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Browsing by Author "Tshabalala, Lerato C"

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Axial fatigue behaviour of additively manufactured tool steels

Author: Tshabalala, Lerato C ; Sono, Oscar JH ; Makoana, Nkutwane W ; Masindi, J ; Maluleke, O ; Johnston, C ; Masete, Mosimanegape S Date: Jun 2020 Tool steels contain high-nickel and low-carbon content, consisting of alloying elements such as Ni, Co, Mo, Ti and Al. These tool steels exhibit excellent mechanical properties combining high strength with good toughness. The aim was to study ... Read more
Characterization of gas atomized Ti-6Al-4V powders for additive manufacturing

Author: Tshabalala, Lerato C ; Mathe, Ntombizodwa R ; Chikwanda, HIlda K Date: May 2018 In this paper, titanium powders from various sources were characterized to compare powder integrity for additive manufacturing by selective laser melting process. Selective laser melting by powder-bed based Additive Manufacturing (AM) is an ... Read more
The effect of porosity on the mechanical properties of Ti-6Al-4V components manufactured by high-power selective laser melting

Author: Mathe, Ntombizodwa R ; Tshabalala, Lerato C ; Hoosain, Shaik ; Motibane, Londiwe P ; Du Plessis, A Date: Jul 2021 Metal powder bed fusion in additive manufacturing is gaining interest as a manufacturing technique for complex metal parts in the aerospace, rail, and automotive industries. This has led to an emergence of 3D printers in the market to accelerate ... Read more
Effect of powder bed preheating on distortion and mechanical properties in high speed selective laser melting

Author: Motibane, Londiwe P ; Tshabalala, Lerato C ; Mathe, Ntombizodwa R ; Hoosain, Shaik E ; Knutsen, RD Date: Oct 2019 Selective Laser Melting (SLM) is known to cause residual stresses due to the inherent large thermal gradients from high heating and cooling rates during manufacturing. The residual stresses tend to induce distortion, delamination of parts ... Read more
The effect of selective laser melting build orientation on the mechanical properties of AlSi10Mg parts

Author: Mfusi, BJ ; Tshabalala, Lerato C ; Popoola, API ; Mathe, Ntombizodwa R Date: Oct 2018 Additive manufacturing is currently applied across a broad material selection and it is growing in production volume and economic impact. Aluminium is one of the materials that play a significant role in the aerospace industry because of its ... Read more
Effects of laser bending on the microstructural constituents

Author: Tshabalala, Lerato C ; Pityana, Sisa L ; Mbaya, R Date: 2012 This article will illustrate the correlation between microstructural and microhardness changes in high-strength-low-alloy steel that occur as a result of laser-bending. Laser bending is a process of bending metal shapes using the laser beam ... Read more
Electropolishing of additively manufactured Ti-6Al-4V surfaces in nontoxic electrolyte solution

Author: Tsoeunyane, GM ; Mathe, Ntombizodwa R ; Tshabalala, Lerato C ; Makhatha, ME Date: May 2022 The reduction of surface roughness on additively manufactured components has become a critical factor in engineering applications. This paper reports the electropolishing of additively manufactured Ti-6Al-4V by powder bed selective laser ... Read more
Industry taking up on-demand additive manufacturing of spare parts

Author: Bester, Duwan C ; Tshabalala, Lerato C Date: Nov 2021 The adoption of Additive manufacturing (AM) in South Africa has grown significantly, with more industries investing and investigating the possibility of adoption to their operations. Some of these industries are the railway and mining industries, ... Read more
Influence of stress relieving thermal cycles on AISI10 Mgspecimens produced by selective laser melting

Author: Mfusi, Busisiwe J ; Mathe, Ntombizodwa R ; Popoola, Patricia A ; Tshabalala, Lerato C Date: Oct 2019 The AlSi10Mg alloy is known for its castability, corrosion resistance, high heat conductivity, low weight and good weldability. The applications of the aluminium alloy components includes heat exchangers that are subjected to high temperatures ... Read more
Investigation of the properties of direct energy deposition additive manufactured 304 stainless steel

Author: Hoosain, SE ; Tshabalala, Lerato C ; Skhosana, Besabakhe S ; Freemantle, C ; Mndebele, N Date: Nov 2021 One of the main considerations in adopting the additive manufacturing (AM) technology is whether the material properties of the AM-produced part are comparable with the wrought material. This study compared the properties of AM-produced 304 ... Read more
LAM additive manufacturing: A fundamental review on mechanical properties, common defects, dominant processing variables, and its applications

