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dc.contributor.authorTan, Kheng Leongen_US
dc.contributor.authorYeo, Sweehocken_US
dc.identifier.citationTan, K. L. & Yeo, S. (2020). Surface finishing on IN625 additively manufactured surfaces by combined ultrasonic cavitation and abrasion. Additive Manufacturing, 31, 100938-.
dc.description.abstractThe poor and non-uniform surface quality of parts produced by powder bed fusion (PBF) processes remains a huge limitation in additive manufacturing. Here we show that ultrasonic cavitation abrasive finishing (UCAF) could improve the surface integrity of PBF surfaces built at various orientations –0°, 45° and 90°. Average surface roughness, Ra, was reduced from as high as 6.5 μm on side surfaces (90°) to 3.8 μm. Surface morphological observations showed extensive removals of surface irregularities and peak reduction on sloping (45°) and side surfaces. The micro-hardness of the first 100 μm of the surface layer was enhanced up to 15 % post-UCAF. Dimensional changes were minimal and uniquely dependent on the initial surface characteristics. A parametric study further showed the effect of abrasive size, abrasive concentration, ultrasonic amplitude and working gap on UCAF's performance. A moderate abrasive size at 12.5 μm and concentration level at 5 wt% resulted in the lowest final Ra; as the two dominant material removal mechanisms – direct cavitation erosion and micro-abrasive impacts – were balanced. Finally, UCAF was demonstrated to result in 20 % Ra improvement of internal surfaces of a 3 mm diameter channel.en_US
dc.description.sponsorshipNational Research Foundation (NRF)en_US
dc.relation.ispartofAdditive Manufacturingen_US
dc.rights© 2019 Elsevier B.V. All rights reserved.en_US
dc.subjectEngineering::Mechanical engineeringen_US
dc.titleSurface finishing on IN625 additively manufactured surfaces by combined ultrasonic cavitation and abrasionen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Mechanical and Aerospace Engineeringen_US
dc.subject.keywordsUltrasonic Cavitationen_US
dc.subject.keywordsAbrasive Finishingen_US
dc.description.acknowledgementThis work was conducted within the Rolls-Royce@NTU Corporate Lab with support from the National Research Foundation (NRF) Singapore under the Corp Lab@University Scheme. The author is grateful to Ms Tan Yee Chin, who has shown rigorous tenacity and enthusiasm in gathering the data presented in this paper. This gratitude is also extended to Mr Choong Yue Hao from the Advanced Remanufacturing and Technology Center (ARTC), Singapore, for his assistance in the DMLS specimen building.en_US
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