Wear-induced formation of a novel face-centred cubic Fe-C ordered phase on cast iron surfaces

The microstrucure of wear-induced transfer layer on cast iron surface was investigated using scanning electron microscopy, transmission electron microscopy and X-ray diffraction. The results indicate that a novel face-centred cubic Fe-C ordered phase with the lattice parameter a = 0.38 nm was formed in the microstructure. The experimental results show that the microhardness of wear-transfer layer is higher than that of the substrate due to presenting of the Fe-C ordered phase and Fe3O4 nanocrystalline phase.