About this Abstract |
Meeting |
2025 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2025)
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Symposium
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2025 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2025)
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Presentation Title |
Pore Behavior in Melt Pool Properties Based on Ti-6Al-4V and SS316L Powders in Directed Energy Deposition (DED) Processes |
Author(s) |
Donghee Kang, Samanta Webster, Sampson Canacoo, Samuel J. Clark, Jihoon Jeong |
On-Site Speaker (Planned) |
Donghee Kang |
Abstract Scope |
Laser powder-directed energy deposition (DED) is a type of metal additive manufacturing that uses metal powder and a laser source. Pore generation is inevitable during the DED process and originates from various factors, such as powder particle delivery to the melt pool in an inert gas environment and intrinsic gas trapped in the particles. We describe pore behavior via in-situ X-ray synchrotron imaging to observe pore movement using two materials: Ti-6Al-4V and stainless steel 316L. These powders differ in thermo-fluidic characteristics as surface tension gradients vary with temperature. The surface tension gradient determines the pore flow direction along the gradients. Pore size and its persistence within the melt pool depend on the surface tension gradient and other physical properties such as density, thermal conductivity, and dynamic viscosity. Understanding the thermo-fluidic characteristics of the melt pool is essential for developing effective pore-reduction strategies during the DED process. |
Proceedings Inclusion? |
Planned: Post-meeting proceedings |