In this study, the fracture behaviour of steel based composite and nanocomposite fabricated by accumulative roll bonding process was investigated using scanning electron microscopy fractography. The nanocomposite failed through decohesion and then void nucleation and linking in the matrix near the reinforcement/matrix interface and without particle fracture mechanism, whereas the composite failed through both decohesion and particle fracture mechanisms and then void nucleation, growth, and coalescence in the matrix near the reinforcement. The results indicated that the fracture mode after first cycle for pure interstitial steel, composite and nanocomposite is combination of ductile and shear ductile fracture. But, with increasing the number of cycles, the dimple size and the dimple depth decreased.
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