Journal
WEAR
Volume 378-379, Issue -, Pages 90-95Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.wear.2017.02.030
Keywords
Ultrasonic cavitation abrasive finishing; Additive manufacturing; AM post-processing; Surface modification; Partially melted powders
Funding
- National Research Foundation (NRF) Singapore under the Corp Lab@University Scheme
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Powder Bed Fusion (PBF) is a group of powder-bed based layered Additive Manufacturing (AM) techniques for direct fabrication of metal and metal alloys. Despite its advancements, the surface quality of as-built PBF components remains unsatisfactory. In this paper, a new post-process finishing technique, based on ultrasonic cavitation effects in a solid-liquid mixture, is introduced for PBF-built components. Trials were conducted on side surfaces of Inconel 625 manufactured by Direct Metal Laser Sintering (DMLS). Results have demonstrated that this technique improves Ra values of as-built Inconel 625 side surfaces by up to 45% after 30 min of processing time. Scanning electron microscopic images revealed that most small-sized partially melted powders were removed through heterogeneous cavitation nucleation on the specimens' rough initial surface. A secondary fine-scale erosion mechanism by micro-abrasives, accelerated by cavitation bubble collapses, further depressed difficult-to-remove irregularities. (C) 2017 Elsevier B.V. All rights reserved.
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