Abstract
1. Dynamic weakening occurs in steel 20 due to the formation and growth of recrystallized grains with migration of high-angle boundaries; in steel 12Kh18N10T dynamic recrystallization develops with large deformations by coalescence of subgrains, which leads to retention of high dislocation density in recrystallized grains. 2. Static weakening of hot-worked austenitic steel 12Kh18N10T develops more slowly than in steel 20. The rate of static weakening varies with the degree of deformation for both steels. After small hot deformations the weakening process requires an incubation period. Large deformations, accompanied by dynamic recrystallization (coalescence of subgrains, migration of high-angle boundaries), leads to intensive static recrystallization (postdeformation weakening) without any noticeable incubation period.
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