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  Design of high-strength and damage-resistant carbide-free fine bainitic steels for railway crossing applications

Kumar, A., Makineni, S. K., Dutta, A., Goulas, C., Steenbergen, M. J., Petrov, R., et al. (2019). Design of high-strength and damage-resistant carbide-free fine bainitic steels for railway crossing applications. Materials Science and Engineering A: Structural Materials Properties Microstructure and Processing, 759, 210-223. doi:10.1016/j.msea.2019.05.043.

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 Creators:
Kumar, Ankit1, 2, Author              
Makineni, Surendra Kumar3, Author              
Dutta, Aniruddha4, Author              
Goulas, Constantinos5, Author              
Steenbergen, Michaël J.M.M.6, Author
Petrov, Roumen7, 8, Author              
Sietsma, Jilt8, 9, Author              
Affiliations:
1Materials Science of Mechanical Contracts, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_2324693              
2Department of Materials Science and Engineering, Delft University of Technology, Mekelweg 2, Delft 2628 CD, The Netherlands, ou_persistent22              
3Atom Probe Tomography, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863384              
4Mechanism-based Alloy Design, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863383              
5Delft University of Technology, Department of Materials Science and Engineering, Mekelweg 2, 2628CD Delft, The Netherlands, ou_persistent22              
6Delft University of Technology, Section of Railway Engineering, Faculty of Civil Engineering and Geosciences, Stevinweg 1, 2628 CN, Delft, the Netherlands, ou_persistent22              
7Delft University of Technology, Department of Materials Science and Engineering, Mekelweg 2, CD Delft, Netherlands, ou_persistent22              
8Ghent University, Department of Materials Science and Engineering,Tech Lane Ghent Science, Park-Campus A, Technologiepark 903 Zwijnaarde, Ghent, Belgium, ou_persistent22              
9Technische Universiteit Delft, Mekelweg 5, 2628 CD Delft, The Netherlands, ou_persistent22              

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Free keywords: Austenite; Bainite; Bainitic transformations; Carbides; Carbon; Ferrite; High resolution transmission electron microscopy; Mechanical properties; Mechanical stability; Microstructure; Probes; Railroads; Rails; Steel metallography; Strain; Thin films; Transmission electron microscopy, Atom-probe tomography; Bainitic microstructures; Bainitic steel; Cementite precipitation; Digital image correlations; Rail crossings; Strain partitioning; Strengthening mechanisms, High strength steel
 Abstract: A novel high-strength steel design is proposed, with a fine bainitic microstructure free from inter-lath carbides, for railway crossings applications. The design is based on the phase transformation theory and avoids microstructural constituents like martensite, cementite and large blocky retained austenite islands in the microstructure which are considered to be responsible for strain partitioning and damage initiation. The designed steel consists of fine bainitic ferrite, thin film austenite and a minor fraction of blocky austenite which contribute to its high strength, appreciable toughness and damage resistance. Atom probe tomography and dilatometry results are used to study the deviation of carbon partitioning in retained austenite and bainitic ferrite fractions from the T0/T0 ʹ predictions. A high carbon concentration of 7.9 at. (1.8 wt) was measured in thin film austenite, which governs its mechanical stability. Various strengthening mechanisms such as effect of grain size, nano-sized cementite precipitation and Cottrell atmosphere at dislocations within bainitic ferrite are discussed. Mechanical properties of the designed steel are found to be superior to those of conventional steels used in railway crossings. The designed steel also offers controlled crack growth under the impact fatigue, which is the main cause of failure in crossings. In-situ testing using micro digital image correlation is carried out to study the micromechanical response of the designed microstructure. The results show uniform strain distribution with low standard deviation of 1.5 from the mean local strain value of 7.7 at 8 global strain. © 2019 Elsevier B.V.

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Language(s): eng - English
 Dates: 2019-06-24
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1016/j.msea.2019.05.043
 Degree: -

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Title: Materials Science and Engineering A: Structural Materials Properties Microstructure and Processing
  Abbreviation : Mater. Sci. Eng. A: Struct. Mater. Prop. Microstruct. Process.
Source Genre: Journal
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Affiliations:
Publ. Info: Amsterdam : Elsevier B.V.
Pages: - Volume / Issue: 759 Sequence Number: - Start / End Page: 210 - 223 Identifier: ISSN: 0921-5093
CoNE: https://pure.mpg.de/cone/journals/resource/954928498465_1