Karin 1947 ) > (2020-2023)

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1.
  • Ancona, Antonio, 1974-, et al. (författare)
  • Monitoring and control of directed energy deposition using a laser beam
  • 2023. - 1.
  • Ingår i: Additive Manufacturing of High-Performance metallic Materials. - : Elsevier. - 9780323918855 - 9780323913829 ; , s. 612-638
  • Bokkapitel (refereegranskat)abstract
    • To be a successful competitor among other technologies, metallic laser-directed energy depositionusing a laser beam would benefit from the support of intelligent automation making the processrobust, repeatable, and cost-efficient. This calls for technology leaps towards robust and accuratedetection and estimation of the conditions during processing and control schemes for robustperformance. This chapter discusses how developments in sensor technology and model-basedsignal processing can contribute to advancements in in-process monitoring of directed energydeposition using a laser beam and how developments in model-based feedforward- and feedbackcontrol can support automation. The focus is on how machine vision, optical emission spectroscopy,thermal sensing, and electrical process signals can support monitoring, control and better processunderstanding. These approaches are industrially relevant and have a high potential to support amore sustainable manufacturing. 
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2.
  • Kisielewicz, Agnieszka, et al. (författare)
  • In-process spectroscopic detection of chromium loss during Directed Energy Deposition of alloy 718
  • 2020
  • Ingår i: Materials & design. - : Elsevier BV. - 0264-1275 .- 1873-4197. ; 186
  • Tidskriftsartikel (refereegranskat)abstract
    • In this work, a fast optical spectrometer was used to monitor the Directed Energy Deposition (DED) process, during the deposition of Alloy 718 samples with different laser power, thus different energy inputs into the material. Spectroscopic measurements revealed the presence of excited Cr I atoms in the plasma plume. The presence was more apparent for the samples characterized by higher energy input. The Cr depletion from these samples was confirmed by lower Cr content detected by Energy-Dispersive X-ray Spectroscopy (EDS) analysis. The samples were also characterized by higher oxidation and high-temperature corrosion rates in comparison to the samples produced with low energy input. These results prove the applicability of an optical emission spectroscopic system for monitoring DED to identify process conditions leading to compositional changes and variation in the quality of the built material.
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