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  • Labuschagne, K; Pityana, SL (2005-07)
    In view of the importance of material degradation during laser irradiation, which can have deleterious effects on mechanical and chemical properties of a component, a study was initiated to determine a threshold at which ...
  • Mahamood, RM; Akinlabi, ET; Shukla, M; Pityana, S (IMECS 2013, 2013-03)
    The 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 ...
  • Michaelis, MM; Forbes, A; Klopper, W; Bencherif, H; Jolivet, S; Moorgawa, R; McKenzie, E; Turner, G (Academy of Science of South Africa, 2006-07)
    Three sets of laser propulsion experiments have been conducted in South Africa. The first, on the MLIS kilowatt CO2 laser at Pelindaba, gave a surprisingly good result but could not be repeated after the laser chain was ...
  • Michaelis, MM; Forbes, A (Academy of Science of South Africa, 2006-07)
    Early proposals for laser propulsion were surveyed. Propulsion theory and laboratory momentum coupling experiments demonstrate how it is possible to choose the target material so as to optimize payload efficiency, with a ...
  • Glaser, D; Polese, C; Bedekar, RD; Plaisier, J; Pityana, S; Masina, B; Mathebula, T; Troiani, E (2014-03)
    Laser Shock Peening (LSP) is a material enhancement process used to introduce compressive residual stresses in metallic components. This investigation explored the effects of different combinations of LSP parameters, such ...
  • Forbes, PBC (Medical & Scientific Publishers, 2008)
    Polycyclic aromatic hydrocarbons (PAHs) occur in oil, coal and tar deposits, and are produced as byproducts of fuel burning (whether fossil fuel or biomass). At elevated levels, these pollutants are of concern due to their ...
  • Popoola, AP; Pityana, S (2010-10)
    The present work deals with the development of Aluminium metal matrix composite (MMC) using TiB2 reinforcement. The aim is to improve the microhardness property of the substrate. The surface of the aluminium was sand blasted ...
  • Lekala, MB; Van der Merwe, JW; Pityana, SL (Hindawi, 2012-05)
    The surfaces of AISI 316L stainless steel were laser alloyed with ruthenium powder and a mixture of ruthenium and nickel powders using a cw Nd:YAG laser set at fixed operating parameters. The microstructure, elemental ...
  • Nath, S; Pityana, S; Majumdar, JD (Elsevier, 2012-03)
    In 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 ...
  • Nath, S; Pityana, S; Majumdar, JD (Elsevier, 2012-03)
    In 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 ...
  • Mabhali, Luyolo AB; Pityana, SL; Sacks, N (Taylor & Francis, 2010-12)
    An Nd:YAG laser was used for surface alloying of aluminum AA1200. The alloying powder was a mixture of Ni and SiC in different ratios. A study of the microstructures obtained after alloying was conducted using optical and ...
  • Kumar, A; Roy, SK; Burger, H; Majumdar, JD (2014)
    The present study concerns an in-depth investigation of the influence of laser surface cladding of Ti-6Al-4V on the microstructure (both the top surface, cross-section and interface), wear resistance, corrosion resistance ...
  • Seleka, TS; Pityana, SL (2006-11)
    Laser surface melting has been conducted on a 304 stainless steel (SS) with the aim of enhancing pitting corrosion resistance of the material. This process involves rapid melting of the material’s surface followed by rapid ...
  • Loveday, PW; Long, CS (Elsevier, 2014-11)
    The ability to measure the individual modes of propagation is very beneficial during the development of guided wave ultrasound based rail monitoring systems. Scanning laser vibrometers can measure the displacement at a ...
  • Van Rooyen, C (2009-11)
    This presentation looks at the experimental procedure and results of laser welding of maraging steel rocker motor casing. It concludes that a fracture occurred in weld metal of autogenous welding and that a fracture occurred ...
  • Akhter, R; Ivanchev, L; Van Rooyen, C; Kazadi, BP; Burger, HP (Trans Tech Publications Ltd, 2006)
    Samples of aluminium alloy A356 were manufactured by Semi Solid Metals HPDC technology, developed recently in CSIR, Pretoria. They were butt welded in as cast conditions using as Nd: YAG laser. The best metal and weld ...
  • Baloyi, NM; Pityana, SL; Tlotleng, Monnamme; Meacock, C; Popoola, P (Microscopy Society of South Africa, 2012-12)
    Laser coating is an advanced coating technology used for improving the surface properties of metal components. The coatings produced are thick, dense, and crack-free with continuous non-porous microstructures having uniform ...
  • Tlotleng, Monnamme; Sukla, M; Akinlabi, E; Pityana, S (2013-08)
    This research work seeks to establish titanium alloys (Ti-6Al-4V), in the field of tissue engineering, as material of interest for bone replacement with a particular focus on hip implants replacement. The aim of this study ...
  • Kumar, S; Pityana, S (2010-11)
    For making metallic products through Additive Manufacturing (AM) processes, laser-based systems play very significant roles. Laser-based processes such as Selective Laser Melting (SLM) and Laser Engineered Net Shaping ...
  • Anochie-Boateng, Joseph; Komba, Julius J; O'Connell, Johannes S (2011-07)
    There are concerns about the standard methods/procedures for quantifying shape properties of rock aggregates used in road and airfield pavements. The CSIR has recently acquired a portable three-dimensional (3D) laser ...