| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing: Equipment, Instrumentation and In-Situ Process Monitoring
|
| Presentation Title |
Mechanistic Investigation of Powder Catchment Efficiency Through In-situ Monitoring in Laser Directed Energy Deposition |
| Author(s) |
Colin Ancalmo, Sneha Prabha Narra |
| On-Site Speaker (Planned) |
Colin Ancalmo |
| Abstract Scope |
Powder blown laser directed energy deposition is a key manufacturing process for near-net shape metal part production and part repair. However, build planning remains a challenge for new systems and feedstocks due to the empirical nature of powder catchment and deposition layer height. The interconnected relationship of catchment efficiency with melt pool width, powder diameter, and carrier gas flow rate lacks mechanistic explanation. This work applies high-speed in-situ imaging of powder deposition to map deposition parameters to known geometric catchment efficiency models. We then correlate particle Stokes number to particle stream diameter to predict catchment efficiency without in-situ imaging and achieve similar accuracy to geometric models. The mechanistic influence of powder diameter and carrier gas flow rate on catchment reveals limitations of purely geometric models. This understanding can be applied by end users to estimate catchment efficiency and accelerate build planning under new powder deposition parameters. |