Title: Electric discharge coating process variation and its wear properties

Authors: Ilangovan Arun; C. Yuvaraj; G. Chandra Sekhar Reddy; Nara Siva Balaji

Addresses: Centre for Advanced Material Processing, Madanapalle Institute of Technology and Science, Madanapalle – 517325, Andhra Pradesh, India ' Centre for Advanced Material Processing, Madanapalle Institute of Technology and Science, Madanapalle – 517325, Andhra Pradesh, India ' Centre for Advanced Material Processing, Madanapalle Institute of Technology and Science, Madanapalle – 517325, Andhra Pradesh, India ' Centre for Advanced Material Processing, Madanapalle Institute of Technology and Science, Madanapalle – 517325, Andhra Pradesh, India

Abstract: The present study elaborates and compare about process variation of electrical discharge coating process through powder mixed and powder metallurgy (semi-sintered) electrode that influences mechanical and metallurgical properties of over duplex stainless. Occurrences of surface roughness, poke, splatters and carters are minimal in deposition of pyrolysis carbon while using the powder metallurgical electrode process of deposition than of powder mixed. Coating layer thickness and porosity are greater in powder mixed having a similar decarburising depth that deserves hardness values with an average of 1,001 HV to 1,010 HV across its section. Pyrolysis carbon restricts alloying element deposition that reduced frictional coefficient with greater wear rate compared with the powder metallurgical process. The metallurgical characterisation is performed through a scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDS), phase identification through X-ray powder diffraction (XRD), optical microscope (OM), mechanical testing through Vickers microhardness, and wear testing by pin-on-disc (POD) tribometer.

Keywords: electrical discharge coating; porosity; decarburising depth; phase transformation carbon flakes; hardness; wear.

DOI: 10.1504/IJSURFSE.2021.116329

International Journal of Surface Science and Engineering, 2021 Vol.15 No.2, pp.131 - 151

Received: 23 Aug 2020
Accepted: 28 Oct 2020

Published online: 08 Jul 2021 *

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