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Electropolishing of laser powder bed-fused IN625 components in an ionic electrolyte

Neda Mohammadian, Sylvain Turenne, Vladimir Brailovski

Article (2019)

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Abstract

This work presents the first practical application of ionic electrolytes for electropolishingof nickel-based superalloys. It contains the results of an experiment-driven optimization of theapplied potential and electrolyte temperature during electropolishing of laser powder bed-fusedIN625 components containing surfaces oriented to the building platform under angles varying from 0to 135°. For comparative purposes, the roughness profilometry and confocal microscopy techniqueswere used to characterize the surface finish topographies and the material removal rates of IN625components subjected to electropolishing in ionic and acidic (reference) electrolytes. After 4 h ofelectropolishing in both electrolytes, a roughness of Ra ≤ 6.3 μm (ISO N9 grade number of roughness)was obtained for all the build orientations. To elaborate, both electrolytes manifested identicalroughness evolutions with time on the 45° (75% Ra reduction) and 90°-oriented (65% Ra reduction)surfaces. Although the roughness reduction on the 135°-oriented surface in the ionic electrolyte was17% less than in the acidic electrolyte, the former provided a more uniform roughness profile on the0°-oriented surface (30% Ra reduction) and 44% higher current efficiency than the acidic electrolyte.This work proves that ionic electrolytes constitute a greener alternative to industrial acidic mixturesfor electropolishing of three-dimensional (3D)-printed parts from nickel-based superalloys.

Uncontrolled Keywords

additive manufacturing; electropolishing; ionic electrolyte; surface finish; build orientation; Inconel625

Subjects: 2000 Materials science and technology > 2000 Materials science and technology
2000 Materials science and technology > 2001 Materials structure, properties and testing
2000 Materials science and technology > 2002 Materials processing/fabrication
2000 Materials science and technology > 2003 Metallurgy/metals/alloys
2000 Materials science and technology > 2009 Semiconductors
Department: Department of Mechanical Engineering
Funders: CRSNG/NSERC, Consortium de recherche et d'innovation en aérospatiale au Québec (CRIAQ)
PolyPublie URL: https://publications.polymtl.ca/5033/
Journal Title: Journal of Manufacturing and Materials Processing (vol. 3, no. 4)
Publisher: MDPI
DOI: 10.3390/jmmp3040086
Official URL: https://doi.org/10.3390/jmmp3040086
Date Deposited: 05 Jul 2022 12:11
Last Modified: 10 Nov 2022 21:37
Cite in APA 7: Mohammadian, N., Turenne, S., & Brailovski, V. (2019). Electropolishing of laser powder bed-fused IN625 components in an ionic electrolyte. Journal of Manufacturing and Materials Processing, 3(4), 86 (20 pages). https://doi.org/10.3390/jmmp3040086

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