Tetragonality mapping of martensite in a high-carbon steel by EBSD

Gert Nolze, Aimo Winkelmann, Grzegorz Cios, Tomasz Tokarski

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The locally varying tetragonality in martensite grains of a high-carbon steel (1.2 mass percent C) was resolved by electron backscatter diffraction (EBSD) with a spatial resolution in the order of 100 nm. Compared to spatially integrating X-ray diffraction, which yielded an average tetragonality of c/a = 1.05, the EBSD measurements in the scanning electron microscope allowed to image a local variation of the lattice parameter ratio c/a in the range of 1.02 <c/a <1.07. The local variation of tetragonality is confirmed by two different EBSD data analysis approaches based on the fitting of simulated to experimental EBSD patterns. The resulting EBSD-based tetragonality maps are pointing to a complex interaction of carbon concentration and local lattice distortions during the formation process of martensitic structures.
Original languageEnglish
Article number111040
Number of pages12
JournalMaterials Characterization
Early online date13 Mar 2021
Publication statusPublished - 31 May 2021


  • EBSD
  • martensite
  • tetragonal distortion
  • pattern matching


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