About this Abstract |
Meeting |
2024 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2024)
|
Symposium
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2024 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2024)
|
Presentation Title |
Study of Using a Secondary Pulsed Laser for Process Control in Laser Powder Bed Fusion |
Author(s) |
Dongping Terrel-Perez, CE Kim, Gabe Guss, Thejaswi Tumkur Umanath |
On-Site Speaker (Planned) |
Dongping Terrel-Perez |
Abstract Scope |
Laser processing enables metal printing with 3D intricate geometries and high throughput. In laser powder bed fusion (L-PBF), high laser intensities and scan speeds lead to high solidification growth rates and induce large thermal gradients in and near the melt pool, leading to coarse, textured microstructure. Heat and mass transport mechanisms are strongly dictated by melt-pool behaviors. Here, we implement an ultrashort pulsed laser as a secondary beam, in combination with a primary cw laser beam. We track the chevron patterns formed on a laser weld track (in SS316L) upon solidification, and correlate extracted cooling rates to the surface roughness of printed tracks. We observe that unique optical properties of such dual-beam, temporal modulation approach results in control over cooling rates, surface quality and microstructure. The unique combination of cw and ultrashort pulsed lasers will provide additional degrees of freedom for improving microstructural and mechanical properties in L-PBF. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |