Abstract The microstructures and mechanical properties ofЭП866 martensite heat-resistant steel submitted to equal channel angular pressing (ECAP) for one pass and subsequent heat treatment were investigated. It was hound that most of the lath martensite has been broken, and the nano-precipitant distributed more uniformly after ECAP deformation. By annealing at 680℃ for 2h, the dislocation density decreased and a great deal of equiaxed subgrains with sizes of several hundred of nanometers were produced, which could be attributed to the dislocation recovery and recrystallization. The yield strength of the ECAPed sample increased significantly, but its ductility decreased a lot. After subsequent annealing treatment, the ductility of the ECAP steel can be improved to the level of initial state. Both the strength and static toughness of the steel after ECAP deformation and subsequent heat treatment can be increased simultaneously compared with those of initial state.
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