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Synchrotron analysis of toughness anomalies in nanostructured bainite

Fielding, LCD; Jones, NG; Walsh, J; Van Boxel, S; Blackmur, MS; Lee, PD; Withers, PJ; ... Bhadeshia, HKDH; + view all (2016) Synchrotron analysis of toughness anomalies in nanostructured bainite. Acta Materialia , 105 pp. 52-58. 10.1016/j.actamat.2015.11.029. Green open access

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Abstract

High-resolution synchrotron X-ray diffraction has been used to characterise the notch root regions of Charpy impact test specimens of a superbainitic steel, both before and after loading. The changes in the volume fraction of austenite induced by the application of a three-point-bending load were quantified. Analysis of diffraction peak shifts revealed the extent of residual tensile and compressive strains present due to both machining and an applied load. The results lend support to the hypothesis that the comparatively low energies absorbed during Charpy impact testing of superbainitic steels, <7 J, are due to the formation of stress-induced martensite at the notch root, prior to crack initiation.

Type: Article
Title: Synchrotron analysis of toughness anomalies in nanostructured bainite
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.actamat.2015.11.029
Publisher version: https://doi.org/10.1016/j.actamat.2015.11.029
Language: English
Additional information: This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
Keywords: Bainitic steel, Synchrotron diffraction, Charpy impact test, Toughness
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/10062982
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