Interaction between laser and metal powder/substrate

Schematic diagram for metal 3D printing based on DED method

Directed energy deposition (DED), also known as laser metal deposition (LMD), has been considered as a promising metal 3D printing method for fabricating relatively large metallic parts. A DED process has relatively small material waste and can minimize thermomechanical processing by fabricating near net shaped structures on demand.

Investigations on DED have mainly focused on mechanical properties of 3D printed parts to utilize 3D printed structures as an industry part. Experiments and simulations for process have been carried out to analyze process parameters on mechanical properties such as ultimate tensile strength (UTS), yield strength (YS) and elongation. Study emphasizes the thermal condition of a structure.

developed 3D printing system based on DED method Fabricated metal structure using

• Repeated thermal history
• Solidification/Phase change
• Aerosol dynamics