Proceedings of the
9th International Conference of Asian Society for Precision Engineering and Nanotechnology (ASPEN2022)
15 – 18 November 2022, Singapore
doi:10.3850/978-981-18-5185-8_OR-01-0041
Effect of Melt Pool and Particle Dynamics on As-built Qualities in Laser Powder Bed Fusion Process
Department of Mechanical Engineering, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi-do, Republic of Korea
ABSTRACT
Laser powder bed fusion (LPBF) is a manufacturing technique in which a laser selectively melts spread powders for building a component. The manufacturing process induces complex phenomena and an interaction between melt pools and the particles. As the complex process makes it hard to control the as-built qualities, the detailed investigation of the melt pool and particle dynamics is needed. In this work, melt pool and particle dynamics were analyzed via the in-situ monitoring and ex-situ characterization. The size and stability of Melt pools were characterized via the optical microscopic images along with a denudation zone. Additionally, spattering was observed via the in-situ thermal imaging camera for a better understanding of melt pool and particle dynamics. The complex behaviors were comprehensively explained via a thermal fluid dynamics simulation. It was found that the stability of melt pool was dominant factor to determine a density of the as-built parts, while the spatter and denudation zone significantly affected the surface quality. This work could give the fundamental understanding of microscale process in the LPBF technique so that high quality products can be produced.
Keywords: Particle dynamics, Melt pool dynamics, Microscale process design, Simulation, In-situ monitoring.
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Department of Mechanical Engineering, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi-do, Republic of Korea
ABSTRACT
Laser powder bed fusion (LPBF) is a manufacturing technique in which a laser selectively melts spread powders for building a component. The manufacturing process induces complex phenomena and an interaction between melt pools and the particles. As the complex process makes it hard to control the as-built qualities, the detailed investigation of the melt pool and particle dynamics is needed. In this work, melt pool and particle dynamics were analyzed via the in-situ monitoring and ex-situ characterization. The size and stability of Melt pools were characterized via the optical microscopic images along with a denudation zone. Additionally, spattering was observed via the in-situ thermal imaging camera for a better understanding of melt pool and particle dynamics. The complex behaviors were comprehensively explained via a thermal fluid dynamics simulation. It was found that the stability of melt pool was dominant factor to determine a density of the as-built parts, while the spatter and denudation zone significantly affected the surface quality. This work could give the fundamental understanding of microscale process in the LPBF technique so that high quality products can be produced.
Keywords: Particle dynamics, Melt pool dynamics, Microscale process design, Simulation, In-situ monitoring.
Download PDF