Abstract
1. Ductility properties of the test unstable austenitic steels increase during martensite transformation if it is preceded by plastic deformation of austenite. 2. Maximum ductility of the test steels is obtained with strictly optimum kinetics for martensite transformation which depends on the level of prior deformation. After quenching maximum ductility is obtained with a low intensity of transformation; the ductility peak is observed close to the Md point. 3. After prior deformation maximum ductility corresponds to the greatest intensity of transformation. With an increase in the degree of prior deformation the ductility peak shifts in the direction of lower temperature, and the intensity of martensite transformation corresponding to maximum ductility increases. 4. Martensite transformation may have both a strengthening and a relaxation effect. After quenching steels it mainly develops as a strengthening effect, and after deformation as a relaxation effect.
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