Laser re-melting of HVOF thermal sprayed WC-12Co mixed with Inconel-625 coatings for erosion/ corrosion applications

2^nd International Conference and Exhibition on Industrial Engineering

November 16-18, 2015 Dubai, UAE

N Al Harbi, A Al Hamed, C P Karthikeyan, R Padmanabhan, K Y Benyounis and J Stokes

Dublin City University, Ireland VIT University, India

Posters-Accepted Abstracts: Ind Eng Manage

Abstract :

One of the obstacles of the spray coating process is the porosity of the coated layer, which can majorly affect its performance especially in erosion/corrosion preventative applications. In this research, three coating materials have been prepared, Tungsten carbide cobalt (WC-12Co) of both conventional micro sized Diamalloy 2004 and superfine nanostructured InfralloyTM S7412, mixed with Inconel 625 (Ni-Cr alloy) Diamalloy 1005 to produce very hard coatings applied by HVOF thermally sprayed process onto carbon steel 4041 substrates. The present study will look at investigating the effect of laser post heat treatment of these coatings, to identify if this technique would increase the wear/corrosion protective properties of the coating composite. The substrates were laser treated by varying laser power and scanning speed to five levels each. Using sophisticated techniques such as SEM, EDS and XRD the microstructure, microhardness and the porosity before and after the laser treatment were observed. It was found that the porosity of the coated layer had significantly reduced after the laser treatment. It was noticed that the hardness was strongly related to the amount of the nano particles of WC-12Co as well as the laser parameters.

Biography :

Email: naif.alharbi2@mail.dcu.ie