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Controlling interdependent meso-nanosecond dynamics and defect generation in metal 3D printing.
Saad A Khairallah1, Aiden A Martin2, Jonathan R I Lee2
1Lawrence Livermore National Laboratory, Livermore, CA 94550, USA. khairallah1@llnl.gov.
Science (New York, N.Y.)
|May 9, 2020
Summary
Controlling laser-powder-melt pool dynamics in metal 3D printing is key to reliability. New insights into spatter defects and stabilization criteria improve build quality.
Area of Science:
- Materials Science
- Manufacturing Engineering
- Physics
Background:
- Metal 3D printing offers manufacturing advancements but lacks operational reliability.
- Controlling complex laser-powder-melt pool dynamics is a significant challenge.
Purpose of the Study:
- To investigate the intricate dynamics of laser-powder-melt pool interactions.
- To identify mechanisms behind spatter-induced defects in metal additive manufacturing.
- To develop criteria for enhancing melt pool stability and reducing defects.
Main Methods:
- Utilized high-fidelity simulations to model complex physical phenomena.
- Employed synchrotron experiments for meso-nanosecond scale transient dynamics capture.
- Analyzed the influence of scan strategy on defect formation.
Main Results:
- Discovered novel spatter-induced defect formation mechanisms.
- Identified a competition between laser shadowing and expulsion influencing defects.
- Captured fast, multi-transient dynamics at the meso-nanosecond scale.
Conclusions:
- Derived criteria to stabilize melt pool dynamics, crucial for reliable metal 3D printing.
- Findings pave the way for improved defect minimization and enhanced build reliability.
- Understanding these dynamics is essential for advancing additive manufacturing processes.
