Browsing Research Articles (Materials Science and Metallurgical Engineering) by Author "Stumpf, Waldo E."
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Browsing Research Articles (Materials Science and Metallurgical Engineering) by Author "Stumpf, Waldo E."
Now showing items 1-20 of 27
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Swanepoel, D.B.; Stumpf, Waldo E. (Maney, 2009-12)Hulamin Rolled Products (Ltd) developed a high Mn and Si containing alloy, EN 4017 as a scrap consuming alloy from the waste generated in producing their range of clad products for brazing of inter alia automotive heat ...
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Bauristhene, A.M.; Mutombo, Kalenda; Stumpf, Waldo E. (Southern African Institute of Mining and Metallurgy, 2013-04)Ti-64, which accounts for more than 50% of the worldwide titanium tonnage, has found commercial importance in industries requiring components with high specific strength and resistance to corrosion. Investment casting ...
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Moller, Heinrich; Govender, Gonasagren; Stumpf, Waldo E. (Elsevier, 2010-09)The conventional casting alloy A356 is probably one of the most popular alloys used for semi-solid metal (SSM) forming. This is due to its high fluidity and good castability. This alloy can be heat treated alternatively ...
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Annan, Kofi Ahomkah; Stumpf, Waldo E. (Iron and Steel Institute of Japan, 2018-02-15)Please read abstract in the article.
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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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Characteristics of martensite as a function of the Ms temperature in low-carbon armour steel plates Maweja, Kasonde; Stumpf, Waldo E.; Van der Berg, Nic (Nicolaas George) (Elsevier, 2009)The microstructure, morphology, crystal structure and surface relief of martensite in a number of experimental armour steel plates with different Ms temperatures were analysed. Atomic force microscopy, thin foil transmission ...
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Moller, Heinrich; Govender, Gonasagren; Stumpf, Waldo E.; Pistorius, Petrus Christiaan (Maney, 2010)The heat treatment response of semisolid metal high pressure die cast Al–7Si–Mg alloys A356 and F357 was studied and compared. It was found that the heat treatment behaviour of alloy F357 is influenced markedly by the ...
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Moller, Heinrich; Govender, Gonasagren; Stumpf, Waldo E. (Trans Tech, 2011-06)Semi-solid metal high pressure die casting was used to produce plates from traditional wrought Al-Mg-Si alloys 6082 and 6004, as well as from traditional casting Al-Si-Mg alloys A356 and F357. The high Si-content of the ...
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Siyasiya, Charles Witness; Stumpf, Waldo E. (Springer, 2015-01)Please read abstract in the article.
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Maweja, Kasonde; Stumpf, Waldo E. (Elsevier, 2008-08)Neither a higher hardness nor higher mechanical properties (yield strength, ultimate tensile strength, impact energy, and %elongation) appear to be exclusive or even reliable criteria for predicting the ballistic performance ...
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Maumela, M.; Stumpf, Waldo E.; Siyasiya, Charles Witness (IOP Publishing, 2019-11-09)The influence of the individual equiaxed and columnar cast structure on the evolution of texture during thermo-mechanical processes (TMP) was investigated using the electron backscatter diffraction (EBSD) technique. The ...
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Tang, Zhenghua; Stumpf, Waldo E. (Elsevier, 2008)In a hot rolled Nb–Ti and a Nb–Ti–0.09%Mo micro-alloyed steel, the ratio of yield strength to tensile strength (YS/UTS) was found to be a function of the microstructure and cooling rate in those tests where no coiling ...
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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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Nkhoma, Richard K.C.; Siyasiya, Charles Witness; Stumpf, Waldo E. (Elsevier, 2014-05)Although the austenitic stainless steels 304 and 321 are often treated nominally as equivalents in their hot rolling characteristics, the question remains whether any subtle differences between the two allow further ...
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Moller, Heinrich; Stumpf, Waldo E.; Pistorius, Petrus Christiaan (Elsevier, 2010-09)The microstructures and tensile properties of semi-solid metal high pressure die cast (SSM-HPDC) F357 alloys with low and high levels of Fe, Ni and Cr were compared in different temper conditions. ThermoCalc software was ...
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Annan, Kofi Ahomkah; Siyasiya, Charles Witness; Stumpf, Waldo E. (Southern African Institute of Mining and Metallurgy, 2015-10)The relationship between niobium content and austenite grain growth has been investigated through hot rolling simulation on a Bähr dilatometer. The effect of delay time between passes during rough rolling in Nbmicroall ...
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Moller, Heinrich; Govender, Gonasagren; Rossouw, Pierre; Stumpf, Waldo E. (Hindawi Publishing Corporation, 2011)Alloy A356 is one of the most popular alloys used for semisolid metal forming. The heat treatment cycles that are currently applied to semisolid processed components are mostly those that are in use for dendritic casting ...
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Moller, Heinrich; Govender, Gonasagren; Stumpf, Waldo E.; Knutsen, R.D. (Maney, 2009-03)The microstructures and mechanical properties of strontium modified semisolid metal high pressure die cast A356 alloy are presented. The alloy A356-F (as cast) has a globular primary grain structure containing a fine ...
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Uananisa, H.J.; Siyasiya, Charles Witness; Stumpf, Waldo E.; Papo, M.J. (Southern African Institute of Mining and Metallurgy, 2015-10)The need to reduce weight while maintaining good mechanical properties in materials used in the automotive industry has over the years seen an increased exploitation of various steels to meet this new demand. In line with ...
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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 ...
Now showing items 1-20 of 27