The mechanical and physical properties of metallic materials are closely related to grain size e.g. through the Hall- Petch relationship, where strength is inversely dependent to the square root of grain size. Electron backscatter diffraction (EBSD) on a Scanning Electron Microscope (SEM) is the ideal technique for determining grain size, illustrated here with a galvanized steel wire. This steel is used to manufacture bridge cables, and the importance of grain size and microstructure has been recognised as it influences the critical performance of the final steel cable.
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