Abstract
Modern steel developments often use additional deformation mechanisms like the deformation induced martensitic transformation (TRIP-effect) and mechanical twinning (TWIP-effect) to enhance elongation and strength. Three high-alloyed cast CrMnNi-steels with different austenite stabilities were examined. Dependent on the austenite stability, TRIP-effect and TWIP-effect were found. A low austenite stability causes a distinctive formation of deformation induced α'-martensite and therefore a strong strain hardening. The increase of strain rate leads to an increase in yield strength and flow stress, but also to a counteractive adiabatic heating of the specimen. Dependent on the degree of deformation, low austenite stabilities and high strain rates lead to excellent values in specific energy absorption.
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