STRUCTURAL-CHANGES OF FERRITIC STAINLESS-STEEL DURING SEVERE PLASTIC-DEFORMATION

The mechanical properties and structural evolution of ferritic stainle ss steel (0.13%C, 25%Cr, 0.9%Ti, Fe-balance) during severe plastic def ormation at ambient temperature have been studied. The effect of strai n on the character of structural changes has been investigated. It has been found that after large strain dynamic recrystallization occurs i n the material with an initially coarse-grained structure. The dynamic recrystallization mechanisms are considered. It has been revealed tha t both the grain size and the hardening effect are strain dependent. W ith increasing strain the grain size decreases while the microhardness increases.