Tetragonality of Fe-C martensite – a pattern matching electron backscatter diffraction analysis compared to X-ray diffraction

Measurements of the local tetragonality in Fe-C martensite at microstructural length-scale through pattern matching of electron backscatter diffraction patterns (EBSPs) and careful calibration of detector geometry are presented. It is found that the local tetragonality varies within the complex micr...

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Bibliographic Details
Published in:Acta materialia 2020-08, Vol.195, p.728-738
Main Authors: Tanaka, Tomohito, Maruyama, Naoki, Nakamura, Nozomu, Wilkinson, Angus J.
Format: Article
Language:English
Subjects:
Calibration
Electron backscatter diffraction
HR-EBSD
Martensitic steel
Pattern matching
Tetragonality
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Summary:Measurements of the local tetragonality in Fe-C martensite at microstructural length-scale through pattern matching of electron backscatter diffraction patterns (EBSPs) and careful calibration of detector geometry are presented. It is found that the local tetragonality varies within the complex microstructure by several per cent at largest and that the scatter in the axial ratio is increased at higher nominal carbon content. At some analysis points the local crystal structure can be regarded as lower symmetry than simple body centred tetragonal. A linear relation between the nominal carbon content and averaged local tetragonality measured by EBSD is also obtained, although the averaged axial ratio is slightly below that obtained from more classical X-ray diffraction measurements. [Display omitted]
ISSN:1359-6454
1873-2453
DOI:10.1016/j.actamat.2020.06.017