Impact of contour scanning and helium-rich process gas on performances of Alloy 718 lattices produced by laser powder bed fusion
Artikel i vetenskaplig tidskrift, 2022

Contour scanning and process gas type are process parameters typically considered achieving second order effects compared to first order factors such as laser power and scanning speed. The present work highlights that contour scanning is crucial to ensure geometrical accuracy and thereby the high performance under uniaxial compression of complex Alloy 718 lattice structures. Studies of X-ray computed tomography visualizations of as-built and compression-strained structures reveal the continuous and smooth bending and compression of the walls, and the earlier onset of internal contact appearance in the denser lattices printed with contour. In contrast, the effect of addition of He to the Ar process gas appears to have limited influence on the mechanical response of the lattices and their microstructure as characterized by electron backscattered diffraction. However, the addition of He proved to significantly enhance the cooling rate and to reduce the amount of the generated spatters as evidenced by in situ monitoring of the process emissions, which is very promising for the process stability and powder reusability during laser powder bed fusion.

Process atmosphere

Laser powder bed fusion

Spatters

Alloy 718

Gyroid lattice

Additive manufacturing

Författare

Camille Nicole Géraldine Pauzon

Chalmers, Industri- och materialvetenskap, Material och tillverkning

T. Mishurova

Bundesanstalt für Materialforschung und -prüfung (BAM)

Marie Fischer

Chalmers, Industri- och materialvetenskap, Material och tillverkning

3D Medlab

Johan Ahlström

Chalmers, Industri- och materialvetenskap, Konstruktionsmaterial

T. Fritsch

Bundesanstalt für Materialforschung und -prüfung (BAM)

G. Bruno

Universität Potsdam

Bundesanstalt für Materialforschung und -prüfung (BAM)

Eduard Hryha

Chalmers, Industri- och materialvetenskap, Material och tillverkning

Materials and Design

0264-1275 (ISSN)

Vol. 215 110501

Ämneskategorier

Bearbetnings-, yt- och fogningsteknik

Atom- och molekylfysik och optik

Materialkemi

DOI

10.1016/j.matdes.2022.110501

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Senast uppdaterat

2022-04-01