Carbide-free bainitic steels for rail wheel applications

dc.contributor.authorKapito, A.
dc.contributor.authorMostert, Roelf Johannes
dc.contributor.authorStumpf, Waldo E.
dc.contributor.authorSiyasiya, Charles Witness
dc.date.accessioned2020-04-21T14:14:19Z
dc.date.available2020-04-21T14:14:19Z
dc.date.issued2019-09-09
dc.description.abstractIn 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.departmentMaterials Science and Metallurgical Engineeringen_ZA
dc.description.librarianam2020en_ZA
dc.description.sponsorshipWe 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.sponsorshipMintek, the Department of Science and Technology (DST) and Advanced Materials Initiative (AMI)-Ferrous Metals Development Network (FMDN).en_ZA
dc.description.urihttp://iopscience.iop.org/journal/1757-899Xen_ZA
dc.identifier.citationKapito, 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.issn1757-8981 (print)
dc.identifier.issn1757-899X (online)
dc.identifier.other10.1088/1757-899X/655/1/012012
dc.identifier.urihttp://hdl.handle.net/2263/74336
dc.language.isoenen_ZA
dc.publisherIOP Publishingen_ZA
dc.rightsPublished 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.subjectLaboratory alloysen_ZA
dc.subjectForged wheelsen_ZA
dc.subjectAAR Class C steelen_ZA
dc.subjectSouth Africa (SA)en_ZA
dc.subject.otherEngineering, built environment and information technology articles SDG-09
dc.subject.otherSDG-09: Industry, innovation and infrastructure
dc.subject.otherEngineering, built environment and information technology articles SDG-11
dc.subject.otherSDG-11: Sustainable cities and communities
dc.subject.otherEngineering, built environment and information technology articles SDG-12
dc.subject.otherSDG-12: Responsible consumption and production
dc.titleCarbide-free bainitic steels for rail wheel applicationsen_ZA
dc.typeArticleen_ZA

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