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Structure characterization within the vicinity of the fine granular area by synchrotron radiation nano‐CT
Author(s) -
Liu Long,
Hou Nan,
Li Bochuan,
Ma Bo,
Hu Songqing,
Ding Ning
Publication year - 2020
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/ffe.13255
Subject(s) - materials science , synchrotron radiation , microstructure , nano , composite material , fracture (geology) , characterization (materials science) , focused ion beam , synchrotron , beam (structure) , radiation , optics , nanotechnology , physics , ion , quantum mechanics
Abstract The three‐dimensional (3D) microstructures within the vicinity of the fine granular area (FGA) were investigated with synchrotron radiation nano‐computed tomography (CT). In this investigation, the very high cycle fatigue test of a high‐strength steel was carried out with an ultrasonic fatigue testing machine. Then, focused ion beam cutting was used to cut a part near the surface of the FGA. Finally, the 3D structure of the sample was obtained with the nano‐CT imaging. The results indicated that the base material was composed of various subgrains that are tens to hundreds nanometres in size. Through analysis of the slices, small granular areas consist of several subgrains. The statistical analysis of the subgrain size indicated that the subgrain size near the surface of the FGA is similar to that far from the surface of the FGA and near the fracture surface except the FGA. It indicated that the refinement has not been found by nano‐CT.