Abstract
A low-carbon steel was processed by equal channel angular pressing (ECAP) in order to produce a submicrocrystalline (SMC) structure in it. The process was carried out at 400 °C through the route A up to two passes. As a result, of a severe plastic deformation during ECAP, the ferrite grains were reduced from 10 μm to 0.2~0.3 μm, pearlite colonies were crashed and dispersed. The results the yield and tensile strength increased significantly. To reduce the negative influence of a strain hardening after the process of ECAP, quenching and short term annealing of the steel was carried out. The impact toughness increased after ECAP and quenching, impact tests conducted at +20°C and –20°C showed a 1.3-fold increase in impact toughness. The fracture surfaces were investigated in detail after impact tests. The mechanisms of fracture in various structural states are shown.
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