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Theses and Dissertations (Materials Science and Metallurgical Engineering): Recent submissions
Now showing items 41-60 of 163
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(University of Pretoria, 2018)A series of single compression tests were performed in order to improve the understanding of the influence of processing parameters (temperature, strain and strain rate) on the hot deformation behaviour of 2304 LDSS. The ...
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(University of Pretoria, 2018)The thermo-mechanical processing of microalloyed steels has been studied widely. However most of the work has been focused on the finishing stages of hot rolling where pancaking of the austenite is desired for strength and ...
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(University of Pretoria, 2017)Low pressure gas carburising (LPGC) or vacuum carburising is a heat treatment process used in the aerospace and automotive industries to surface harden low alloy steel parts with carbon in the range of 0.1 to 0.25%. This ...
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(University of Pretoria, 2017)It is widely known that the addition of vanadium carbide to tungsten carbide significantly enhances the performance of the tungsten carbide tool by improving the hardness as well as the abrasion resistance of the material. ...
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(University of Pretoria, 2018)Industrial electrowinning of nickel requires specific control and optimisation of the electrolyte composition, the presence of impurities, the addition of additives (to achieve particular deposit properties) and the operating ...
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(University of Pretoria, 2017)The ballistic performance was investigated with rigorous testing of the new armor steel alloy, a tempered variant and a benchmark material. Mechanical testing included Hopkinson pressure bar tests, high temperature, notched ...
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(University of Pretoria, 2017)The depletion of high-grade lump ore and increased blast furnace productivity with the use of prepared burden have resulted in increased use of iron ore sinter and pellets. There is considerable interest in including fine ...
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(University of Pretoria, 2017)Ferritic stainless steels (FSSs) are gaining popularity because they are cheaper than austenitic stainless steels (ASS) since they contain almost no nickel. Amongst these FSSs, there is a relatively new grade of steel ...
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(University of Pretoria, 2016)The feasibility of in-situ alloying of AISI 410L martensitic stainless steel with nitrogen during Nd-YAG laser cladding was investigated with the aim of achieving a nitrogen content of at least 0.08 wt% and fully martensitic ...
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(University of Pretoria, 2016)The uranium price decline has negatively impacted on the uranium mining industry. This decline in price requires that uranium metallurgical processes be made to operate more efficiently. Some key parameters that influence ...
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(University of Pretoria, 2017)The movement of particles inside a jig ultimately determines the efficiency of the jig. The movement of these particles is a function of the particle properties (size, density and shape) and the jigging parameters (pulse ...
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(University of Pretoria, 2014)PGM concentrates contain more than just the platinum group minerals. They also concentrate three minerals pyrrhotite (Fe1 xS), pentlandite ([Fe,Ni]9S8) and chalcopyrite (CuFeS2). In a sample of Merensky concentrate tested ...
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(University of Pretoria, 2017)Plain C-Mn steels such as SA-516 Grade 65 are used as steam lines to transport high temperature steam under pressure. Plain carbon steels that are in service at elevated temperatures (typically 400-450°C) for prolonged ...
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(University of Pretoria, 2017)Hot strip mills (HSM) are used to roll cast slabs down from their initial size to plate or sheet, which is then used to manufacture a wide variety of goods for many industrial markets. The working rolls that contact and ...
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(University of Pretoria, 2015)The feasibility of producing Direct Reduced Iron from cold-bonded self-reducing composite pellets made from Anglo American Kumba Iron Ore Sishen upgraded slimes was considered on laboratory scale. Composite pellets were ...
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(University of Pretoria, 2016)Cobalt-based catalysts are currently being used in the Fischer-Tropsch synthesis (FTS) process. These catalysts however deactivate with time on stream. Sintering has been identified as one of the most significant deactivation ...
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(University of Pretoria, 2016)Biooxidation is an attractive process for unlocking of gold from refractory ores, but could be further improved by reducing the rather high cyanide consumption during the cyanidation of the biooxidation residues. The high ...
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(University of Pretoria, 2015)Standard material analysis methods used in the heavy minerals industry to characterise spiral separation behaviour is unable to fully quantify performance differences between the available spiral profiles of today. This ...
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(University of Pretoria, 2015)Low carbon ferrochrome is a primary alloying element in the production of stainless steel. The Mixing Method (Perrin and Duplex) processes are most commonly used for the production thereof. However, during the cocktailing ...
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(University of Pretoria, 2015)Type 441 stainless steel (EN 1.4509 or UNS S43940) is a low carbon dual-stabilised ferritic grade with a nominal chromium content of 18%. This steel displays high corrosion and oxidation resistance, good formability, ...
Now showing items 41-60 of 163