Browsing Masters by Department "Centre for Materials Engineering"

Now showing items 1-20 of 111

Abrasion-corrosion and stress corrosion resistance of a 9Cr-2Ni-0.7Mo steel in simulated mine water

Author: Gatzanis, Gustav Ernest Date: 1991 The locally (RSA) developed 9Cr-2Ni-0.7Mo steel designated 927 formed the subject of this study. Its abrasion-corrosion and stress corrosion performances were assessed in laboratory tests simulating the underground environment in South African ... Read more
The abrasive wear resistance of austempered spheroidal graphite irons

Author: Shepperson, S V Date: 1987 A study has been made of the structure and abrasive wear resistance of two austempered commercial spheroidal cast irons. Heat treatments have been carried out for different times between 2 and 120 minutes for a range of austenitising temperatures ... Read more
Abrasive wear resistance of ruthenium aluminide intermetallic and ferritic steels containing a sigma intermetallic phase

Author: Ngakane, M Date: 1998 The abrasive wear resistance of ruthenium aluminide intermetallic and ferritic steel containing an iron-chrome sigma intermetallic phase have been investigated in this study. A medium carbon wear resistant steel (MCV) was used in the study ... Read more
Abrasive wear testing of steels in soil

Author: Quirke, SJ Date: 1987 A survey has been made of the quality and type of materials used for tillage tools in South Africa. Conclusions have been drawn regarding the inadequacy of the manufacturing processes used and the resultant quality of the tool material. A rig ... Read more
An abrasive-corrosive wear evaluation of some aluminium alloys

Author: Meyer-Rödenbeck, G D Date: 1989 This investigation evaluates the abrasive-corrosive wear behaviour of aluminium alloys with the aim of establishing a data base of performance and guide lines for material optimisation. Wear test apparatus and standard tests developed by ... Read more
Adsorption of oxygen molecules on platinum surfaces modified with subsurface atoms of vanadium : a DFT study

Author: Matengaifa, R Date: 2014 The aim of this work was to investigate changes in the electronic structure of platinum as a result of alloying with vanadium, and the effects of these changes on O2 adsorption. This is important for the further development of hydrogen fuel ... Read more
Analysis of phase transformations in hydrogenated titanium metals by non-isothermal dilatometry

Author: Abbas, Naseeba Date: 2011 Hydrogen was used as a temporary alloying element in CP Ti and Ti-6AI-4V. The microstructural evolution and phase transformations were monitored, before, during and after hydrogenation with in-situ dilatometric testing. Wrought CP Ti and ... Read more
An assessment of polymeric materials and surface treated steels as cavitation erosion resistant materials

Author: Barletta, A Date: 1983 The object of the research described in this thesis was to optimise the choice of materials used for vital components of hydraulic machinery. Frequently these components are damaged by a process known as cavitation erosion and the operation ... Read more
Assessment of the corrosion behaviour of alloys 825 and 625 in stagnant seawater-effect of temperature and welding

Author: Chicuba, Pedro Claudio Francisco Date: 2017 Alloy 825 has been extensively used as a cladding alloy in the gas and oil industry for process piping up to and including the manifolds, separators, wellheads, risers and valves. The outstanding corrosion resistance of alloy 825 against ... Read more
Cavitation erosion of WC-Co

Author: Hankey, S E Date: 1987 An investigation involving the vibratory cavitation erosion of WC-Co alloys was undertaken in order to determine the mechanisms of material removal. Nineteen grades of WC-Co alloys were studied. These alloys had been previously characterised ... Read more
Characterisation and refinement of properties of glass fibre reinforced polyester polymer concrete for use in manhole components

Author: Griffiths, Robert Date: 1999 The aim of this investigation is to characterise and refine the physical properties of glass fibre reinforced polyester polymer concrete. This material is currently being employed by AV Mouldings (Pty) Ltd. to manufacture manhole and drain ... Read more
A comparative evaluation of manufacturing technologies and their effect on morphology and mechanical properties of poly-(propylene-ethylene) copolymers

Author: Sello, Maitse P Date: 2002 This project is a technological benchmark exercise for Sasol Polymers where different poly (propylene-ethylene) copolymer grades from five foremost licensed manufacturing PP technologies are evaluated. These copolymer grades were manufactured ... Read more
A constitutional study of a dual phase steel containing 12% chromium

Author: Schaffer, G B Date: 1983 This thesis involved a study of the phase transfonnations in a chromium containing corrosion resistant dual phase steel, designated 3CR12. The objectives included the detennination of time-temperature-transformation (TTT) diagrams for the ... Read more
Continuum Damage Mechanics (CDM) modelling of dislocation creep in 9-12% Cr creep resistant steels

Author: Stracey, Muhammad Ghalib Date: 2016 The generation of electricity to meet an ever-growing demand has become a defining characteristic of the modern world for both developed and developing nations alike. This, coupled with the intensifying concern with pollution and its effects ... Read more
Critical analysis of simulated thermomechanical processing of aluminium can body stock

Author: Hyde, Chase Kennedy Date: 2015 Hot Plane Strain Compression (PSC) testing is a thermomechanical testing method used to simulate the deformation condition of industrial rolling. Thermomechanical processing (TMP) factors such as the amount of strain, strain rate and temperature ... Read more
Degradation of the beta-alumina electrolyte in a zebra cell

Author: Van Heerden, D P Date: 1988 Beta-alumina solid electrolytes studied were subjected to charge and discharge cycles in a secondary, high energy density Na/beta-alumina/NaAlCl₄/FeCl₂ cell (known as the Zebra cell) at 250⁰ C. These electrolytes were studied by means of ... Read more
Development of high performance and efficient coating repair systems for offshore tropical marine environment

Author: Agostinho, Francisco José Date: 2018 Rehabilitation coatings of offshore equipment rarely perform as well as the original coating, despite the high cost involved. The performance gap is probably due to high relative humidity, salt contamination and limitations on the use of ... Read more
Development of low cost thermal insulating materials

Author: Meletse, Thabo Frans Date: 2005 The disadvantaged people in South Africa are unfortunate by virtue of their financial status. It was estimated in 1992 that 20 % of the South African population live in informal settlements. The houses in these settlements are found to be ... Read more
Development of the small punch test platform to evaluate the embrittlement of power plant materials

Author: Tshamano, Lavhelesani Oliet Date: 2017 Life assessment of critical components and piping is performed in the electrical power plants in order to prevent structural/component failure and prolong safe operation of the equipment. In the event that these components fail, the consequences ... Read more
Discovering novel platinum structures

Author: Mabunda, Khanyisa Prudence Date: 2013 The Pt[8]Zr ordering transformation in Pt 11 at. % Zr alloys has been studied. The study included determination of the formation of the Pt[8]Zr phase and its order/disorder transformation temperature (Tc). Electron diffraction patterns and ... Read more