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Experimental investigation of magnetic-field-assisted electric discharge machining by silicon-based dielectric of Inconel 706 superalloy

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Abstract

Inconel 706 is a nickel–iron-based superalloy having higher mechanical strength along with easiness of fabrication, which makes it suitable for gas turbine disk applications. The current study investigates the hybrid magnetic-field-assisted powder mixed electric discharge machining (MFAPMEDM) process to improve performance in machining Inconel 706. For conducting experiments, an in-house set-up was designed and fabricated. Experiments were conducted according to the Taguchi L9 OA and ANOVA to examine the effect of the peak current (Ip) and pulse duration (P-on/P-off) on the material removal rate (MRR) and surface roughness (Ra) of the machined samples. The quality of the machined surface is assessed using a field emission scanning electron microscope (FESEM), which has revealed the presence of micro-holes, melted debris and micro-globules on the machined specimen surface. The Ra is significantly affected by Ip (49.63%) and P-off (37.12%). Further, Ip has more than 78% contribution to the MRR. Furthermore, a mathematical model has been established to develop the relation between input and output factors.

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Abbreviations

MFAPMEDM:

Magnetic-field-assisted powder mixed electrical discharge machining

EDM:

Electrical discharge machining

dB:

Decibels

T:

Tesla

I p :

Peak current

P-off:

Pulse-off time

P-on:

Pulse-on time

R a :

Surface roughness

MRR:

Material removal rate

SiC:

Silicon carbide

TWR:

Tool wear rate

FESEM:

Field emission scanning electron microscope

S/N ratio:

Signal to noise ratio

OA:

Orthogonal array

DF:

Degrees of freedom

Adj MS:

Adjusted mean square

Adj SS:

Adjusted sums of squares

ANOVA:

Analysis of variance

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Authors and Affiliations

  1. Department of Production and Industrial Engineering, Punjab Engineering College (Deemed to be University), Chandigarh, 160012, India

    Sushil Kumar, Mudimallana Goud & Narendra Mohan Suri

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  1. Sushil Kumar
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  2. Mudimallana Goud
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  3. Narendra Mohan Suri
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Correspondence to Sushil Kumar.

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Kumar, S., Goud, M. & Suri, N.M. Experimental investigation of magnetic-field-assisted electric discharge machining by silicon-based dielectric of Inconel 706 superalloy. Sādhanā 45, 253 (2020). https://doi.org/10.1007/s12046-020-01493-0

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