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Browsing by Author "Theron, Maritha"

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Crack mitigation in laser engineered net shaping of WC-10wt%FeCr cemented carbides

Author: Molobi, E ; Sacks, N ; Theron, Maritha Date: Apr 2022 Laser engineered net shaping of a WC-10wt%FeCr cemented carbide showed cracking during deposition despite using a full factorial design of experiments matrix along with single and multiple objective optimization models to establish an optimal ... Read more
CW ND:YAG laser welding of dissimilar sheet metals

Author: Theron, Maritha ; Van Rooyen, Corney ; Ivanchev, LH Date: Oct 2007 A 4kW CW Nd:YAG laser was used for lap welding of three different dissimilar sheet metal combinations, namely 316L S/S - Ti64, 316L S/S - Al 5251 and Al 1200 – Cu (99.85%). A welding matrix of laser power, travel speed and spot sizes was ... Read more
Directed energy deposition of a cemented tungsten carbide rotary burr prototype

Author: Molobi, E ; Sacks, N ; Theron, Maritha Date: Nov 2021 In this study a cemented tungsten carbide rotary burr prototype was fabricated using directed energy deposition based on an optimal parameter set which was previously derived from a full factorial design of experiments matrix approach. Finite ... Read more
Effect of heat treatment on the properties of laser-beam welded rheo-cast F357 aluminum

Author: Theron, Maritha ; Knutsen, RD ; Ivanchev, LH ; Burger, HP Date: Feb 2012 Semi-solid metal rheo-cast F357 aluminum plates were joined by autogenous Nd:YAG laser welding and were welded in either the as-cast (F) condition, T4 temper or T6 temper condition. The weldability of this age-hardenable Al–7%Si–0.6%Mg casting ... Read more
Feasibility of using laser enabled net shaping to manufacture WC-Fe alloys

Author: Molobi, E ; Sacks, N ; Theron, Maritha Date: Oct 2018 Laser Enabled Net Shaping technology in the manufacture of cemented tungsten carbides is challenging and many scientific gaps still need to be addressed to ensure commercial viability. In this study the feasibility of using LENS® to produce ... Read more
Framework for cemented tungsten carbide drill bit prototype fabrication using laser engineered net shaping

Author: Davoren, B ; Sacks, N ; Theron, Maritha Date: Nov 2021 The interest in additive manufacturing and its unique applications has increased significantly over recent years. This has resulted in the need for alloys and composites to be optimized for these processes. In this study a multiphase parameter ... 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 z-increment on the build height, porosity and microstructure of laser deposited WC-10wt%FeCr thin walls

Author: Molobi, E ; Sacks, N ; Theron, Maritha Date: Oct 2021 The influence of z-increment on profile, porosity and microstructure of WC-10wt%FeCr single walls deposited using direct energy deposition was studied. Traverse speeds of 3.2 and 6.4 mm/s were used, while laser power was varied at 200, 300 ... 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 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
Local heat treatment of a laser build-up

Author: Theron, Maritha ; Van Rooyen, Corney ; Malabi, Khorommbi P ; Hoosain, Shaik E Date: 2019 Laser cladding or laser metal deposition involves the deposition of any weldable material onto the surface of a metal substrate by means of a laser beam. Although clad deposits are fully fusion-joined to the substrate material, the very low ... Read more
Microstructure characterization of WC-9.2wt%Monel 400 fabricated using laser engineered net shaping using laser engineered net shaping

Author: Davoren, B ; Sacks, N ; Theron, Maritha Date: Jun 2021 To assess if a WC-9.2wt%Monel 400 alloy properties could be improved using LENS, one alloy was deposited onto a heated substrate and a second alloy was subjected to laser remelting of the final deposited layer. Microstructural characterization ... Read more

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Browsing by Author "Theron, Maritha"

Browsing by Author "Theron, Maritha"

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