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

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 spatial resolution the order 100 nm. Compared to spatially integrating X-ray diffraction, which yielded an average c/a = 1.05, EBSD measurements scanning microscope allowed image local variation lattice parameter ratio range 1.02 ≤ 1.07. is confirmed two different data analysis approaches based on fitting simulated experimental patterns. resulting EBSD-based maps are pointing complex interaction carbon concentration and distortions during formation process martensitic structures.