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Automated classification of granular bainite and polygonal ferrite by electron backscatter diffraction verified through local structural and mechanical analyses

Jentner, R. M.; Tsai, S. P.; Welle, Alexander ORCID iD icon 1,2; Scholl, S.; Srivastava, K.; Best, J. P.; Kirchlechner, Christoph 3; Dehm, G.
1 Institut für Funktionelle Grenzflächen (IFG), Karlsruher Institut für Technologie (KIT)
2 Karlsruhe Nano Micro Facility (KNMF), Karlsruher Institut für Technologie (KIT)
3 Institut für Angewandte Materialien – Werkstoff- und Grenzflächenmechanik (IAM-MMI), Karlsruher Institut für Technologie (KIT)

Abstract:

Differentiation of granular bainite and polygonal ferrite in high-strength low-alloy (HSLA) steels possesses a significant challenge, where both nanoindentation and chemical analyses do not achieve an adequate phase classification due to the similar mechanical and chemical properties of both constituents. Here, the kernel average misorientation from electron backscatter diffraction (EBSD) was implemented into a Matlab code to differentiate and quantify the microstructural constituents. Correlative electron channeling contrast imaging (ECCI) validated the automated phase classification results and was further employed to investigate the effect of the grain tolerance angle on classification. Moreover, ECCI investigations highlighted that the grain structure of HSLA steels can be subdivided into four grain categories. Each category contained a different nanohardness or substructure size that precluded a nanoindentation-based phase classification. Consequently, the automated EBSD classification approach based on local misorientation achieved a reliable result using a grain tolerance angle of 5°.


Verlagsausgabe §
DOI: 10.5445/IR/1000161714
Veröffentlicht am 29.08.2023
Originalveröffentlichung
DOI: 10.1557/s43578-023-01113-7
Scopus
Zitationen: 2
Web of Science
Zitationen: 2
Dimensions
Zitationen: 2
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Funktionelle Grenzflächen (IFG)
Karlsruhe Nano Micro Facility (KNMF)
Institut für Angewandte Materialien – Werkstoff- und Grenzflächenmechanik (IAM-MMI)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2023
Sprache Englisch
Identifikator ISSN: 0884-2914, 2044-5326
KITopen-ID: 1000161714
HGF-Programm 43.31.01 (POF IV, LK 01) Multifunctionality Molecular Design & Material Architecture
Erschienen in Journal of Materials Research
Verlag Cambridge University Press (CUP)
Band 38
Seiten 4177–4191
Vorab online veröffentlicht am 24.08.2023
Schlagwörter 2021-027-031204 ToF-SIMS
Nachgewiesen in Dimensions
Scopus
Web of Science
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