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Browsing by Author "Arthur, Nana KK"

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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
Comparison of in situ alloyed Ti-6Al-4V+10Mo via selective laser melting and directed energy deposition

Author: Madikizela, C ; Cornish, LA ; Chown, LH ; Möller, H ; Arthur, Nana KK Date: Nov 2017 In situ alloying is an important topic for alloy development and improvement of mechanical properties in additive manufacturing. With the scarcity of getting most commercial titanium alloys in powder form, development and qualification of ... Read more
The effect of laser shock processing on the anti-corrosion performance of LENS-Fabricated Ti-6Al-4V alloy

Author: Arthur, Nana KK ; Kubjane, SM ; Popoola, API ; Masina, Bathusile N ; Pityana, Sisa L Date: May 2023 Titanium alloys are prone to increased oxidation rates when exposed to higher temperatures during application. As a result, the components suffer mechanical failure due to the formation of the alpha-case layer at 500 °C. To improve its corrosion ... Read more
Effect of LSP parameters on the corrosion and hardness properties of TI6Al4V

Author: Kubjane, SM ; Arthur, Nana KK ; Masina, Bathusile N ; Popoola, API ; Pityana, Sisa L Date: Sep 2019 Because of its low density, high corrosion resistance and high strength to weight ratio, titanium and its alloys are widely used in aerospace applications. As a result, the material is exposed to detrimental environment. An enhancement in ... 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
Evaluation of hatch distance and powder feed rate effects in TI-6AL-4V alloy developed by LMD technique

Author: Sibisi, PN ; Popoola, API ; Arthur, Nana KK ; Kubjane, SM ; Ngoveni, AS ; Kanyane, LR Date: Nov 2018 Laser metal deposition provides various benefits over traditional manufacturing, and has since become the research hotspot, as demand for advanced manufacturing persists. The effects of process parameter variation on structural integrity and ... 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
Impact of DED process parameters on the metallurgical characteristicsof 17-4 PH SS deposited using DEDI

Author: Mathoho, I ; Akinlabi, ET ; Arthur, Nana KK ; Tlotleng, Monnamme Date: Aug 2020 This study investigated the influence direct energy deposition (DED) process parameters have on the metallurgical characteristics (porosity, microstructural evolution, microhardness, and corrosion behavior) of 17−4 PH stainless steel powder. ... Read more
Influence of Mo on microstructure and nanoindentation hardness of Ti-Al-Si-xMo alloy processed by Laser Engineered Net Shaping (LENS)

Author: Raji, SA ; Pityana, Sisa L ; Popoola, API ; Popoola, OM ; Arthur, Nana KK ; Tlotleng, Monnamme Date: Oct 2021 In this work, the microstructure and nanoindentation hardness properties of Ti-Al-Si-xMo alloys produced through laser in-situ alloying using laser engineered net shaping (LENS) technology were investigated. The microstructures and phases ... Read more
Influence of process parameters on layer build-up and microstructure of Ti6Al4V (ELI) alloy on the optomec LENS

Author: Arthur, Nana KK ; Malabi, Khorommbi P ; Baloyi, Pincuss ; Moller, H ; Pityana, Sisa L Date: Nov 2016 The Optomec Laser Engineered Net Shaping (LENS®) system is a laser-based platform that relies on computer-aided design (CAD) files to design and produce 3D printed components. This system is comprised of a 1 kW laser used to melt metal powders ... Read more
Investigation and optimization of heat treatment process on tensile behaviour of Ti6Al4V alloy

Author: Omoniyi, PO ; Mahamood, RM ; Arthur, Nana KK ; Pityana, Sisa L ; Akinlabi, SA ; Okamoto, Y ; Maina, MR ; Akinlabi, ET Date: Oct 2021 This article examines the microstructure and tensile strength of annealed Ti6Al4V alloy at different temperatures and times. Taguchi based L9 (32) design was used for the experimental design matrix and optimization of the tensile strength of ... Read more
Investigation of the mechanical and microstructural properties of TIG welded Ti6Al4V alloy

