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Browsing by Author "Tlotleng, Monnamme"

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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
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
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
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
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
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 heat treatment on microstructure, hardness and tensile properties of high-speed selective laser melted Ti6Al4V

Author: Lekoadi, Paul M ; Tlotleng, Monnamme ; Annan, K ; Maledi, N ; Masina, Bathusile N Date: Nov 2022 This study presents the investigation of the influence of heat treatment on microstructure, hardness and tensile properties of high-speed selective laser melted Ti6Al4V components. Heat treatment was performed to obtain an improved microstructure ... Read more
Effect of in-situ heat treatment and process parameters on the laser-deposited IN718 microstructure and mechanical properties

Author: Masina, Bathusile N ; Skhosane, Besabakhe S ; Tlotleng, Monnamme Date: 2020 The direct laser-deposited Inconel 718 (IN718) specimens were produced using 1073 nm, high power continuous wave (CW), IPG Ytterbium fibre laser and in-situ heat treatment. The laser power and in-situ heat treatment temperature were fixed ... 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
Effects of A1 and heat treatment on the microstructure and hardness of Ti-A1 synthesized via in situ melting using LENS

Author: Tlotleng, Monnamme Date: May 2019 Producing alloys via in-situ laser alloying approach is becoming very easy and a topical issue in the field of laser additive manufacturing. Several studies have emerged, accompanied by a statement by Gasper et al. (2017), who reported the ... Read more
Effects of heat-treatment on the microstructure of TiAl-Nb produced with laser metal deposition technique

Author: Tlotleng, Monnamme ; Lengopeng, Thabo ; Seerane, Mandy N ; Pityana, Sisa L Date: Oct 2017 Ti and its intermetallic alloys are light-weight and have good creep properties. Materials of this nature are desired for the manufacturing of parts for the aerospace, automotive and power plants. Titanium aluminides, in particular, are ... Read more
Effects of laser power during laser assisted cold spraying of Al-12wt%Si on stainless steel

Author: Tlotleng, Monnamme ; Olakanmi, E ; Pityana, Sisa L ; Shukla, M ; Akinlabi, E Date: Oct 2012 This study seeks to demonstrate Laser Assisted Cold Spraying (LACS) by depositing Al-12wt%Si on stainless steel substrate. LACS is a newly designed, assembled and commissioned technology in the CSIR, laser materials processing laboratories. ... Read more
The effects of LENS process parameters on the behaviour of 17-4 PH stainless steel

Author: Mathoho, Ipfi ; Akinlabi, ET ; Arthur, Nana KK ; Tlotleng, Monnamme ; Makoana, Nkutwane W Date: Feb 2020 17-4 PH stainless steel has proven to be one of the workhorse materials in industries such as aerospace, chemical, and energy. The attraction of this alloy to the aforementioned industries is derived from the fact that 17-4 PH stainless steel ... Read more
Effects of niobium (Nb) on mechanical properties of laser coated Nitinol (NiTi) used for surface modification of Ti6Al4V alloy

Author: Skhosane, Besabakhe S ; Tlotleng, Monnamme ; Pityana, Sisa L Date: Mar 2020 Laser surface treatment is widely used as an engineering technique due to its special characteristics and several advantages over other surface modification techniques. In the present study, elemental mechanically pre-alloyed powder consisting ... Read more
Effects of substrate heating on the microstructure and hardness of TiB/Ti6Al4V-ELI during laser in-situ metal deposition

Author: Lekoadi, Paul M ; Tlotleng, Monnamme ; Masina, Bathusile N Date: Dec 2021 This work investigated the influence of heating temperature (°C) on the microstructure and microhardness of TiB/Ti6Al4V-ELI composite clads that were produced via in-situ alloying using laser metal deposition technique. The samples were ... Read more
Evaluation of heat treatment parameters on microstructure and hardness properties of high-speed selective laser melted Ti6Al4V

Author: Lekoadi, Paul M ; Tlotleng, Monnamme ; Annan, K ; Maledi, N ; Masina, Bathusile N Date: Feb 2021 This study presents the investigation on how heat treatment parameters, which are temperature, cooling method, and residence time, influence the microstructural and hardness properties of Ti6Al4V components produced on Ti6Al4V substrate using ... Read more
Evaluation of microstructure and micro-hardness of 410L SS coatings fabricated using laser assisted cold spraying: process development

Author: Mathebula, TE ; Tlotleng, Monnamme ; Malabi, Khorommbi P ; Pityana, Sisa L ; Camagu, S Date: Nov 2014 Automotive, marine, power generation, petrochemical and mining industries experience problems which results in huge financial constraints due to damage of the engineering components. Sometimes the components are exposed to aggressive, corrosive, ... Read more
Evaluation of single tracks of 17-4PH steel manufactured at different power densities and scanning speeds by selective laser melting

Author: Moller, Hein ; Burger, Herman ; Tlotleng, Monnamme ; Yadroitsev, I ; Makoana, Nkutwane W Date: Nov 2016 In Selective Laser Melting, the initial units produced are single tracks that overlap to create a single layer; from the sequence of layers, a 3D object is manufactured. The properties of the parts produced by SLM depend heavily on the ... Read more c b
Evaluation of the microstructure and microhardness of laser-fabricated titanium aluminate coatings

Author: Tlotleng, Monnamme ; Lengopeng, T ; Pityana, Sisa L Date: Oct 2016 Titanium aluminide intermetallics are very brittle at room temperature, hence they are challenging to fabricate even by conventional manufacturing techniques such as casting and forging. The production of TiAl from elemental powders using ... Read more
Heat treatment response and characterization of Ti6Al4V + xMo produced by laser metal deposition

Author: Arthur, Nana KK ; Siyasiya, CW ; Pityana, Sisa L ; Tlotleng, Monnamme Date: Jan 2022 During the laser metal deposition additive manufacturing processing of Ti6Al4V ELI alloy, the parts produced were exposed to high levels of thermal gradients, which resulted from rapid heating and cooling rates in the material. This had an ... Read more

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