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Browsing by Subject "Laser cladding"

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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
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
CSIR annual report 2015

Author: CSIR Date: 2015 The CSIR annual report publishes for the year 2015. 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 laser scanning speed on surface properties of Ti-Si laser clad intermetallic coatings fabricated on Ti-6Al-4V alloy

Author: Phala, MF ; Popoola, API ; Tlotleng, Monnamme ; Pityana, Sisa L Date: 2018 A binary Ti-Si (1 : 1) alloy coating was fabricated on Ti-6Al-4V alloy using laser cladding technique where Neodymium yttrium aluminium garnet laser was utilised. Micro-atomised powders of Ti and Si were used for deposition of multi-track ... Read more
Experimental investigation on the influence of laser power and scan speed on track geometry in direct laser cladding of al – carbides powder composites on steel substrate

Author: Elkoussy, A ; Youssef, AF ; Pityana, Sisa L ; Taha, MA Date: 2019 Coating steel surfaces with hard ceramic particles in Aluminum has a great influence to improve mechanical properties and wear resistance. This research investigated direct laser deposition, where no binder is used, of pure Aluminum and its ... Read more
In-situ crack repair by laser cladding

Author: Van Rooyen, Corney ; Burger, H ; Theron, Maritha ; Doubell, P Date: Sep 2010 Laser cladding crack repair of austenitic stainless steel vessels subjected to internal water pressure was evaluated. The purpose of this investigation was to develop process parameters for in-situ repair of through-wall cracks in components ... Read more
Influence of extra chromium addition on the microstructure, hardness, and corrosion behaviour of high carbon ferrochrome FeCrV15 deposited through laser cladding on steel baseplate for tillage application

Author: Aramide, B ; Popoola, P ; Sadiku, R ; Jamiru, T ; Pityana, Sisa L Date: Nov 2021 Laser cladding is an additive manufacturing technology utilised in surface strengthening, modification, and repair of components subjected to adverse working conditions, such as tillage tools, which is accomplished by adding functionally ... Read more
Influence of vanadium-chromium carbide on the microstructure of reinforced FeCrV15 hardfacing

Author: Aramide, B ; Pityana, Sisa L ; Jamiru, T ; Popoola, P ; Sadiku, R Date: Aug 2021 The increasing manufacturing technologies are a crucial aspect of industrialization. Laser additive manufacturing is the process of manufacturing using laser (heat) technology to manufacture components from scratch and or strengthening and ... Read more
Influence of ZrB2 addition on microstructural development and microhardness of Ti-SiC clad coatings on Ti6Al4V substrate

Author: Farotade, GA ; Popoola, AP ; Pityana, Sisa L Date: Aug 2017 The 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
Laser based refurbishment of steel mill components

Author: Kazadi, P ; Van Rooyen, Corney ; Burger, H Date: Mar 2006 Laser refurbishment capabilities were demonstrated and promising results were obtained for repair of distance sleeves, foot rolls, descaler cassette, idler rolls. Based on the cost projections and the results of the in-situ testing, components ... Read more
Laser cladding - a modern joining technique

Author: Bolokang, Amogelang S ; Mathabathe, Maria N Date: Apr 2021 The shroud shelve life of turbine blades depends on wear resistance. Thus, the wear of blade shroud shelves’ contact area ascertains the overall service life of gas turbine engines (GTE). Moreover, research shows that the life service of ... Read more
Laser cladding crack repair of austenitic stainless steel

Author: Van Rooyen, Corney ; Burger, H ; Theron, Maritha Date: Jun 2009 Laser cladding crack repair of austenitic stainless steel vessels subjected to internal water pressure was evaluated. The purpose of this investigation was to develop process parameters for in-situ repair of through-wall cracks in components ... Read more
Laser cladding of aluminium using TiB2

Author: Kumar, S ; Pityana, Sisa L Date: Mar 2010 Modification of Aluminium surface by injecting, dispersing and melting TiB2 powder with the help of a laser beam promises to enhance tribological properties of Aluminium. The present work consists of making single lines and various overlapping ... Read more
Laser cladding process development for high carbon steel substrates

Author: Lengopeng, T ; Botes, A ; Popoola, API Date: Nov 2014 This paper evaluates the effect of process parameters (laser power and scanning velocity) on clad layer height, heat affected zone (HAZ) width, metallurgical bonding to base metal and Vickers microhardness profiles of clad layers of various ... Read more
Laser enabled refurbishment and performance enhancement of industrial components

Author: Van Rooyen, Corney ; Theron, Maritha ; Burger, HP Date: Sep 2011 This presentation highlights the case for refurbishment/performance enhancement of industrial components in South Africa. There is potential to improve operational efficiency and reduce operating cost provided that techno-economically viable ... Read more
Microhardness and wear behaviour of surface modified Ti6Al4V/Zr-TiC metal matrix composite for advanced material

Author: Popoola, API ; Ochonogor, OF ; Abdulwahab, M ; Pityana, Sisa L ; Meacock, C Date: Dec 2012 Surface modification of titanium alloy (Ti-6Al-4V) was made using a Rofin Sinar 4 kW Nd: YAG laser. A laser multi-track 50% overlapping process was employed to produce Zr and Zr-TiC metal matrix composite (MMC) coatings on Ti6Al4V substrate. ... Read more
Microstructural development during laser cladding of low-C martensitic stainless steel.

Author: Van Rooyen, Corney Date: Jul 2007 Heat input plays an important role in the microstructural development of 12%Cr martensitic stainless steel. The microstructure of low-C 12%Cr martensitic stainless steel resulting from laser cladding was investigated. For 410L a ferritic ... Read more
Microstructure and microhardness characterization of Cp-Ti/SiAlON composite coatings on Ti-6Al-4V by laser cladding

Author: Sibisi, PN ; Popoola, API ; Kanyane, LR ; Fatoba, OS ; Adesina, OS ; Arthur, Nana KK ; Pityana, Sisa L Date: Mar 2019 Failure 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

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