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SMOB - Research project
In situ radioscopy of the melt pool morphology for selective beam melting
PhD student: Maxence GUILLON, ED 488 SIS (Science, Engineering, Health)
ABSTRACT
Additive manufacturing laser fusion processes, are based on the interaction with the powder and the surface of the molten bath of a beam allowing the creation of a unitary bead whose quality and integrity are linked to the parameters (laser motion and, power, focussing, etc.) of the production devices. The technology concerned is Laser beam melting, the adjustment of the parameters of which can give rise to the generation of the “Keyhole” regime known from the welders community. This construction regime promoting the homogeneous distribution of the heat input can sometimes lead to the creation of macroscopic porosity type defects causing the weakening of the components thus produced. The mechanisms which lead to these defects are intrinsically linked to the laser-material interaction leading to the fusion of the powder and the substrate then to the evolution of the behavior of the liquid surface subjected to the tensions and pressure of the liquid in interaction with the external atmosphere. In this thesis, we study the formation of “keyhole” type defects by analysis of samples manufactured by the SLM process, on a well-controlled grade such as 316L stainless steel.
PUBLICATIONS
- M. Guillon, X. Boulnat, P. Lambert, J. Lachambre, T. Elguedj, C. Desrayaud, "Characterization of keyhole regime for Laser Powder Bed Fusion: from single track formation to multi layers volume, the change in laser and matter interaction", conference article EUROPM, DOI:10.59499/EP246281572
About the SMOB project
RESEARCH AXIS
Axis #1
KEYWORDS
Additive manufacturing, Laser beam melting,
edification regimes, Keyhole mode, AThmosphere interaction
DURATION - STATUS
01/10/2021 – 30/09/2024 - Completed
PhD STUDENT
Maxence GUILLON (LGF)
PROJECT COORDINATOR
Christophe DESRAYAUD (LGF)
COORDINATING LABORATORY
Georges Friedel Laboratory (LGF)
PARTNER LABORATORIES - OTHER PARTNERS
MATEIS
LTDS
LaMCoS
Laboratory of Vibration and Accoustics (LVA)
EquipEx Manutech-USD
PARTNER RESEARCHERS
Thomas EL GUEDJ (LaMCoS)
Julien FAVRE (LGF)
Nicolas TARDIF (LaMCoS)
Xavier BOULNAT (MATEIS)
Joel LACHAMBRE (MATEIS)
Philippe BERTRAND (LTDS)
Jean Michel BERGHEAU (LTDS)
Axis #1
KEYWORDS
Additive manufacturing, Laser beam melting,
edification regimes, Keyhole mode, AThmosphere interaction
DURATION - STATUS
01/10/2021 – 30/09/2024 - Completed
PhD STUDENT
Maxence GUILLON (LGF)
PROJECT COORDINATOR
Christophe DESRAYAUD (LGF)
COORDINATING LABORATORY
Georges Friedel Laboratory (LGF)
PARTNER LABORATORIES - OTHER PARTNERS
MATEIS
LTDS
LaMCoS
Laboratory of Vibration and Accoustics (LVA)
EquipEx Manutech-USD
PARTNER RESEARCHERS
Thomas EL GUEDJ (LaMCoS)
Julien FAVRE (LGF)
Nicolas TARDIF (LaMCoS)
Xavier BOULNAT (MATEIS)
Joel LACHAMBRE (MATEIS)
Philippe BERTRAND (LTDS)
Jean Michel BERGHEAU (LTDS)