• The vacuum melted ɣ-TiAl (Nb, Cr, Si)-doped alloys and their cyclic oxidation properties 

  Mathabathe, M.N.; Bolokang, A.S.; Govender, S.; Mostert, R.J. (Roelf); Siyasiya, Charles Witness (Elsevier, 2018-08)

  The γ-TiAl intermetallic alloy doped with Nb, Cr, and Si metals has been developed. It has emerged that the ternary Ti-48Al-2Nb and quinary Ti-48Al-2Nb-0.7Cr-0.3Si alloys yielded the best mechanical and cyclic oxidation ...
• Phase transformation and microstructural control of the α-solidifying γ-Ti-45Al-2Nb-0.7Cr-0.3Si intermetallic alloy 

  Mathabathe, M.N.; Govender, S.; Bolokang, A.S.; Mostert, R.J. (Roelf); Siyasiya, Charles Witness (Elsevier, 2018-08)

  The γ-Ti-45Al-2Nb-0.7Cr-0.3Si based intermetallic alloy was developed. Microstructure evolution of the as-cast and heat-treated alloy yielded the spheriodised and Widmanstätten laths. High temperature differential thermal ...
• Identifying critical parameters in the settling of African kimberlites 

  Boshoff, E.T.; Morkel, Jacqueline; Naude, Natasia (Taylor and Francis, 2018)

  Kimberlite is the host rock of diamonds and varies widely in geological and mineralogical features as well as color, processing capability, and dewatering characteristics. This study investigated the dewatering behavior ...
• Upgrade of SLon concentrate with the use of froth flotation on a typical African iron ore 

  Kruger, M.; Naik, S.; Naude, Natasia (Taylor and Francis, 2018)

  This study focus on the upgrading of SLon concentrates, of a complex African iron ore, with the aid of flotation. Mineralogical studies indicated that the +38µm material was not liberated and required milling prior to ...
• MnO reduction in high carbon ferromanganese production: practice and theory 

  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 ...
• 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 ...
• Modeling of work hardening during hot rolling of vanadium and niobium microalloyed steels in the low temperature austenite region 

  Chalimba, S.A. (Stephen Akonda); Mostert, R.J. (Roelf); Stumpf, Waldo E.; Siyasiya, Charles Witness; Banks, K.M. (Kevin) (Springer, 2017-11)

  This work extends the application of the well-established Estrin and Mecking (EM) work-hardening model in unstable low temperature austenite region. The interaction between work hardening, recovery and softening attributed ...
• How to sustain mineral resources : beneficiation and mineral engineering opportunities 

  De Villiers, J.P.R. (Johan) (Mineralogical Society of America, 2017-10)

  The sustainability of a mineral resource depends, among other aspects, on what the mineral in question will be used for, price fluctuations, future resource requirements, and downstream manufacturing. A balance must be ...
• Roughing of thick, coarse-grained high-temperature-processing steels processed via compact strip production 

  Banks, K.M. (Kevin); Tuling, Alison; Maubane, Dannis Rorisang Nkarapa (Iron and Steel Institute of Japan, 2017)

  The roughing conditions required to avoid local heterogeneous regions in the final microstructure of high temperature processing (HTP) Nb linepipe steels have been investigated for quasi-compact strip production (CSP) ...
• Effects of roughing on finish rolling simulations in microalloyed strip steels 

  Chalimba, S.A. (Stephen Akonda); Mostert, R.J. (Roelf); Stumpf, Waldo E.; Siyasiya, Charles Witness; Banks, K.M. (Kevin) (Springer, 2017-11)

  Please read abstract in the article.
• Influence of a carboxymethyl cellulose (CMC) binder on the mechanical properties of iron ore pellets 

  Van der Merwe, M.C.J.; Garbers-Craig, Andrie Mariana (Southern African Institute of Mining and Metallurgy, 2017-04)

  Carboxymethyl cellulose is an organic binder used in the iron ore pelletizing industry. The basic principles of how carboxymethyl cellulose (CMC) solutions behave during the pelletizing process and how these principles ...
• The effect of coating parameters and annealing on the crushing strength of TRISO coated particles 

