Author:Adesina, OS; Popoola, API; Pityana, Sisa L; Oloruntoba, DTDate:2018The corrosion behavior of titanium alloys when used for various dynamic offshore components has been a major concern of titanium drilling risers in deepwater energy extraction. A way of achieving specified requirement is the development of ...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:Masina, Bathusile N; Lengopeng, Thabo; Pityana, Sisa L; Tlotleng, MonnammeDate:Nov 2017In this study, TiAl alloy was coated on Ti64 using a 1074nm high power continuous-wave laser while varying the laser beam scanning speed. This was done in order to increase the thermo-mechanical properties of Ti64. Scanning electron microscopy ...Read more
Author:Raji, SA; Popoola, API; Pityana, Sisa L; Monnamme, TlotlengDate:Mar 2021Intermetallics based on gamma titanium aluminide ( -TiAl) alloys are potential lightweight materials that can be used for high-temperature components. However, poor room temperature ductility hinders their full potential for producing components ...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:Madikezela, C; Cornish, LA; Chown, LH; Moller, HDate:Feb 2019Beta Ti-alloys are known for their high fracture toughness and ductility, and are used in applications where these properties are needed, such as the aerospace and biomedical industries. The selective laser melting of the alpha + beta Ti-6Al-4V ...Read more
Author:Raganya, Mampai L; Moshokoa, Nthabiseng A; Obadele, B; Makhatha, E; Machaka, RonaldDate:Jun 2021The aim of this study is to investigate the effect of niobium on the microstructure and mechanical properties of Ti-Mo-Nb alloys, which include Ti-11.1Mo-10.8Nb (TMN1), Ti-10.2Mo-19.5Nb (TMN2), and Ti-9.2Mo-26.7Nb (TMN3) alloys designed using ...Read more
Author:Sibisi, PN; Popoola, API; Kanyane, LR; Fatoba, OS; Adesina, OS; Arthur, Nana KK; Pityana, Sisa LDate:Mar 2019Failure of engineering components on application is mainly a result of poor surface behavior of materials under certain conditions. Titanium and its alloys have numerous beneficial properties including light weight, high strength and excellent ...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; Akinlabi, ET; Arthur, Nana KKDate:Nov 2019The current study focused on optimizing heat treatment parameters of 17-4 PH stainless steel produced on a LENS platform. The fundamental objective of the current study as to attain the microhardness of the as received machined sample which ...Read more
Author:Bolokang, AS; Phasha, MJ; Motaung, DE; Cummings, FR; Muller, TFG; Arendse, CJDate:Oct 2014Water quenching of unmilled Ti compact has yielded martensitic-type laths and fishbone-type twinned microstructures, with a', a'' and FCC phases induced. Upon quenching 30 h milled and (0+30) h mixed powders at 1200 °C, a', FCC, tetragonal ...Read more
Author:Nuru, ZY; Khamlich, S; Roro, Kittessa T; Muller, TFG; Arendse, CJ; Maaza, MDate:Jul 2011Monodispersed spherical core-shell particles of Cr/a-Cr2O3 cermet ACG coatings investigated within this contribution could be successfully employed in thermal converters. Their selectivity depends on their chemical, physical and structural ...Read more
Author:Raganya, Mampai L; Moshokoa, Thabiseng; Machaka, Ronald; Obadele, B; Makhatha, MDate:Dec 2022Current research is focused on development of ß-type titanium alloys for biomedical applications as substitutes of the undesirable Ti6Al4V alloy. Ti6Al4V alloy has a higher elastic modulus (110 GPa) than that of the human bone (10-30 GPa) and ...Read more
Author:Aramide, B; Sadiku, R; Popoola, P; Pityana, Sisa L; Jamiru, TDate:Jan 2022The enhancement of wear performance of steel baseplate for tillage application was carried out by manufacturing vanadium-chromium carbide coatings in situ by powder infusion of high carbon ferrochrome FeCrV15 powder through laser additive ...Read more
Author:Popoola, AP; Pityana, Sisa L; Ogunmuyiwa, EDate:Oct 2010Al/TiB2 metal matrix composite (MMCs) was fabricated on aluminium AA1200 with the aim of improving the wear resistance property of the substrate. The characterization of the MMCs was carried out by Optical Microscopy (OM), Scanning Electron ...Read more
Author:Ochonogor, OF; Meacock, C; Pityana, Sisa L; Popoola, PAI; Dutta Majumder, JDate:Sep 2012Laser metal deposition (LMD) is an additive manufacturing technique whereby a stream of metal powder is consolidated by a focused laser beam on the surface of a substrate or engineering component. The interaction zone between the laser beam ...Read more
Author:Davoren, B; Sacks, N; Theron, MarithaDate:Jun 2021To assess if a WC-9.2wt%Monel 400 alloy properties could be improved using LENS, one alloy was deposited onto a heated substrate and a second alloy was subjected to laser remelting of the final deposited layer. Microstructural characterization ...Read more
Author:Banerjee, R; Ray, Suprakas S; Ghosh, AKDate:Apr 2018The present work is a novel attempt to understand the microstructure of styrene-ethylene-butylene-styrene (SEBS)/polystyrene (PS) blends not only through morphological studies, but also thermal, mechanical and rheological characterizations. ...Read more
Author:Van Rooyen, Corney; Burger, HP; Kazadi, BPDate:Aug 2006Laser cladding offers distinct advantages including low dilution, low heat input,less distortion, increased mechanical and corrosion properties excellent repeatability and control of process
parameters. Solidification of laser cladded ...Read more