INFLUENCE OF ZrB2 ADDITION ON MICROSTRUCTURAL DEVELOPMENT AND MICROHARDNESS OF Ti-SiC CLAD COATINGS ON Ti6Al4V SUBSTRATE

G. A. Farotade, A. P. I. Popoola and S. L. Pityana
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G. A. Farotade: Department of Chemical, Metallurgical and Materials Engineering, Faculty of Engineering and Built Environment, Tshwane University of Technology, Pretoria 0001, South Africa
A. P. I. Popoola: Department of Chemical, Metallurgical and Materials Engineering, Faculty of Engineering and Built Environment, Tshwane University of Technology, Pretoria 0001, South Africa
S. L. Pityana: #x2020;National Laser Centre, Council for Scientific and Industrial Research, Pretoria, South Africa

Surface Review and Letters (SRL), 2018, vol. 25, issue 06, 1-8

Abstract: The microstructural features and microhardness of ZrB2-reinforced Ti-SiC coatings on Ti-6Al-4V substrate were studied. The deposition of these coatings was achieved via laser cladding technique. A 4.0kW fiber-delivered Nd: YAG laser was used to deposit the coatings on the titanium substrate at a laser power of 700W and a laser scan speed of 0.8m/min. An initial Ti-SiC coating was deposited with no ZrB2 addition followed by deposition of two other coatings with the incorporation of ZrB2 powder at 5 and 10wt.%. The coatings were examined using scanning electron microscope (SEM) coupled with energy dispersive spectroscopy. SEM images of Ti-SiC-ZrB2 coatings revealed good metallurgical bond between the coatings and the substrate and also a significant increment in dendritic formation and inter-dendritic eutectics during solidification within the α-Ti matrix, exhibiting the presence of newly formed phases as the weight percentage of ZrB2 increased. Back-scattered electron images also showed the dissolution effect of SiC particles, as the particle–matrix bond strength is influenced by ZrB2 addition. Furthermore, the microhardness of the Ti-SiC coating was enhanced with increasing ZrB2 weight percentage. X-ray diffraction analysis revealed dominant compounds formed during laser material processing. This study deepens the knowledge of possible microstructural features associated with Ti-SiC-ZrB2 cermet coatings.

Keywords: Ti-SiC-ZrB2 cermet coatings; microstructure; microhardness; laser cladding; Ti-6Al-4V titanium alloy (search for similar items in EconPapers)
Date: 2018
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DOI: 10.1142/S0218625X19500057

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