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Browsing by Author "Pityana, Sisa L"

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Addition of Chromium and its effect on the microstructure and mechanical properties of laser- coated high carbon ferrochrome alloy on mild steel

Author: Aramide, BP ; Popoola, P ; Sadiku, R ; Jamiru, T ; Pityana, Sisa L Date: Aug 2021 Laser cladding is an additive manufacturing technology that can be utilized in surface strengthening, modification, and repair of components that are subjected to adverse working conditions. This can be accomplished by the addition of ... Read more
Aluminium matrix reinforced with dispersed TIC and intermetallic AI-Ni particles

Author: Pityana, Sisa L Date: Dec 2011 This work investigates the reinforcement of the aluminium matrix with TiC ceramic and in-situ synthesized AI-Ni intermetallic particles. Read more
Analysis of dry sliding wear performance of tribaloy T-800/Tungsten carbide coating deposited via laser cladding assisted with preheating

Author: Nyadongo, ST ; Olakanmi, EO ; Pityana, Sisa L Date: Oct 2022 Shafts, gears, axles and crankshafts, which are exposed to severe sliding wear environment, are made from wear resistant EN8 medium carbon steel. The wear resistance of EN8 can be enhanced by depositing it with laser cladding assisted with ... Read more
Application of laser assisted cold spraying process for metal deposition

Author: Tlotleng, Monnamme ; Akinlabi, ET ; Shukla, M ; Pityana, Sisa L Date: Feb 2014 Laser assisted cold spraying (LACS) process is a hybrid technique that uses laser and cold spray to deposit solid powders on metal substrates. For bonding to occur, the particle velocities must be supersonic which are achieved by entraining ... Read more
Behaviour of laser metal deposited Ti6Al4V/ Cu composites in Hank’s solution in terms of biocompatibility properties

Author: Erinosho, MF ; Akinlabi, ET ; Pityana, Sisa L Date: 2016 Ti6Al4V alloy is a well-known material for biomedical application due to the very excellent corrosion resistance it possessed. Cu has an excellent antimicrobial property and stabilizes the immune system of the body activities. In this present ... Read more
Bioceramic hydroxyapatite coating fabricated on TI-6Al-4V using Nd:YAG Laser

Author: Tlotleng, Monnamme ; Akinlabi, E ; Shukla, M ; Pityana, Sisa L ; Mathebula, T ; Chauke, Levy Date: Nov 2014 A method of synthesising a biocompatible HAP coating is presented. In the current study, Nd:YAG laser was used to directly melt pre-place HAP powder beds on Ti-6Al-4V. The processing parameters used were 750 W laser power, 5 mm/s scanning ... Read more
CFD model of laser additive manufacturing process of cylinders

Author: Tamsaout, T ; Kheloufi, K ; Amara, EH ; Arthur, Nana KK ; Pityana, Sisa L Date: Nov 2017 A theoretical approach based on a numerical simulation using experimental data is proposed as a contribution to the study of laser-based additive manufacturing by direct energy deposition (DED). The aim is to simulate the stages of layer-by-layer ... Read more
Characteristic effects of alloying elements on ß solidifying titanium aluminides: A review

Author: Raji, Sadiq Abiola ; Popoola, API ; Pityana, Sisa L ; Popoola, OM Date: Jul 2020 The high strength-to-weight ratio property of titanium aluminide (TiAl) based intermetallic alloys makes researchers regard this type of material as a potential replacement for the heavier superalloys of nickel. These alloys have been applied ... Read more
Characteristics of laser In-situ alloyed titanium aluminides coatings

Author: Tlotleng, Monnamme ; Masina, Bathusile N ; Pityana, Sisa L Date: Jan 2017 The use of titanium aluminides as high temperature materials in the aerospace and automobile industries is becoming a reality since their early research and development in 1955. Their mechanical properties at elevated temperatures make them ... Read more
Characterization of laser deposited Ti6Al4V/TiC composite powders on a Ti6Al4V substrate

Author: Mahamood, RM ; Akinlabi, ET ; Shukla, M ; Pityana, Sisa L Date: 2014 This paper reports the material characterization of Ti6Al4V/TiC composite produced by laser metal deposition. The Ti6Al4V/TiC composites were deposited with a composition ratio of 50 wt.% Ti64l4V and 50 wt.% TiC. The depositions were achieved ... Read more
Characterization of laser metal deposited 316L stainless steel

