TrueEBSD: Correcting spatial distortions in electron backscatter diffraction maps

Tong, Vivian; Britton, T. Ben

doi:10.1016/j.ultramic.2020.113130

Cited by 19 publications

(6 citation statements)

References 31 publications

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“…The black rectangles mark the approximate position of lift-out regions A and D with the numbers indicating the expected position of the respective tip, e.g., A1 or D2, after preparation by FIB milling. The approximate lift-out regions are determined by the correlation of SEM images of the slightly etched surface and the EBSD scans due to the typical spatial distortion of EBSD maps [ 38 , 39 , 40 , 41 ]. The local tetragonality maps for lift-out regions B and C are shown in Appendix A in Figure A1 .…”

Section: Resultsmentioning

confidence: 99%

Correlation of Heterogeneous Local Martensite Tetragonality and Carbon Distribution in High Carbon Steel

et al. 2022

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A novel approach for the correlation of local martensite tetragonality determined by electron backscatter diffraction and carbon distribution by atom probe tomography (APT) is presented. The two methods are correlated by site-specific sample preparation for APT based on the local tetragonality. This approach is used to investigate the local carbon distribution in high carbon steel with varying local martensite tetragonality. Regions with low tetragonality show clear agglomeration of carbon based on statistical nearest neighbour (NN) analysis, while regions with high tetragonality show only small elongated agglomerations of carbon and no significant clustering using NN analysis. The APT average bulk carbon content shows no quantitative difference between regions with low and high tetragonality, indicating that no significant long-range diffusion of carbon has taken place.

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Section: Resultsmentioning

confidence: 99%

Correlation of Heterogeneous Local Martensite Tetragonality and Carbon Distribution in High Carbon Steel

et al. 2022

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“…The tempered martensite units appear darker in LOM than fresh martensite units and have a slight topographic contrast in FSD images as shown in Figures 5(a) and (b). The FSD images show typical spatial distortion [38][39][40][41] compared to LOM, but the tempered martensite units can be matched almost perfectly between the two methods. The small differences between both images can mainly be contributed to a different depth position due to the polishing step between FSD and LOM as well as the different contrast methods.…”

Section: Formation With Respect To Pagmentioning

confidence: 99%

Early Martensitic Transformation in a 0.74C–1.15Mn–1.08Cr High Carbon Steel

Kohne

Maimaitiyili²,

Winkelmann

et al. 2022

Metall Mater Trans A

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The martensitic transformation in a high carbon steel was studied by a new experimental approach focusing on the nucleation and growth as well as the variant pairing of the early-formed martensite. A mixed microstructure with tempered early-formed martensite and fresh later-formed martensite was achieved by a heat treatment with an isothermal hold below the martensite start temperature. In-situ high-energy X-ray diffraction showed no further transformation of austenite to ferrite/martensite during the isothermal hold. The tempered early-formed martensite was characterized with a combination of light optical microscopy and local tetragonality determination by electron backscatter diffraction. The characterization allowed qualitative as well as quantitative analysis of the tempered early-formed martensite with regard to the prior austenite grain boundaries (PAGB) and variant pairing. The early-formed martensite was shown to grow predominantly along the PAGBs and clustering was observed indicating an autocatalytic nucleation mechanism. The variant pairing of the early-formed martensite had a stronger plate character compared to the later-formed martensite.

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“…The presented multimodal data fusion workflow accomplishes two tasks: first, it corrects distortions in the EBSD map [13], and secondly, it fuses data from the particle map of higher fidelity with the corrected EBSD map. There are numerous available solutions to the first task [15,33,34], with various degrees of complexity. To accomplish the first task, the present workflow requires a minimum of two images showing shared features, but which can have totally different contrast and intensity, manual selection of a sufficient number of CPs uniformly distributed in the images, and a single transformation function without tuning parameters to correct distortions in the EBSD map based on the CPs.…”

Section: Evaluation Of the Multimodal Data Fusion Workflowmentioning

confidence: 99%

Correlated subgrain and particle analysis of a recovered Al-Mn alloy by directly combining EBSD and backscatter electron imaging

Ånes¹,

Helvoort²,

Marthinsen³

2022

Preprint

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Correlated analysis of (sub)grains and particles in alloys is important to understand transformation processes and control material properties. A multimodal data fusion workflow directly combining subgrain data from electron backscatter diffraction (EBSD) and particle data from backscatter electron (BSE) images in the scanning electron microscope is presented. The BSE images provide detection of particles smaller than the applied step size of EBSD down to 0.03 µm in diameter. The workflow is demonstrated on a cold-rolled and recovered Al-Mn alloy, where constituent particles formed during casting and dispersoids formed during subsequent heating affect recovery and recrystallization upon annealing. The multimodal dataset enables statistical analysis including subgrains surrounding constituent particles and dispersoids' location with respect to subgrain boundaries. Among the subgrains of recrystallization texture, Cube{001} 100 subgrains experience an increased Smith-Zener drag from dispersoids on their boundaries compared to CubeND{001} 310 and P{011} 56 6 subgrains, with the latter experiencing the lowest drag. Subgrains at constituent particles are observed to have a growth advantage due to a lower dislocation density and higher boundary misorientation angle. The dispersoid size per subgrain boundary length increases as a function of misorientation angle. The workflow should be applicable to other alloy systems where there is a need for analysis correlating grains and grain boundaries with secondary phases smaller than the applied EBSD step size but resolvable by BSE imaging.

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TrueEBSD: Correcting spatial distortions in electron backscatter diffraction maps

Cited by 19 publications

References 31 publications

Correlation of Heterogeneous Local Martensite Tetragonality and Carbon Distribution in High Carbon Steel

Correlation of Heterogeneous Local Martensite Tetragonality and Carbon Distribution in High Carbon Steel

Early Martensitic Transformation in a 0.74C–1.15Mn–1.08Cr High Carbon Steel

Correlated subgrain and particle analysis of a recovered Al-Mn alloy by directly combining EBSD and backscatter electron imaging

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