Author:Farotade, GA; Popoola, AP; Pityana, Sisa LDate:Aug 2017The microstructural features and microhardness of ZrB(sub2) reinforced Ti-SiC coatings on Ti-6Al-4V substrate were studied.The deposition of these coatings was achieved via laser cladding technique. A 4.0 KW fiber delivered Nd: YAG laser was ...Read more
Author:Mahamood, RM; Akinlabi, ET; Shukla, M; Pityana, Sisa LDate:Mar 2013The effect of laser power on the resulting microstructure and microhardness of laser metal deposited Ti6Al4V powder on Ti6Al4V substrate has been investigated. The tracks were deposited using 99.6 % pure Ti6Al4V powder of particle size ranging ...Read more
Author:Nath, S; Pityana, Sisa L; Majumdar, JDDate:Mar 2012In the present study, laser surfac ealloying of aluminium with WC + Co + NiCr (in the ratio of 70:15:15) has been conducted using a 5 kW continuous wave (CW) Nd:YAG laser (at a beam diameter of 0.003 m), with the output power ranging from 3 ...Read more
Author:Nath, S; Pityana, Sisa L; Majumdar, JDDate:Mar 2012In the present study, laser surface alloying of aluminium with WC + Co + NiCr (in the ratio of 70:15:15) has been conducted using a 5 kW continuous wave (CW) Nd:YAG laser (at a beam diameter of 0.003 m), with the output power ranging from 3 ...Read more
Author:Erinosho, MF; Akinlabi, ET; Pityana, Sisa L; Owolabi, GDate:Jun 2017To modify the properties of Ti6Al4V alloy, Cu has been added to host an antimicrobial effect in the revised alloy for marine application. The Laser Metal Deposition (LMD) process on the Ti6Al4V alloy and Cu was been investigated for surface ...Read more
Author:Mahamood, RM; Akinlabi, ET; Shukla, M; Pityana, Sisa LDate:Feb 2013The economy of using Laser Metal Deposition (LMD) process in the manufacturing of aerospace parts depends on the right processing parameters. LMD is an additive manufacturing technology capable of producing complex parts directly from the CAD ...Read more
Author:Mathoho, Ipfi; Akinlabi, ET; Arthur, Nana KK; Tlotleng, Monnamme; Masina, Bathusile NDate:Mar 2019This study investigated the effect of laser peening on the surface integrity (surface roughness, microstructure and microhardness) of 17-4 PH stainless steel components which were built through the direct energy deposition (DED). Additive ...Read more
Author:Mutombo, KDate:Oct 2013Ti6Al4V laser manufactured samples were analysed using optical and scanning electron microscopy equipped with X-ray micro-analyser. The presence of a, a(sub2), ß, a', and a'' phases were determined using differential scanning calorimetry. The ...Read more
Author:Adesina, OS; Popoola, API; Pityana, Sisa L; Oloruntoba, DTDate:Nov 2017The enhancement of the tribological properties of titanium (Ti-6Al-4V) has been the subject of wide range research over the years. The constraints associated with Ti-6Al-4V in severe tribological conditions due of its low hardness and poor ...Read more
Author:Olakanmi, EO; Sepako, M; Morake, J; Hoosain, Shaik E; Pityana, Sisa LDate:Dec 2018This study examines the dependence of microstructural characteristics, crack frequency and diffusion kinetics of functionally graded (FGM) titanium aluminide coatings reinforced with TiC on laser energy density (LED). Samples deposited on a ...Read more
Author:Arthur, Nana KK; Pityana, Sisa LDate:Oct 2018Cylindrical components of dimensions 15 mm in diameter and 11 mm in height were laser printed by additive manufacturing using a LENS!™ system. Process parameters used in layer by layer build-ups showed that energy densities in the range of ...Read more
Author:Tlotleng, Monnamme; Makoana, Nkutwane W; Pityana, Sisa L; Masina, Bathusile NDate:Nov 2016It is difficult to produce titanium aluminides (TiAl) components because these materials lack ductility and when used as high temperature structures they fail prematurely due to the inability to self-oxidise. In this study, a 20 by 20 mm cube ...Read more
Author:Bayode, A; Pityana, Sisa L; Akinlabi, ETDate:Oct 2016Laser metal deposition (LMD) is an additive manufacturing process. Unlike conventional manufacturing process which is subtractive, LMD produces part layer by layer from the ground up and has been used to fabricate fully dense components using ...Read more
Author:Mathoho, Ipfi; Arthur, Nana KK; Tlotleng, MonnammeDate:Feb 2023The current study embarked on developing the H950 aging condition for 17-4 PH stainless steel that was manufactured through the DED process. The driving force for carrying out this study was that, when the H950 condition was applied to 17-4 ...Read more
Author:Akinlabi, ET; Nyembwe, KD; Pityana, Sisa L; Shongwe, MB; Ochonogor, OFDate:Jan 2017Manufacture of hybrid Ti6Al4 V alloy systems for application specifically in hot parts of turbine engines has been a challenge in recent years. This is due to the need to increase efficiency and reduce combustion rate and emission. In this ...Read more
Author:Gbadeyan, OJ; Bright, G; Sithole, Bishop B; Adali, SDate:Feb 2020In this study, microhardness and flow strength (tensile) of a shell of an African Giant snail (Achatina Fulica) were studied as a function of indentation load. The influence of loading direction on the hardness of the nacreous and prismatic ...Read more
Author:Mahamood, RM; Akinlabi, ET; Shukla, M; Pityana, Sisa LDate:Sep 2013Ti6Al4V is the most widely used titanium alloy in the aerospace industry because of its excellent properties. However, the wear resistance behaviour of this material is not very impressive and surface damage occurs in applications involving ...Read more
Author:Curle, UA; Möller, H; Wilkins, JDDate:Feb 2011It is demonstrated experimentally that by using the Council for Scientific and Industrial Research Rheo Casting system and high pressure die casting it is possible to semi-solid process and cast into a shape unmodified Al–Si binary eutectic ...Read more
Author:Adesina, OS; Popoola, API; Pityana, Sisa L; Oloruntoba, DTDate:Dec 2017Titanium alloys have been used for variety of engineering applications but their relatively low hardness and low thermal conductivity are shortcomings that have reduced their potential use. In this work, attempts have been made to study the ...Read more
Author:Kumar, A; Pityana, Sisa L; Dutta Majumdar, JDate:2010The present study concerns an in depth investigation of the influence of laser surface melting of AISI 316L stainless steel using Ar and N2 as shrouding atmosphere. Laser surface melting has been carried out using a 5 kW continuous wave (CW) ...Read more