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Characterization of microstructural changes in near pearlitic steels using orientation imaging microscopy: Influence of predeformation on local sensitivity to thermal degradation
Chalmers University of Technology.ORCID iD: 0000-0001-5140-9074
Chalmers University of Technology.
2015 (English)In: IOP Conference Series: Materials Science and Engineering, Institute of Physics Publishing (IOPP), 2015, no 1, article id 012039Conference paper, Published paper (Refereed)
Abstract [en]

The focus of this study is the degradation of a near pearlitic microstructure under combined mechanical and thermal loadings leading to changes in mechanical properties. More specifically, it is examined how the orientation gradients inside the pearlite colonies, affect the spheroidisation. Samples were extracted from virgin near pearlitic railway wheels and prestrained, thereafter heat treated at different temperatures. Microstructural characterization by scanning electron microscopy (SEM) and Electron Backscatter Diffraction Analysis (EB SD) was performed and evaluated. Results showed that spheroidised areas appear to have lost their initial orientation gradients after spheroidisation and obtain a more uniform orientation. More sub-grain boundaries are present after exposure to higher temperatures. 

Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2015. no 1, article id 012039
Series
IOP Conference Series: Materials Science and Engineering, ISSN 1757-8981, E-ISSN 1757-899X ; 89
Keywords [en]
Grain boundaries, Pearlite, Scanning electron microscopy, Electron backscatter diffraction analysis, Initial orientation, Micro-structural characterization, Microstructural changes, Orientation gradients, Orientation imaging microscopy, Pearlitic microstructure, Subgrain boundaries, Characterization
National Category
Other Materials Engineering
Research subject
Materials Engineering
Identifiers
URN: urn:nbn:se:kau:diva-86928DOI: 10.1088/1757-899X/89/1/012039Scopus ID: 2-s2.0-84941243548OAI: oai:DiVA.org:kau-86928DiVA, id: diva2:1608858
Conference
36th Riso International Symposium on Materials Science, 7 - 11 September 2015
Available from: 2021-11-04 Created: 2021-11-04 Last updated: 2021-11-10Bibliographically approved

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Dimitrios, Nikas

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