Effect of Cryogenically Treated Electrode during AEDM of Nickel Based Super Alloy 718 for Surface Quality Improvement

Abstract:

In this experimental study attempt has been made to realize potential of cryogenic treatment in enhancing surface quality with fine aluminum and graphite additives powders in AEDM of nickel based super alloy Inconel 718. L₃₆ (2³x3⁶) Orthogonal Array has been selected to conduct and analyze experiments based on Taguchi methodology. Polarity, peak current, pulse on time, duty cycle, gap voltage, retract distance, concentration of fine aluminum and graphite powder added into the dielectric fluid are chosen as input process variables to study performance in terms of surface roughness (SR) using copper and deep cryogenically treated copper electrode. It is found experimentally that deep cryogenically treated copper electrode with addition of 6g/l graphite powder improves surface roughness appreciably. The same has been supported by SEM analysis of the machined surface.

• Periodical: Advanced Materials Research (Volume 410)
• Pages: 236-239
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.410.236
• Online since: November 2011
• Authors: Anil Kumar, S. Maheshwari, C. Sharma
• Keywords: AEDM, Cryogenic Treatment, SEM, Surface Roughness (SR), Taguchi Methodology

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