Author: Omoniyi, PO ; Mahamood, RM ; Arthur, Nana KK ; Pityana, Sisa L ; Akinlabi, SA ; Hassan, S ; Okamoto, Y ; Maina, MR ; Akinlabi, ET Date: Jul 2021 The joint integrity of 1 mm thick sheets of Ti6Al4V alloy welded autogenously using TIG welding was investigated in this article. The current and gas flow rate were varied and their effects on the mechanical properties and microstructure of ... Read more
Joint integrity evaluation of laser beam welded additive manufactured Ti6Al4V sheets

Author: Omoniyi, PO ; Mahamood, RM ; Arthur, Nana KK ; Pityana, Sisa L ; Skhosane, Besabakhe S ; Okamoto, Y ; Shinonaga, T ; Maina, MR ; Jen, TC ; Akinlabi, ET Date: Mar 2022 The feasibility of joining laser metal deposited Ti6Al4V sheets using laser beam welding was investigated in this article. The additive manufactured sheets were joined using a 3 kW CW YLS-2000-TR ytterbium laser system. The mechanical properties ... Read more
Laser based manufacturing of Ti6Al4V: A comparison of LENS and selective laser melting

Author: Arthur, Nana KK Date: Apr 2019 The laser engineered net shaping (LENS) system was used for the laser based manufacturing of a test geometry used to assess the performance of additive manufacturing systems. This system was preferred over a selective laser melting (SLM) ... Read more
Laser butt welding of thin Ti6Al4V sheets: Effects of welding parameters

Author: Omoniyi, P ; Mahamood, R ; Arthur, Nana KK ; Pityana, Sisa L ; Skhosane, Besabakhe S ; Okamoto, Y ; Shinonaga, T ; Maina, M ; Jen, T-C ; Akinlabi, E Date: Sep 2021 Titanium and its alloys, particularly Ti6Al4V, which is widely utilized in the marine and aerospace industries, have played a vital role in different manufacturing industries. An efficient and cost-effective way of joining this metal is by ... Read more
Laser metal deposition of functionally graded Ti-6Al-4V + Mo samples and characterization studies

Author: Kumpaty, S ; Coen, B ; Coen, L ; Tlotleng, Monnamme ; Arthur, Nana KK ; Pityana, Sisa L Date: Nov 2021 Ti-6Al-4V is a common alloy known for its use in aerospace and/or biomedical applications. In this study, Mo has been employed to increase the biocompatibility of Ti-6Al-4V. Two samples of Ti-6Al-4V with layers of differing percentages of Mo ... Read more
Material characteristics of Ti-6AL-4V samples additively manufactured using laser-based direct energy deposition

Author: Willemse, MG ; Siyasiya, CW ; Marais, D ; Venter, AM ; Arthur, Nana KK Date: Feb 2023 Although additive manufacturing is fast gaining traction in the industrial world as a reputable manufacturing technique to complement traditional mechanical machining, it still has problems such as porosity and residual stresses in components ... Read more
Metallurgical characteristics of laser peened 17-4 PH SS processed by LENS technique

Author: Mathoho, Ipfi ; Akinlabi, ET ; Arthur, Nana KK ; Tlotleng, Monnamme ; Masina, Bathusile N Date: Mar 2019 This study investigated the effect of laser peening on the surface integrity (surface roughness, microstructure and microhardness) of 17-4 PH stainless steel components which were built through the direct energy deposition (DED). Additive ... Read more
Microstructural characterization of additively manufactured Ti-6Al-4V with the addition of ß-Stabilizer, niobium

Author: Mrwata, K ; Siyasiya, C ; Arthur, Nana KK Date: Nov 2023 This study investigated the influence of beta stabilizer niobium on the microstructure and hardness of Ti-6Al-4V. The relationship between increased the concentration of alloying elements into Ti-6Al-4V is generally associated with an increase ... Read more
Microstructural effects on properties of as-fabricated Inconel 625 with direct energy deposition process

Author: Booysen, TN ; Jamiru, T ; Adegbola, T ; Arthur, Nana KK Date: Nov 2023 Three-dimensional printing (3D), also known as metal additive manufacturing (MAM), fabricates parts or components from different feedstocks: wires, powders or sheets. This process differs from traditional manufacturing techniques such as ... Read more

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