Title: Microstructural characteristics of pure titanium by WEDM

Authors: R. Chalisgaonkar; Jatinder Kumar

Addresses: Mechanical Engineering Department, Krishna Institute of Engineering and Technology, Ghaziabad, Uttar Pradesh 201206, India ' Department of Mechanical Engineering, National Institute of Technology, Kurukshetra 136119, Haryana, India

Abstract: In this research work pure titanium was machined with WEDM process with zinc coated wire electrode having Ø0.25 mm. Experimentation was conducted as per Taguchi's L27 orthogonal array for investigating the influence of process parameters such as pulse on time (TON), pulse off time (TOFF), peak current (IP), wire feed (WF), wire tension (WT) and servo voltage (SV) on surface integrity of the titanium. Scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive X-ray (EDX) analysis was performed for selected WEDM machined samples of titanium. It was observed that changing the discharge energy level through systematic variation of WEDM process parameters results in significant variation in the surface characteristics (such as craters, cracks, debris, recast layer and spherical deposits), material migration from tool (wire) and inter-metallic compounds formed on surface of titanium after WEDM. A mechanistic model has also been developed for prediction of recast layer thickness using dimensional analysis.

Keywords: WEDM; wire EDM; electrical discharge machining; titanium; Taguchi methods; robust design; surface integrity; microstructure; recast layer; EDX; energy dispersive X-ray; XRD; X-ray diffraction; electrico-discharge machining; orthogonal arrays; pulse on time; pulse off time; peak current; wire feed; wire tension; servo voltage; recast layer thickness; mechanistic modelling.

DOI: 10.1504/IJMMP.2014.067308

International Journal of Microstructure and Materials Properties, 2014 Vol.9 No.6, pp.463 - 484

Received: 23 Jan 2014
Accepted: 10 Jun 2014
Published online: 04 Feb 2015 *

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