Author: Bayode, A ; Akinlabi, ET ; Pityana, Sisa L Date: Jun 2016 Laser metal deposition (LMD) is an innovative manufacturing technique that uses laser to melt powders to fabricate fully dense components layer by layer. It is capable of processing different metallic powders and can also be used for consolidating ... Read more
Commissioning of laser assisted cold spraying technology

Author: Tlotleng, Monnamme ; Olakanmi, E ; Pityana, Sisa L ; Shukla, M ; Akinlabi, E ; Burger, H ; Meacock, C ; Doyoyo, M Date: Oct 2012 This study demonstrates the potential of a newly designed, assembled and commissioned laser assisted cold spraying (LACS) technology at the National Laser Centre, Pretoria, South Africa, to deposit Al-12wt%Si coatings on stainless steel ... Read more
The comparative study of the microstructural and corrosion behaviour of laser-deposited high entropy alloys

Author: Dada, M ; Popoola, P ; Mathe, Ntombizodwa R ; Pityana, Sisa L ; Adeosun, S ; Aramide, O Date: Jun 2021 Corrosion is a conservational occurrence that has a large economic impact on most metals and its alloys because it destroys and deteriorates most materials by an electrochemical process through the reaction of these materials with the ... Read more
A comparative study on laser processing of commercially available titanium aluminide (TI-48AL-2CR-2NB) and in-situ alloying of titanium aluminide

Author: Hoosain, Shaik E ; Pityana, Sisa L ; Tlotleng, Monnamme ; Legopeng, T Date: Nov 2017 Titanium aluminides (TiAl) are acknowledged as promising high temperature structural materials due to their high melting point, high strength to density, high elastic modulus and high creep strength. Due to their low ductility, it is difficult ... Read more
Computational dynamics of laser alloyed metallic materials for improved corrosion performance: computational dynamics of laser alloyed metallic materials

Author: Fatoba, OS ; Farotade, GA ; Popoola, API ; Pityana, Sisa L Date: Apr 2016 Laser alloying is a material processing method which utilizes the high power density available from defocused laser beam to melt both metal coatings and a part of the underlying substrate. Since melting occur solitary at the surface, large ... Read more
Consolidation mechanism, microstructural evolution and corrosion resistance of Inconel 625 coatings

Author: Olakanmi, EO ; Malikongwa, K ; Nyadongo, ST ; Hoosain, Shaik E ; Pityana, Sisa L Date: Jul 2020 The inter-relationships between geometrical properties, microstructural characteristics and corrosion resistance on one hand and laser-material interaction parameter (a) on the other hand are examined. A laser-material interaction parameter ... Read more
Coupled heat transfer, fluid flow and solidification kinetics for laser additive manufacturing applications

Author: Khomenko, MD ; Makoana, Nkutwane W ; Pityana, Sisa L ; Mirzade, FKH Date: Jul 2021 A new coupled heat transfer and solidification kinetics model is developed for the optimization of microstructure during laser additive manufacturing applications. The Johnson–Mehl–Avrami–Kolmogorov equation is applied in a self-consistent ... Read more
Deposition mechanism and microstructure of laser-assisted cold-sprayed (LACS) Al-12 wt.%Si coatings: effects of laser power

Author: Olakanmi, EO ; Tlotleng, Monnamme ; Meacock, C ; Pityana, Sisa L ; Doyoyo, M Date: Jun 2013 Surface treatment is one of the most costly processes for treating metallic components against corrosion. Laser-assisted cold spray (LACS) has an opportunity to decrease those costs particularly in transportation systems, chemical industries, ... Read more
Effect of energy density on the consolidation mechanism and microstructural evolution of laser cladded functionally-graded composite Ti-Al system

Author: Olakanmi, EO ; Sepako, M ; Morake, J ; Kutua, S ; Hoosain, Shaik E ; Pityana, Sisa L Date: Aug 2018 The engagement of additive manufacturing (AM) technology in developing intermetallic coatings involves additional heat treatment with a view to obtaining desirable microstructure and mechanical properties. This eventually increases the lead ... Read more
Effect of heat treatment on the microstructure, microhardness, and wear characteristics of AlCrFeCuNi high-entropy alloy

Author: Malatji, N ; Lengopeng, T ; Pityana, Sisa L ; Popoola, API Date: Oct 2020 The comprehensive properties exhibited by dual-phase high-entropy alloys (HEA) increase their prospects of finding use in engineering applications. However, the distribution of the phases that are present in the alloys has a significant effect ... Read more

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