Thesis (MTech. degree in Metallurgical Engineering)--Tshwane University of Technology, 2011. / The mechanisms by which stainless steel matrix surface composites reinforced with titanium carbide (TiC) and tungsten carbide (WC) cermets synthesized using laser technique was investigated in this study. The relationships between process parameters and the properties of the synthesized composite were studied. The morphologies and microstructures of the composite coatings were investigated using optical microscopy and high resolution scanning electron microscopy equipped with an energy dispersive spectroscopy (EDS), while the phase change and interactions were observed using x-ray diffraction (XRD). Surface hardness of the composite layers was determined using the Vickers microhardness tester while its corrosion behaviour in 3.5% NaCl solution was investigated by using potentiodynamic polarization curve measurement method.TiC reinforced 2507 DSS showed a greater resistance to corrosion than 304L austenitic and 2205 duplex stainless steel in the medium. This was attributed to the presence of titanium and equal volume proportion of ferrite and austenite in the structure of the 2507 stainless steel coupled with higher content of chromium in its composition.
|Obadele, Babatunde Abiodun.
|Olubambi, P. A.
|South African National ETD Portal
|©2011 Tshwane University of Technology
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