dc.contributor.author |
Kapito, A.
|
|
dc.contributor.author |
Mostert, Roelf Johannes
|
|
dc.contributor.author |
Stumpf, Waldo E.
|
|
dc.contributor.author |
Siyasiya, Charles Witness
|
|
dc.date.accessioned |
2020-04-21T14:14:19Z |
|
dc.date.available |
2020-04-21T14:14:19Z |
|
dc.date.issued |
2019-09-09 |
|
dc.description.abstract |
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 generally manufactured from AAR Class C steel,
which is a high carbon, pearlitic steel used for rail application. Railway wheels are a costly
component of the railway wagon as they experience wear and damage during application.
Improvements in the mechanical properties are thus desired. Against this background, a project
is reported on the development of durable rail steel alloys for railway wheel applications.
Carbide-free bainite is a novel microstructure comprising bainitic ferrite and retained
austenite/martensite but without coarse carbides in the interlath positions. The absence of
carbides is achieved through the addition of a high silicon (~2wt%) content to the steel. This
carbide-free bainite can achieve high tensile strength (>1000MPa) and toughness (40J, 20°C) as
well as good wear resistance. These alloys have found application in areas where high strength,
toughness and wear resistance are required, such as in rail steels, and have been deemed the “next
generation” of rail steels.
Carbide-free experimental alloys were produced in the laboratory and tested for mechanical
properties such as hardness, tensile strength and impact toughness. The properties of the
laboratory alloys were compared to those of standard Class C alloys used in South Africa to
determine their potential use as railway wheel alloys. |
en_ZA |
dc.description.department |
Materials Science and Metallurgical Engineering |
en_ZA |
dc.description.librarian |
am2020 |
en_ZA |
dc.description.sponsorship |
We would like to thank the following people and organisations, without which this study would not have
been possible: the University of Pretoria for providing technical support and academic supervision,
Mintek, for technical and financial support, The Department of Science and Technology (DST),
Advanced Materials Initiative (AMI)-Ferrous Metals Development Network (FMDN) for their financial
support, the Nelson Mandela University, Department of Physics and Centre for HRTEM for
transmission kikuchi diffraction (TKD) analysis and the Nuclear Energy Council for South Africa
(NECSA) for their neutron diffraction analysis. |
en_ZA |
dc.description.sponsorship |
Mintek, the Department of Science and Technology (DST) and Advanced Materials Initiative (AMI)-Ferrous Metals Development Network (FMDN). |
en_ZA |
dc.description.uri |
http://iopscience.iop.org/journal/1757-899X |
en_ZA |
dc.identifier.citation |
Kapito, A., Mostert, R.J., Stumpf, W.E. et al. 2019, 'Carbide-free bainitic steels for rail wheel applications', IOP Conference Series: Materials Science and Engineering, vol. 655, art. 012012, pp. 1-13. |
en_ZA |
dc.identifier.issn |
1757-8981 (print) |
|
dc.identifier.issn |
1757-899X (online) |
|
dc.identifier.other |
10.1088/1757-899X/655/1/012012 |
|
dc.identifier.uri |
http://hdl.handle.net/2263/74336 |
|
dc.language.iso |
en |
en_ZA |
dc.publisher |
IOP Publishing |
en_ZA |
dc.rights |
Published under licence by IOP Publishing Ltd. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. |
en_ZA |
dc.subject |
Laboratory alloys |
en_ZA |
dc.subject |
Forged wheels |
en_ZA |
dc.subject |
AAR Class C steel |
en_ZA |
dc.subject |
South Africa (SA) |
en_ZA |
dc.title |
Carbide-free bainitic steels for rail wheel applications |
en_ZA |
dc.type |
Article |
en_ZA |