Author: Sibisi, TH ; Shongwe, MB ; Tshabalala, Lerato C ; Mathoho, Ipfi Date: Aug 2023 A cutting-edge manufacturing technology that uses powder or wire as the feeding material and a high-energy heating source is known as metal additive manufacturing (AM). High-performance components for automotive, aerospace, medical, and energy ... Read more
Multiphysics simulation of thermal phenomena in direct laser metal powder deposition

Author: Pityana, Sisa L ; Tlotleng, Monnamme ; Tshabalala, Lerato C ; Makoana, Nkutwane W ; Botes, A ; Hachemi Amara, EL Date: Nov 2016 The direct laser metal deposition (DLMD) is a recently developed technique for manufacturing solid parts, layer by layer, directly from powder. The process uses a high power laser beam focused onto a metallic substrate to generate a molten ... Read more
Nanoindentation and corrosion behaviour of 410 stainless steel fabricated via additive manufacturing

Author: Lesufi, M ; Akinwamide, SO ; Makoana, Nkutwane W ; Tshabalala, Lerato C ; Olubambi, PA Date: Sep 2022 This study investigates the microstructural, nanomechanical, and corrosion behaviour of different sections of 410 steel fabricated via directed energy deposition technique. The morphology exhibited by the longitudinal and transverse sections ... Read more
Post processing of Ti6Al4V manufactured using high power laser powder bed fusion

Author: Makoana, Nkutwane W ; Yadroitsava, I ; Tshabalala, Lerato C ; Yadroitsev, I ; Mathoho, Ipfi ; Pityana, Sisa L Date: Sep 2022 To further increase the adoption of additive manufacturing in the industry, it is important to leverage the technology’s potential for serial production to drive down the cost of manufacturing. The use of high-powered laser beam has been ... Read more
Process control & monitoring for laser micromaching of Si3N4 ceramics

Author: Tshabalala, Lerato C ; Pityana, Sisa L ; Styne, J ; Höfer, M ; Schäfer, L Date: Sep 2012 Laser machining which is a non-contact process that offers the advantage of machining advanced ceramics. In laser machining Si3N4, surface temperature is increased and controlled to evaporate the YSiAlON glassy phase of the Si3N4. However, ... Read more
Residual stress, porosity and surface roughness for laser powder bed fusion manufactured Ti6Al4V at high laser powers

Author: Makoana, Nkutwane W ; Yadroitsava, I ; Yadroitsev, I ; Du Plessis, A ; Tshabalala, Lerato C ; Pityana, Sisa L Date: Nov 2021 The use of high-powered lasers presents a unique opportunity to improve the LPBF productivity since a larger beam spot size and higher scanning speeds can be utilized to increase the process build rate. In this study, a custom-built LPBF ... Read more
Sintering behavior and alloying elements effects on the properties of CP-Titanium sintered using pulsed electric current

Author: Jeje, SO ; Shongwe, MB ; Maledi, N ; Ogunmuyiwa, EN ; Tshabalala, Lerato C ; Babalola, BJ ; Olubambi, PA Date: Dec 2020 Mechanical properties of grade 1 commercially pure titanium (CP–Ti) are characterized by a good combination of strength and ductility at elevated temperatures. CP-Ti mechanical properties at room and elevated temperature can be enhanced by ... Read more
Spark plasma sintering of Ti-Ni-TiCN composites: Microstructural characterization, densification and mechanical properties

Author: Rominiyi, AL ; Shongwe, MB ; Tshabalala, Lerato C ; Ogunmuyiwa, EN ; Jeje, SO ; Babalola, BJ ; Olubambi, PA Date: Dec 2020 Ti–Ni–TiCN composites with varying TiCN contents (5, 10 and 15 wt%) were consolidated using the novel spark plasma sintering technique at a sintering temperature of 1100 °C, for 10 min holding time under a vacuum condition of lower than 4 Pa, ... Read more
Spheroidisation of stainless steel powder for additive manufacturing

Author: Chikosha, Silethelwe ; Tshabalala, Lerato C ; Bissett, H ; Lesufi, M ; Mnguni, Khulekani N ; Motsai, Tebogo M ; Manama, T ; Hoosain, S Date: Jun 2021 In additive manufacturing, powder characteristics play an important role in terms of flowability and densification, which can be improved by the use of spherical powders. In this study, irregular powder was spheroidised by plasma treatment, ... Read more
Standard method for microCT-based additive manufacturing quality control 1: Porosity analysis

Author: Du Plessis, A ; Sperling, P ; Beerlink, A ; Tshabalala, Lerato C ; Hoosain, Shaik E ; Mathe, Ntombizodwa R ; Le Roux, SG Date: Sep 2018 MicroCT is a well-established technique that is used to analyze the interior of objects non-destructively, and it is especially useful for void or porosity analysis. Besides its widespread use, few standards exist and none for additive ... Read more

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