OPTIMIZATION AND SURFACE MODIFICATION OF Al-6351 ALLOY USING SiC–Cu GREEN COMPACT ELECTRODE BY ELECTRO DISCHARGE COATING PROCESS

Sujoy Chakraborty, Siddhartha Kar, Vidyut Dey and Subrata Kumar Ghosh
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Sujoy Chakraborty: Department of Production Engineering, NIT Agartala, Tripura, India
Siddhartha Kar: Department of Production Engineering, NIT Agartala, Tripura, India
Vidyut Dey: Department of Production Engineering, NIT Agartala, Tripura, India
Subrata Kumar Ghosh: #x2020;Department of Mechanical Engineering, NIT Agartala, Tripura, India

Surface Review and Letters (SRL), 2017, vol. 24, issue 01, 1-12

Abstract: This paper introduces the surface modification of Al-6351 alloy by green compact SiC–Cu electrode using electro-discharge coating (EDC) process. A Taguchi L-16 orthogonal array is employed to investigate the process by varying tool parameters like composition and compaction load and electro-discharge machining (EDM) parameters like pulse-on time and peak current. Material deposition rate (MDR), tool wear rate (TWR) and surface roughness (SR) are measured on the coated specimens. An optimum condition is achieved by formulating overall evaluation criteria (OEC), which combines multi-objective task into a single index. The signal-to-noise (S/N) ratio, and the analysis of variance (ANOVA) is employed to investigate the effect of relevant process parameters. A confirmation test is conducted based on optimal process parameters and experimental results are provided to illustrate the effectiveness of this approach. The modified surface is characterized by optical microscope and X-ray diffraction (XRD) analysis. XRD analysis of the deposited layer confirmed the transfer of tool materials to the work surface and formation of inter-metallic phases. The micro-hardness of the resulting composite layer is also measured which is 1.5–3 times more than work material’s one and highest layer thickness (LT) of 83.644μm has been successfully achieved.

Keywords: Electro discharge coating; powder metallurgy; green compact electrode; overall evaluation criteria (search for similar items in EconPapers)
Date: 2017
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DOI: 10.1142/S0218625X1750007X

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