About this Abstract |
Meeting |
2022 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2022)
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Symposium
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2022 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2022)
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Presentation Title |
Effects of Recoating Velocity and Layer Thickness on the Powder-bed Surface Roughness in the Laser Powder Bed Fusion (LPBF) Process |
Author(s) |
M. Hossein Sehhat, Austin T. Sutton, Zane Yates, Ming C. Leu |
On-Site Speaker (Planned) |
M. Hossein Sehhat |
Abstract Scope |
Laser Powder Bed Fusion (LPBF) process is composed of a recursive operation of spreading a powder layer followed by melting particles through laser scanning. The properties of fabricated components, such as density, tensile strength, and elongation, significantly depend on the quality of spread powder. A powder that is deemed flowable through traditional flowability tests, such as the Hausner ratio or angle of repose, may display poor spreadability in LPBF, creating defects in the fabricated components. This research investigated the effects of layer thickness and recoating velocity on the powder-bed surface roughness in the LPBF process. A high-accuracy powder spreading setup was constructed to perform the powder spreadability experiments. The powder-bed surface roughness was measured using a laser profiler. Gas-atomized 304L stainless steel powder was used in this study. The results show that by increasing the layer thickness, the surface roughness decreases while increasing the recoating velocity worsens the surface roughness. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |