Experimental investigation of magnetic-field-assisted electric discharge machining by silicon-based dielectric of Incone
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Sådhanå (2020) 45:253 https://doi.org/10.1007/s12046-020-01493-0
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Experimental investigation of magnetic-field-assisted electric discharge machining by silicon-based dielectric of Inconel 706 superalloy SUSHIL KUMAR* , MUDIMALLANA GOUD and NARENDRA MOHAN SURI Department of Production and Industrial Engineering, Punjab Engineering College (Deemed to be University), Chandigarh 160012, India e-mail: [email protected]; [email protected]; [email protected] MS received 5 March 2020; revised 1 August 2020; accepted 29 August 2020 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 microglobules 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. Keywords.
EDM; Inconel 706; silicon carbide; magnetic field; FESEM.
1. Introduction Inconel 706 is an advanced superalloy that possesses higher strength along with ease of fabricability [1]. Inconel 706 can be shaped with large size diameter, which makes it convenient for making turbine disks owing to its outstanding chemical stability and being less susceptible to segregation phenomenon [2, 3]. Improved gas turbine engines need higher firing temperature and compression ratio, which makes it essential to employ Inconel 706 for the rotors [4]. The high fatigue strength of nickel-based superalloys even at increased service temperature is a perfect choice for numerous industries, including the aerospace sector. Nevertheless, it is difficult to machine these superalloys [5]. Generally, the machining through the conventional processes of these superalloys offers poor machining efficiency, minimum dimensional characteristics and poor surface attribute of the specimens produced. These types of challenges are often because of the phenomenon of work-hardening, abrasive nature and lower thermal conductivity of these superalloys [6, 7]. Therefore, to resolve these problems, the non-traditional machining processes such as abrasive water jet machining (AWJM), *For correspondence
electrochemical machining (ECM), wire electrical disc
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