Selective Laser Beam Melting of Composite Material Systems for Fabrication of Metallic Light Weight Parts

It is the aim of this subproject to improve the fundamental understanding of the purposeful adjustment of locally variable material properties using higher and high-strength aluminium alloys as well as amorphous metals in Laser Beam Melting (LBM). Scaling laws for laser power, intensity and part dimensions are to be determined. Interrelations between residual stress of a component, heat balance in the process chamber, metallurgical microstructure, geometry and dynamics of the melt pool are investigated. In addition to pre-alloyed powders, modified and heterogeneous powder mixtures are used to create composite materials during LBM. Using those powder mixtures, the particle size distribution, form as well as composition are varied in order to examine effects on powder layer deposition, LBM-process and component properties. Temporal and spatial temperature gradients are manipulated by changing platform temperature, process atmosphere and intensity distribution using diffractive beam shaping at cw laser powers of 8000 W over wide ranges. To facilitate experiments within such boundary conditions, a self-designed LBM-machine is set up. It provides exhaustive access to all controllable parameters and excellent accessibility for measuring devices.

Professor Schmidt


Prof. Dr.-Ing. Michael Schmidt
Lehrstuhl für Photonische Technologien (LPT)
Friedrich-Alexander-Universität Erlangen-Nürnberg
Konrad-Zuse Straße 3/5
91052 Erlangen
michael.schmidt@lpt.uni-erlangen.de

Michael Rasch, M.Sc.
Lehrstuhl für Photonische Technologien (LPT)
Friedrich-Alexander-Universität Erlangen-Nürnberg
Konrad-Zuse Straße 3/5
91052 Erlangen
michael.rasch@lpt.uni-erlangen.de