| About this Abstract |
| Meeting |
Materials Science & Technology 2020
|
| Symposium
|
Additive Manufacturing: Equipment, Instrumentation and Measurement
|
| Presentation Title |
Adaptive Multi-Beam Laser Additive Manufacturing (AMB-LAM) Technology: Instrumentation and Processes Development and Demonstration |
| Author(s) |
Mikhail Vorontsov, Nathan Farwell, Michael Massey, Geunsik Lim |
| On-Site Speaker (Planned) |
Mikhail Vorontsov |
| Abstract Scope |
We describe an innovative powder bed selective laser melting (SLM) system based on a fiber array laser energy source composed of seven laser beams whose parameters (power, focal spot centroid coordinates, scanning speed, amplitude and direction) can be simultaneously and individually controlled to adaptively shape spatio-temporal distribution of the laser power on the powder material providing capabilities for thermal gradients management during the SLM processes. The developed adaptive 7-beam powder bed SLM system was utilized for printing basic coupons using different beam shapes from the following materials: Inconel 718, 7075Al, Ti-6Al-4V, 316L stainless steel and Ti-48Al-2Cr-2Nb. The coupon characterization demonstrated potentials for improvements in surface finish, density, tensile and yield strength, ductility and micro-cracks mitigation. Microstructures of the test coupons were evaluated with EBSD imaging techniques. The obtained EBSD images clearly demonstrated ability for local modification (transitioning from columnar to equiaxed) of material micro-structures during the SLM process. |