  Hancke, J.J.; Van Rooyen, Gerrit T.; De Villiers, J.P.R. (Johan) (American Nuclear Society, 2013-04)

  The crushing strength (load at fracture) of coated particles was measured by compression between soft metal anvils. The method requires no sample preparation and can be used as a quality control method as well as a valuable ...
• Repair welding of carbon steel that has been partially graphitized during service 

  Kruger, K.J.; Pistorius, P.G.H.; Orsmond C.P.M. (Springer, 2017-06)

  Plain carbon steels that are in service at elevated temperatures (typically 400-450 °C) for prolonged periods of time (typically in excess of 20 years) may experience graphitization, often in the heat affected zone (HAZ). ...
• Refinement of iron ore sinter phases : a silico-ferrite of calcium and aluminium (SFCA) and an Al-free SFC, and the effect on phase quantification by X-ray diffraction 

  Liles, David C.; De Villiers, J.P.R. (Johan); Kahlenberg, Volker (Springer, 2016-02)

  Crystals of a silico-ferrite of calcium and aluminium (SFCA) and an Al-free SFC were prepared from the melt by slow cooling of synthetically prepared mixtures and examined by single-crystal diffraction methods. Both ...
• Control of silica polymerisation during ferromanganese slag sulphuric acid digestion and water leaching 

  Kazadi, Dieudonne M.; Groot, D.R.; Steenkamp, J.D. (Joalet Dalene); Pöllmann, H. (Elsevier Science Limited, 2016-12)

  A major obstacle to the hydrometallurgical treatment of ferromanganese slags is the way in which silica polymerisation is controlled during sulphuric acid digestion and water leaching. In an acidic medium, silica enters ...
• The influence of particle size distribution on the properties of metal-injection-moulded 17-4 PH stainless steel 

  Seerane, M.; Ndlangamandla, P.; Machaka, R. (Southern African Institute of Mining and Metallurgy, 2016-10)

  Metal injection moulding (MIM) is a near-net-shaping powder metallurgy technique suitable for the cost-effective mass production of small and complex components. In this paper, the effects of the metal powder particle size ...
• Laves phase embrittlement of the ferritic stainless steel type AISI 441 

  Sello, M.P.; Stumpf, Waldo E. (Elsevier, 2010-07)

  The effect of Laves phase (Fe2Nb) formation on the Charpy impact toughness of the ferritic stainless steel type AISI 441 was investigated. The steel exhibited good room temperature toughness after solution treatment ...
• Laves phase precipitation and its transformation kinetics in the ferritic stainless steel type AISI 441 

  Sello, M.P.; Stumpf, Waldo E. (Elsevier, 2011-01)

  Electrolytic extraction followed by XRD analysis of precipitates after isothermal annealing of an AISI 441 ferritic stainless steel between 600 and 850 ◦C produced the time–temperature–precipitation (TTP) diagram for the ...
• Sintering behavior of TiO2-supported model cobalt Fischer-tropsch catalysts under H2 reducing conditions and elevated temperature 

  Xaba, B.M.; De Villiers, J.P.R. (Johan) (American Chemical Society, 2016-09)

  The sintering of model TiO2-supported cobalt catalysts has been studied. The TiO2 supports used were anatase, P25 (85% anatase-15% rutile) and rutile. The catalysts were characterized at each stage of treatment. ...
• β-alumina-14H and β-alumina-21R : two chromic Na2-δ(Al,Mg,Cr)17O25 polysomes observed in slags from the production of low-carbon ferrochromium 

  Hejny, Clivia; Kahlenberg, Volker; Schmidmair, Daniela; Tribus, Martina; De Villiers, J.P.R. (Johan) (Elsevier, 2016-09)

  The crystal structures of unknown phases found in slags from the production of low-carbon ferrochromium were studied by powder and single-crystal X-ray diffraction. Two phases of Na2−δ (Al, Mg, Cr)17O25 composition were ...

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