The evolution of structure of 0. 78C-1. 03Cr eutectoid pearlitic steel Φ8 mm x 45 mm sample with two pass equal channel angular pressing at ambient temperature has been studied by scanning

transmission electron microscope and X- ray diffraction method. Results showed that after one pass equal channel angular pressing

the deformed eutectoid pearlitic structure consisted of cementite irregularly bent lamellae t sheared breaking lamellae and locally thinned lamellae. With pass number increasing the proportion of locally thinned lamellae and irregularly bent lamellae increased

and partial cementite dissolved.