About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing, Directed Energy Deposition of Metals: Processing – Microstructure – Mechanical Property Relationships
|
| Presentation Title |
Shaped Laser Texture Modulation in the Directed Energy Deposition of a Nickel Superalloy |
| Author(s) |
Jack Dale, Annabel Shim, James Zuback, Carelyn Campbell, Samantha Webster |
| On-Site Speaker (Planned) |
Jack Dale |
| Abstract Scope |
Tunable zoned laser systems are a novel development in additive manufacturing (AM), reducing both industrial need for multiple laser systems and changeover time. These systems are shown to afford greater microstructural control in laser powder bed fusion (L-PBF) by altering local thermal gradients in the melt pool. While not yet evidenced in laser powder blown directed energy deposition (DED-LB), this suggests similar control is possible. Here an nLight AFX-1200 fiber laser system was used to modulate the energy distribution between nested annular and Gaussian profiles. Single tracks of Inconel 625 were deposited using six different power distributions, transitioning between those profiles. Changing the power distribution transitioned the fibrous texture towards finer and lower aspect ratio grains. This demonstration of concept shows that control is possible, opening the door for future work to elucidate mechanisms as they apply to DED-LB and to exert control over mechanical properties of deposited parts. |