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Journal of Materials Engineering and Performance

Published in:

24-12-2015

Effect of Powder-Suspended Dielectric on the EDM Characteristics of Inconel 625

Authors: Gangadharudu Talla, S. Gangopadhyay, C. K. Biswas

Published in: Journal of Materials Engineering and Performance | Issue 2/2016

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Abstract

The current work attempts to establish the criteria for powder material selection by investigating the influence of various powder-suspended dielectrics and machining parameters on various EDM characteristics of Inconel 625 (a nickel-based super alloy) which is nowadays regularly used in aerospace, chemical, and marine industries. The powders include aluminum (Al), graphite, and silicon (Si) that have significant variation in their thermo-physical characteristics. Results showed that powder properties like electrical conductivity, thermal conductivity, density, and hardness play a significant role in changing the machining performance and the quality of the machined surface. Among the three powders, highest material removal rate was observed for graphite powder due to its high electrical and thermal conductivities. Best surface finish and least radial overcut (ROC) were attained using Si powder. Maximum microhardness was found for Si due to its low thermal conductivity and high hardness. It is followed by graphite and aluminum powders. Addition of powder to the dielectric has increased the crater diameter due to expansion of plasma channel. Powder-mixed EDM (PMEDM) was also effective in lowering the density of surface cracks with least number of cracks obtained with graphite powder. X-ray diffraction analysis indicated possible formation of metal carbides along with grain growth phenomenon of Inconel 625 after PMEDM.

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Title: Effect of Powder-Suspended Dielectric on the EDM Characteristics of Inconel 625
Authors: Gangadharudu Talla
S. Gangopadhyay
C. K. Biswas
Publication date: 24-12-2015
Publisher: Springer US
Published in: Journal of Materials Engineering and Performance / Issue 2/2016
Print ISSN: 1059-9495
Electronic ISSN: 1544-1024
DOI: https://doi.org/10.1007/s11665-015-1835-0

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