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  Microstructural evolution of white and brown etching layers in pearlitic rail steels

Kumar, A., Agarwal, G., Petrov, R., Goto, S., Sietsma, J., & Herbig, M. (2019). Microstructural evolution of white and brown etching layers in pearlitic rail steels. Acta Materialia, 171, 48-64. doi:10.1016/j.actamat.2019.04.012.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-ACE6-8 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-ACE7-7
Genre: Journal Article

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 Creators:
Kumar, Ankit1, 2, Author              
Agarwal, Gautam3, Author              
Petrov, Roumen4, 5, Author              
Goto, Shoji6, Author              
Sietsma, Jilt5, 7, Author              
Herbig, Michael8, Author              
Affiliations:
1Delft University of Technology, Department of Materials Science and Engineering, Mekelweg 2, 2628CD, Delft, the Netherlands, ou_persistent22              
2Materials Science of Mechanical Contracts, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_2324693              
3Delft University of Technology, Department of Materials Science and Engineering, Mekelweg 2, 2628CD, Delft, The Netherlands, ou_persistent22              
4Delft University of Technology, Department of Materials Science and Engineering, Mekelweg 2, CD Delft, Netherlands, ou_persistent22              
5Ghent University, Department of Materials Science and Engineering,Tech Lane Ghent Science, Park-Campus A, Technologiepark 903 Zwijnaarde, Ghent, Belgium, ou_persistent22              
6Akita University, Tegata Gakuencho, Akita 010-8502, Japan, ou_persistent22              
7Technische Universiteit Delft, Mekelweg 5, 2628 CD Delft, The Netherlands, ou_persistent22              
8Materials Science of Mechanical Contacts, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_2324693              

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Free keywords: Austenite; Carbides; Etching; Martensite; Microalloyed steel; Microcracks; Pearlite; Rails; Vehicle wheels, Atom-probe tomography; Electron back scatter diffraction; Electron channeling contrasts; Pearlitic rail steels; White etching layer (WEL) and Brown etching layer (BEL), Microstructural evolution
 Abstract: The formation of White (WEL) and Brown Etching Layers (BEL) on rail raceways during service causes the initiation of microcracks which finally leads to failure. Detailed characterization of the WEL and the BEL in a pearlitic rail steel is carried out from micrometer to atomic scale to understand their microstructural evolution. A microstructural gradient is observed along the rail depth including martensite, austenite and partially dissolved parent cementite in the WEL and tempered martensite, ultrafine/nanocrystalline martensite/austenite, carbon saturated ferrite and partially dissolved parent cementite in the BEL. Plastic deformation in combination with a temperature rise during wheel-rail contact was found to be responsible for the initial formation and further microstructural evolution of these layers. The presence of austenite in the WEL/BEL proves experimentally that temperatures rise into the austenite range during wheel-rail contact. This is in agreement with finite element modelling results. Each wheel-rail contact must be considered as an individual short but intense deformation and heat treatment cycle that cumulatively forms the final microstructure, as shown by diffusion length calculations of C and Mn. The presence of secondary carbides in the BEL indicates that the temperature in the BEL during individual loading cycles reaches levels where martensite tempering occurs. Partially fragmented primary cementite laths, enriched in Mn, depleted in Si, and surrounded by a C-gradient and dislocations were found in the BEL. The initial step in the formation of BEL and WEL is the defect- and diffusion-assisted decomposition of the original microstructure. © 2019 Acta Materialia Inc.

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Language(s): eng - English
 Dates: 2019-04-092019-06-01
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1016/j.actamat.2019.04.012
 Degree: -

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Title: Acta Materialia
  Abbreviation : Acta Mater.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: -
Pages: - Volume / Issue: 171 Sequence Number: - Start / End Page: 48 - 64 Identifier: ISSN: 1359-6454
CoNE: https://pure.mpg.de/cone/journals/resource/954928603100