Green electrochemical polishing of EBM Ti6Al4V samples with preliminary fatigue results

Additive manufacturing technologies have several well-known advantages; however, the surface quality of the printed parts is poor, compromising the corrosion and mechanical properties. Thus, surface finishing treatments are necessary. The most post-processing treatments proposed in the literature ar...

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Bibliographic Details
Published in:International journal of advanced manufacturing technology 2023-06, Vol.126 (9-10), p.4269-4282
Main Authors: Acquesta, Annalisa, Monetta, Tullio, Franchitti, Stefania, Borrelli, Rosario, Viscusi, Antonio, Perna, Alessia Serena, Penta, Francesco, Esposito, Luca, Carrino, Luigi
Format: Article
Language:English
Subjects:
Acids
Additive manufacturing
Advanced manufacturing technologies
CAE) and Design
Chemical polishing
Computer-Aided Engineering (CAD
Corrosion
Electron beam melting
Electropolishing
Engineering
Fatigue life
Industrial and Production Engineering
Lasers
Mechanical Engineering
Mechanical properties
Media Management
Original Article
Reagents
Reduction (electrolytic)
Roughness
Stress ratio
Surface finishing
Surface properties
Surface treatment
Titanium alloys
Titanium base alloys
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Summary:Additive manufacturing technologies have several well-known advantages; however, the surface quality of the printed parts is poor, compromising the corrosion and mechanical properties. Thus, surface finishing treatments are necessary. The most post-processing treatments proposed in the literature are mechanical or chemical. The formers are contact techniques and cannot be suitable for complex geometry, while the latter use strong and dangerous reagents. This paper is aimed to investigate the effect of the electropolishing treatment, a contactless technique, using an eco-friendly electrolytic solution in reducing the roughness and improving the fatigue properties of Ti6Al4V specimens produced by electron beam melting technology. Several parameters affecting the effectiveness of the electropolishing treatment have been investigated, as interelectrode distance, stirring rate and duration time. An optimal combination of them allowed a uniform surface treatment and a significant roughness reduction (64% of Sa reduction for cylindrical specimens). Under sinusoidal loading conditions with a maximum stress of 378 MPa and a stress ratio equal to R  = 0.1, the mean fatigue life of electropolished dog-bone specimens was 250% longer than that of as-built specimens.
ISSN:0268-3768
1433-3015
DOI:10.1007/s00170-023-11400-6