Dislocation structure of cementite in granular pearlite after cold plastic deformation

Cementite microstructure of the U8 steel with a granular pearlite structure has been investigated by the method of electron microscopy. It has been established that, at the early stages of deformation, carbide particles are deformed through the movement of stacking faults, which are characterized by an α010] partial shift in the (001) planes of cementite. The Burgers vector, the slip plane 010](001) of the split dislocations forming pileups, and deformation bands have been determined using gb analysis. The stacking fault energy has been estimated in a (001) cementite plane: γ_sf ～ 12.8 mJ/m². With increasing degree of deformation, an additional slip has been shown to occur in cementite by the system 100](011).