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Table 5
Summary of research work reported on optimization studies related to EDM/WEDM of Nimonic superalloys.
| Reference | Work/electrode/dielectric | Input parameter | Output parameter | The focus of the work | Remark/Discussion |
|---|---|---|---|---|---|
| [123] | Nimonic 75/ Cu and brass/spark erosion oil | TM, IP, Vg, Ton, Toff, Tool lift time (TLT) | MRR, TWR, SR | MOO during EDM | Optimum parameters using Taguchi based grey relational analysis are TM = Cu, IP = 12 A, Vg = 500 V, Ton = 200 μs, Toff = 15 μs, TLT = 2 s |
| [124] | Nimonic 75/Cu, brass | TM, Ton, Toff, TLT, Vg, gap current | MRR, TWR, SR | MOO during ultrasonic-assisted EDM | Optimal parameters from Taguchi- grey relational analysis: TM = Cu, Ton = 200 μs, Toff = 15 μs, TLT = 2 s, Vg = 15 V, gap current = 12 A |
| [125] | Nimonic 90/Cu/kerosene (powder = Si) | Powder concentration, discharge current, spark on duration, spark off duration | SR, recast layer thickness | Experimental instigation of powder-mixed EDM | Powder concentration = 12 g/L, discharge current = 3 A, spark on duration = 35 μs, spark off duration = 49 μs |
| [126] | Nimonic 80A/ zinc-coated brass wire electrode | IP, Ton, Toff, FR | SR | Optimization during WEDM | From ANOVA, SR increases with a decrease in the Toff; SR is minimized by increasing the Ton and IP |
| [127] | Nimonic 80A/ Mo/de-ionized water | Duty factor (DF), Vg, FR | MRR, wire wear ratio, SR | Optimization during WEDM | Dominant factor is DF; increase in DF all output responses increase; optimum parameters are DF = 0.8771, Vg = 17 V and FR = 17 m/min |
| [128] | Nimonic C263 /Cu, W, and Cu-W/ kerosene | IP, Vg, Ton, DF, TM | SEC, machining noise, MRR, TWR, SR, radial over cut | Sustainable EDM to evaluate and optimize the responses | Optimal values from hybrid optimization; IP = 3 A, Vg = 60 V, Ton = 100 μs, DF = 85%, TM = Cu Ton has great influences on SEC; IP, and TM have a significant impact on noise, TWR, and MRR; IP is a dominant factor for SR |
| [129] | Nimonic 80A/ Cu/ kerosene | IP, Ton, Toff | SR and MRR | MOO during EDM of Nimonic 80A | Optimum RSM parameters; IP = 13.49 A, Ton = 150 μs, Toff = 4 μs; Ton shows the stronger effect on MRR followed by IP and Toff; Ton has both positive and negative impact on SR |
| [130] | Nimonic 80A/ brass wire/de-ionized water | IP, Vg, duty cycle, wire- speed | MRR and kerf width | Experimental investigation of WEDM of Nimonic 80A and MOO | RSM optimum WEDM parameters: IP = 57 A, Vg = 90 V, duty cycle = 75 μs, wire speed = 7 mm/min; IP shows high impact on MRR and kerf width |
| [131] | Nimonic 901/ Cu–W | Ton, IP, servo voltage, powder concentration | SR, TWR, MRR | Optimization of parameters of powder‑mixed EDM | From statistical results optimum parameters were Ton = 20 μs, IP = 5 A, servo voltage = 5 V, powder concentration = 10 weight% |
| [132] | Nimonic 90 /Cu | Ton, Toff, IP, powder concentration | SR, TWR, MRR | Optimization of parameters of powder (µ-titanium carbide) ‑ mixed EDM | Grey relational analysis based optimum parameters were Ton = 30 μs, Toff = 2 μs, IP = 20 A, powder concentration = 4 g/L |
| [133] | Nimonic C263/Mo | Ton, Toff, IP, voltage | SR, MRR, cycle time | Optimization of the WEDM process | Ton and Toff most influencing parameters; optimum parameter for MRR were Ton = 30 μs, Toff = 8 μs, IP = 4 A, voltage = 80 V |
| [134] | Nimonic 80A/ CBN grinding wheel | Air pressure, DOC, rotational speed, vibration intensity, stand-off-distance | Normal force, tangential force, SR | MOO of parameters of ultrasonic-assisted grinding | Optimum parameters from the statistical analysis: air pressure = 4 bar, DOC = 49.10 μm, rotational speed = 2198.02 RPM, vibration intensity = 56.85%, stand-off-distance = 52.99 mm |
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