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Browsing by Author "Sacks, N"

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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
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
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
Impact toughness of laser alloyed aluminium AA1200 alloys

Author: Mabhali, Luyolo AB ; Pityana, Sisa L ; Sacks, N Date: Aug 2013 Laser surface alloying of aluminium AA1200 was performed with a 4kW Nd:YAG laser and impact resistance of the alloys was investigated. The alloying powders were a mixture of Ni, Ti and SiC in different proportions. Surfaces reinforced with ... Read more
Impact toughness of laser surface alloyed Aluminium

Author: Mabhali, Luyolo AB ; Sacks, N ; Pityana, Sisa L Date: Mar 2012 Laser surface alloying of aluminium AA1200 was performed with a 4kW Nd:YAG laser and the impact resistance of the alloys was investigated. The alloying powders were a mixture of Ni, Ti and SiC in different proportions. Surfaces reinforced ... Read more
Improvement of hardness of aluminium AA1200 by laser surface alloying

Author: Mabhali, Luyolo AB ; Pityana, Sisa L ; Sacks, N Date: Jul 2010 Aluminium is vastly used in industry due to its low cost, light weight and excellent workability, but lacks in wear resistance and hardness. Laser alloying is used to improve the surface properties such as hardness by modifying the composition ... Read more
Improvement of the surface properties of aluminium by the formation of intermetallic phases and metal matrix composites during laser surface alloying

Author: Mabhali, Luyolo AB ; Pityana, Sisa L ; Sacks, N Date: May 2011 Aluminium is widely used in industry due to its low cost, light weight and excellent workability, but is lacking in wear resistance and hardness. Laser alloying is used to improve the surface properties, such as hardness, by modifying the ... 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 alloying of AI with mixed Ni, Ti and SiC powders

Author: Mabhali, Luyolo AB ; Pityana, Sisa L ; Sacks, N Date: Mar 2010 Laser alloying of aluminium AA1200 was performed with a 4.4kW Rofin Sinar Nd:YAG laser to improve the surface hardness. Alloying was carried out by depositing Ni, Ti and SiC powders of different weight ratios on the aluminum substrate. The ... Read more
Laser alloying of Al with mixed Ni, Ti and SiC powders

Author: Mabhali, Luyolo AB ; Pityana, Sisa L ; Sacks, N Date: Nov 2010 Laser alloying of aluminium AA1200 was performed with a 4.4kW Rofin Sinar Nd:YAG laser to improve the surface hardness. Alloying was carried out by depositing Ni, Ti and SiC powders of different weight ratios on the aluminium substrate. The ... Read more
Laser alloying of aluminium to improve surface properties - MSSA 2010

Author: Mabhali, Luyolo AB ; Pityana, Sisa L ; Sacks, N Date: Jul 2010 Aluminium is vastly used in industry due to its low cost, light weight and excellent workability, but lacks in wear resistance and hardness. Laser alloying is used to improve the surface properties such as hardness by modifying the composition ... Read more
Laser surface alloying of aluminum (AA1200) with Ni and SiC Powders

Author: Mabhali, Luyolo AB ; Pityana, Sisa L ; Sacks, N Date: Dec 2010 An Nd:YAG laser was used for surface alloying of aluminum AA1200. The alloying powder was a mixture of Ni and SiC in different ratios. A study of the microstructures obtained after alloying was conducted using optical and scanning electron ... 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
Three body abrasion of laser surface alloyed aluminium AA1200

Author: Mabhali, Luyolo AB ; Sacks, N ; Pityana, Sisa L Date: Jun 2012 Laser surface alloying of aluminium AA1200 was performed with a 4 kW Nd:YAG laser to improve the abrasion wear resistance. Aluminium surfaces reinforced with metal matrix composites and intermetallic phases were achieved. The phases present ... Read more

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Browsing by Author "Sacks, N"

Browsing by Author "Sacks, N"

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