Browsing Research Articles (Materials Science and Metallurgical Engineering) by UP Author "Coetsee, Theresa"
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Browsing Research Articles (Materials Science and Metallurgical Engineering) by UP Author "Coetsee, Theresa"
Now showing items 1-20 of 23
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Coetsee, Theresa; De Bruin, Frederik (MDPI, 2022-05)Nickel alloying of carbon steel is used to enhance steel strength and toughness. Nickel alloying of the weld metal via solid weld wire presents several difficulties as highlighted previously, such as work hardening of ...
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Coetsee, Theresa; De Bruin, Frederik (MDPI, 2022-02-24)Al assisted alloying of carbon steel in Submerged Arc Welding (SAW) by Al-Cr-Ti-Cu unconstrained metal powders is applied. A base case without metal powder additions is compared to two metal powder addition schedules, ...
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Coetsee, Theresa; De Bruin, Frederik (MDPI, 2022-11-02)Unconstrained metal powders of chromium and nickel, in combination with aluminium, were used in the submerged arc welding (SAW) process to simplify weld metal alloying. Unconstrained metal powders refer to non-alloyed ...
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Coetsee, Theresa; De Bruin, Frederik (MDPI, 2022-08-25)The application of cobalt and aluminium powders in unconstrained format, not as metal powder in tubular wire nor as pre-alloyed powder, is used in this work to simplify weld metal alloying. The objective of this study ...
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Coetsee, Theresa; De Bruin, Frederik (MDPI, 2022-02-01)In submerged arc welding (SAW) of chromium containing steels, the chromium in the weld metal is usually sourced from weld wire. Manufacturing of precise weld wire compositions for alloying of the weld metal is expensive. ...
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Coetsee, Theresa; Mostert, Roelf Johannes; Pistorius, Pieter Georg Hendrik; Pistorius, Petrus Christiaan (Elsevier, 2021-03)Post-weld slag and weld metal analyses were used to interpret the effects of different commercial flux compositions on element transfer between molten flux (slag) and weld metal in Submerged Arc Welding (SAW). Selected ...
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The effect of processing parameters on ferromanganese alloy carbon content in Mamatwan ore reduction Coetsee, Theresa (Taylor and Francis, 2017-01)Industrial production of medium carbon ferromanganese is accomplished by decarburization of high carbon ferromanganese in an oxygen blown converter. In this study, the possible in situ refinement of high carbon ferromanganese ...
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Coetsee, Theresa; De Bruin, Frederik (MDPI, 2022-05-11)Flux formulations are specified to target chemical and physico-chemical parameters. Chemical parameters set flux element transfer behaviours and weld metal oxygen contents. Physicochemical parameters such as slag viscosity, ...
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Coetsee, Theresa; De Bruin, Frederik (MDPI, 2022-10-31)Chromium alloying of weld metal is usually accomplished via weld wire. This is done because chromium has a high affinity for oxygen and is therefore not easily transferred across the arc. The formation chromium (VI) is one ...
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Coetsee, Theresa; De Bruin, Frederik (Wiley, 2024-05)Please read abstract in the article.
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Coetsee, Theresa; De Bruin, Frederik (Elsevier, 2024-05)The submerged arc welding (SAW) process is complex because multi-phase reactions occur simultaneously across a large temperature interval from 2500 °C in the arc cavity, down to the weld pool liquidus temperare at the ...
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Coetsee, Theresa; Pistorius, Petrus Christiaan (Maney, 2009)An experimental configuration was developed to quantify the rate of heat transfer into an iron ore– carbon mixture during one-dimensional radiative heating. Repeatability and accuracy were evaluated by comparing the results ...
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Coetsee, Theresa (Taylor and Francis, 2018-04)The SAF (submerged arc furnace) process is most widely used for industrial production of high carbon ferromanganese. Most plants use ore feed in the form of lump ore (−75 mm +6 mm), but long term supply is limited, and ...
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Coetsee, Theresa; De Bruin, Frederik (MDPI, 2022-11-19)Aluminium metal is avoided as main reactant in submerged arc welding (SAW) because it is easily oxidised in this process. Aluminium is an effective de-oxidiser and can be used to prevent Cr and Co loss to the slag by ...
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Coetsee, Theresa; De Bruin, Frederik (Elsevier, 2024-03)Nano-strands form in fluoride-based slag during submerged arc welding (SAW) due to the re-condensation of gas species formed at high temperatures in the arc cavity. The SAW process is complex due to gas-slag-metal reactions ...
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Coetsee, Theresa; De Bruin, Frederik (MDPI, 2024-07)Please read abstract in the article.
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Coetsee, Theresa (Elsevier, 2020-09)Please read abstract in the article.
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Serwale, Matsie Rinny; Coetsee, Theresa; Fazluddin, S. (Southern African Institute of Mining and Metallurgy, 2020-05)The CSIR is developing a process to produce commercially pure (CP) Grade 4 titanium metal powder via direct metallothermic reduction of TiCl4. Crude titanium produced by this method is inevitably contaminated with unreacted ...
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Serwale, M.R.; Coetsee, Theresa; Sole, Kathryn C.; Fazluddin, S. (Southern African Institute of Mining and Metallurgy, 2022-12)The CSIR-Ti process employs lithiothermic reduction of titanium tetrachloride feedstock to produce titanium sponge. The product is therefore contaminated by a range of lithium and chloride species. In this study we examine ...
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Coetsee, Theresa; Pistorius, Petrus Christiaan (Maney, 2009)Packed beds of coal and iron ore (mostly in the size range 425–850 mm) were heated by thermal radiation to the bed surface, to test possible rate determining steps, the effect of coal volatiles, and whether the previously ...
Now showing items 1-20 of 23