Browsing Research Articles (Materials Science and Metallurgical Engineering) by UP Author "Mostert, Roelf Johannes"
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Browsing Research Articles (Materials Science and Metallurgical Engineering) by UP Author "Mostert, Roelf Johannes"
Now showing items 1-20 of 30
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Kapito, A.; Mostert, Roelf Johannes; Stumpf, Waldo E.; Siyasiya, Charles Witness (IOP Publishing, 2019-09-09)In South Africa, forged wheels for rail cars are imported but cast wheels are manufactured locally, although recent developments indicate that forged wheels will in future be manufactured locally. The forged wheels are ...
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Mathabathe, Maria Ntsoaki; Bolokang, A.S.; Govender, G.; Siyasiya, Charles Witness; Mostert, Roelf Johannes (Elsevier, 2019-12)Beta (β) solidifying γ-TiAl intermetallic alloys of nominal composition Ti-48Al, Ti-48Al-2Nb, Ti-48Al-2Nb-0.7Cr alloys have been cold pressed and vacuum arc melted. The Al loss was due to compaction method used prior to ...
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Pretorius, Christiaan C.E.; Mostert, Roelf Johannes; Ramjee, Shatish (Southern African Institute of Mining and Metallurgy, 2021-04)The study investigates the effect of prior corrosive exposure on crack growth resistance behaviour of thin sheet (3 mm thick) aluminium alloy 2024-T3 at slow strain rates. Compact tension specimens were exposed to standard ...
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Mathabathe, Maria Ntsoaki; Bolokang, A.S.; Govender, G.; Siyasiya, Charles Witness; Mostert, Roelf Johannes (Southern African Institute of Mining and Metallurgy, 2021-04)The b-solidifying g-TiAl intermetallic alloys of nominal composition Ti-48Al (binary alloy), Ti-48Al-2Nb (ternary alloy), Ti-48Al-2Nb-0.7Cr (quaternary alloy), and Ti-48Al-2Nb-0.7Cr-0.3Si (quinary alloy) (in at.%) were ...
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Mukarati, T.W.; Mostert, Roelf Johannes; Siyasiya, Charles Witness (IOP Publishing, 2019)The strain hardening behaviour of AISI 301 metastable austenite steel was analysed by evaluating tensile data against the empirical mathematical equations of Hollomon, Ludwik and Ludwigson. It was found that these equations ...
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Mukarati, T.W.; Mostert, Roelf Johannes; Siyasiya, Charles Witness (IOP Publishing, 2018)Martensitic transformation, either athermal or strain-induced, in metastable AISI 301 austenitic steel is of high technical interest as this facilitates manipulation of mechanical properties. This work is part of a project ...
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Mathabathe, Maria Ntsoaki; Bolokang, A.S.; Govender, G.; Siyasiya, Charles Witness; Mostert, Roelf Johannes (IOP Publishing, 2019-11-09)Electron backscattered diffraction (EBSD) has been conducted to determine the orientation relationship of the remnant B2 phase in an -solidified -Ti-45Al-2Nb-0.3Si (at. %) based intermetallic alloy. The morphology and ...
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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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Kambilinya, P.I.; Siyasiya, Charles Witness; Banks, K.M. (Kevin); Mostert, Roelf Johannes (IOP Publishing, 2019-09-09)A homogeneous microstructure is required for consistent mechanical properties in normalised Nb-Ti-V microalloyed plate steels. Frequently, as-hot rolled microalloyed plate steels have a banded microstructure that is ...
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Effect of solution aggressiveness on the crack growth resistance and cracking mechanism of AA2024-T3 Charalampidou, Christina Margarita; Pretorius, Christiaan C.E.; Mostert, Roelf Johannes; Alexopoulos, Nikolaos D. (NACE International, 2021-09)Aluminum alloy 2024-T3 was examined using a range of microscopy techniques at the early stages of corrosion attack to investigate the corrosion-induced cracking mechanism. Two different corrosive environments—exfoliation ...
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Kurup, Vinod; Siyasiya, Charles Witness; Mostert, Roelf Johannes (IOP Publishing, 2019-11-09)A steel of composition Fe-0.2C-3Mn-2Si-0.5Al was fully austenized followed by a quench and partitioning heat treatment process (Q&P). The quench temperature was varied, which resulted in different volume fractions of ...
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Leso, Tshenolo Phinah; Siyasiya, Charles Witness; Mostert, R.J. (Roelf); Moema, Joseph (Taylor and Francis, 2023)Wear and rolling contact fatigue (RCF) are major causes of delays and unavailability of rail systems. The presence of lubricants at the rail and wheel interface influences wear and RCF. Lubricants include naturally occurring ...
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Chalimba, Stephen Akonda; Mostert, Roelf Johannes; Stumpf, Waldo E.; Siyasiya, Charles Witness; Banks, K.M. (Kevin) (Springer, 2017-11)Please read abstract in the article.
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Leso, Tshenolo Phinah; Siyasiya, Charles Witness; Mostert, Roelf Johannes; Moema, J. (Southern African Institute for Industrial Engineering, 2022-11-11)A train experiences different slip ratios at the wheel/rail contact point as it moves along the rail track, which influences the rolling contact fatigue (RCF) and wear properties of wheel and rail materials. This variation ...
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Annan, Kofi Ahomkah; Njoroge, Eric Gitau; Siyasiya, Charles Witness; Mostert, Roelf Johannes (Elsevier, 2021-01)A fifty litre seamless gas cylinder manufactured from a 34CrMo4 low carbon alloy steel which was in service for five years failed in an unexpected manner, causing severe damage. The cylinder was filled with a mixture of ...
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Annan, Kofi Ahomkah; Nkhoma, Richard; Siyasiya, Charles Witness; Mostert, Roelf Johannes (Elsevier, 2022)Thin-walled Al-Si alloy precision casting components are used for various applications due to their excellent castability, corrosion resistance as well as high strength to weight ratio. It is very difficult to achieve all ...
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Kurup, Vinod; Siyasiya, Charles Witness; Mostert, Roelf Johannes; Wicks, J. (IOP Publishing, 2018)The effect of full and partial austenitization on the microstructural evolution of a medium carbon steel with 2.2 mass %Si was studied during the quench and partitioning heat treatment process. The quench and partition ...
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Pretorius, Christiaan C.E.; Mostert, Roelf Johannes; Mukarati, Tulani W.; Mathoho, Vhutshilo M. (Suid-Afrikaanse Akademie vir Wetenskap en Kuns, 2021)In the refining industry, steels can be susceptible to a damage mechanism known as high temperature hydrogen attack (HTHA). The detection of damage in such structures through non-destructive testing (NDT) requires insight ...
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Chalimba, Stephen Akonda; Mostert, Roelf Johannes; Stumpf, Waldo E.; Siyasiya, Charles Witness; Banks, K.M. (Kevin) (Springer, 2020-01)A simple mathematical model has been developed which describes the flow curve behavior up to the peak true stress or a true strain of 0.6 in unstable austenite. The hot working behavior was analyzed by compression tests ...
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Mukarati, Tulani W.; Mostert, Roelf Johannes; Siyasiya, Charles Witness (Wiley, 2022-05)Please abstract in the article.
Now showing items 1-20 of 30