Abstract
Electron energy loss spectroscopy (EELS) was used to study bonding of grain boundaries (GBs) in various types of commercial steels. It is found that if the GB has a higher occupancy of 3d states of iron than that of the grain, the sample tends to fracture intergranularly. Otherwise if the GB has a lower occupancy of 3d state of iron than the grain, the sample would have a strong GB bonding and tends to fracture transgranularly. It is proposed that EELS can estimate the GB cohesion and its impact on the fracture mode of commercial steels.
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