Machinability studies on metal additive manufactured 316L stainless steel using electrochemical machine
Original scientific paper
DOI:
https://doi.org/10.5599/jese.2567Keywords:
Additively built austenitic steel, micromachined holes, electrochemical process parameters, multi-objective optimization (MOORA), entropy weighting; variance analysisAbstract
Metal additive manufactured 316L stainless steel is considered for machinability studies through electrochemical machining (ECM). This material is used in prototyping in the automotive, aerospace, jewellery and biomedical industries, where customized components for individual circumstances are required. In this study, ECM process parameters such as voltage, electrolyte concentration, duty cycle, and selection of an L16 orthogonal array sing four levels were considered for optimization. The multi-criteria decision machining method, namely entropy-based multi-objective optimization, is used for performance analysis based on the ratio analysis method. The study reveals that 14 V, 35 g l-1 NaNO3 electrolyte concen¬tration, and 90 % duty cycle are recommended for optimal machining performance. Accord¬ing to the main effect table, the best combination is 16 V, 35 g l-1 electrolyte concentration, and 60 % duty cycle. Analysis of variance result shows that the duty cycle accounts for approximately 27.06 1% of machining performance, voltage contributes by 24.015 % and electrolyte content contributes roughly 15.58 % to the machining performance. A scanning electron microscope was used to scan each micromachined hole, and different resolution images were taken in order to analyse the machined hole quality.
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