Title: Machinability study of austempered ductile iron using die-sinking EDM

Authors: Pranjal Sarma; Dibya Jyoti Borah; Promod Kumar Patowari; Ajay Likhite

Addresses: Department of Mechanical Engineering, Assam Don Bosco University, Guwahati, 781017, Assam, India; Department of Mechanical Engineering, National Institute of Technology Silchar, Silchar, Assam, India ' Department of Mechanical Engineering, National Institute of Technology Silchar, Silchar, Assam, India; Kameng Hydro Electric Project, NEEPCO LTD., West Kameng, Arunachal Pradesh, India ' Department of Mechanical Engineering, National Institute of Technology Silchar, Silchar, Assam, India ' Department of Metallurgical and Materials Engineering, Visvesvaraya National Institute of Technology, Nagpur, Maharashtra, India

Abstract: Austempered ductile iron (ADI) is a comparatively a new class of material having interesting properties. However, it is difficult to machine by conventional methods. Here we report the EDM processing response of ADI under various parametric conditions. The effect of peak current (I_P), pulse on time (T_on) and dielectric flushing pressure (P_f) on response parameters: material removal rate (MRR), tool wear rate (TWR) and surface roughness (SR) are investigated. Study reveals that EDM can be used to effectively machine ADI under the investigated range. Results show that, increase in I_p and T_on increases MRR, TWR as well as SR. The MRR and TWR is found to first increase with the increase in P_f and at higher values of P_f both the MRR and TWR found to decrease. Surface micrographs of machined surface using scanning electron microscope (SEM) also reveal some initiation of micro cracks on the machined surface from the graphite-matrix interface.

Keywords: electrical discharge machining; EDM; austempered ductile iron; ADI; austempering; ductile iron; machinability; machining; SEM.

DOI: 10.1504/IJMMM.2022.125201

International Journal of Machining and Machinability of Materials, 2022 Vol.24 No.3/4, pp.314 - 329

Received: 16 Feb 2022
Accepted: 01 Jun 2022
Published online: 01 Sep 2022 *

Full-text access for editors Full-text access for subscribers Purchase this article Comment on this article