|About this Abstract
||Materials Science & Technology 2020
||Powder Metallurgy of Light, Reactive and Other Non-ferrous Metals
||By-products from Laser-material Interactions in Laser Powder Bed Fusion of Metal Powders
||Aijun Huang, Haopeng Shen, Xinhua Wu
|On-Site Speaker (Planned)
Aiming to improve the process reliability and to facilitate the certification of LPBF, this work investigates the by-products, vapour plume and spatters found in LPBF with a focus on the crucial process parameters that have been least studied so far. The vapour-plume is found to mainly consist of nanoparticles that follow the gas flow easily. Sever laser-plume can lead to undesirable laser-plume attenuation at low gas flow, which results in large irregular lack-of-fusion defects and reduces the tensile strength. On the other hand, mechanical test results showed that spatter contamination reduces the tensile strength slightly but more significantly the fatigue properties. However, using unique LPBF scanning strategies in this work, the fatigue performance of spatter-contaminated samples can be improved significantly to the same level of samples without spatter. The knowledge obtained and methods developed in this research can be applied to facilitate the certification of LPBF productions of failure-critical components.