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Machinability of Nimonic Alloy 90 in µ-Titanium Carbide Mixed Electrical Discharge Machining

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Abstract

Nimonic Alloy 90 is a superalloy used to make critical parts such as nozzles in aerospace applications. Superalloys are tougher materials, and their machinability for converting them into useful products with required shape is very poor. Hence, this work concentrated on understanding their machinability using the process of EDM with the presence of titanium carbide micron powders. The investigational parameters were Pulse ON time (TON), Pulse OFF time (TOFF), current (IC), and powder concentration (PCON) in understanding the performance characteristics while making blind holes. TiC powder of 40 µm size was mixed to the dielectric fluid. 16 trails were performed by varying the parameters at four levels with copper electrode for machining. Taguchi’s L16 orthogonal array was used for experimentation, and the parameters for better performance were identified by using Taguchi signal-to-noise (S/N) ratio and grey relational analysis. The FESEM images showed the embedment of TiC particles on the machined surface. The thickness of the white layer formed was at its lowest for the least value of powder concentration.

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SD Experimental design, experimentation, analysis and manuscript preparation, ML Project administration, TK Supervision, VV Resources.

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Correspondence to Dinesh Sundaresan.

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Sundaresan, D., Marappan, L., Thangavelu, K. et al. Machinability of Nimonic Alloy 90 in µ-Titanium Carbide Mixed Electrical Discharge Machining. Arab J Sci Eng 47, 15223–15243 (2022). https://doi.org/10.1007/s13369-021-06499-2

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  • DOI: https://doi.org/10.1007/s13369-021-06499-2

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