Characterization Of Keyhole Regime For Laser Powder Bed Fusion: From Single Track Formation To Multi Layers Volume, The Change In Laser And Matter Interaction

Authors:

Maxence Guillon (1), Xavier Boulnat (2), Pauline Lambert (1), Joël Lachambre (2), Thomas Elguedj (3), Christophe Desrayaud (1)

1- Mines Saint-Étienne, Université de Lyon, LGF, France

2- INSA Lyon, Université de Lyon, MATEIS, France

3- INSA Lyon, Université de Lyon, LaMCoS, France

Abstract:

Laser Powder bed Fusion is a strong process enabling the on-demand production of components with complex geometry and high added value. Despite its strengths, there are still significant challenges to fully understanding the interaction between laser and powder. The interaction between laser and material differs significantly between single tracks and multiple tracks. In a single track, the laser only interacts with the powder. In contrast, for multiple tracks, the laser interacts also with the previously laid tracks. This underscores the inadequacy of characterizing only a single track for a comprehensive understanding of the interactions between laser and powder. Moreover, previous analyses show a focal shift that cannot be neglected on the machine used. Hence, this works aims at characterizing the melt pool during the formation of a single and multiple tracks with 316L powder material. The consequence of the focal shift is observed and measured.

DOI:

https://doi.org/10.59499/EP246281572