OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 24 No. 1 2022 a b c Fig. 9. Effect of low temperatures and the type of stress concentrator on the values of impact strength of steels in the deformed state: a – 12Cr18Ni10Ti [4]; b – 10Cr14NMn20; c – 10Cr14Mn14Ni4Ti Conclusion It was found that an increase in the strain rate from 0.34 × 10–4 s–1 to 0.34 × 10-1 s–1 and further to 0.34 × 102 s–1 at temperatures below 0 °С contributes to a decrease in the number of martensitic phases in the studied steels. It was confi rmed that the presence of a stress concentrator on cylindrical samples in the deformed and cast state during static tensile testing provided an increase in strength values, with a decrease in the values of toughness and plasticity. It was found that the hardenability during elastic-plastic deformation decreases and completely disappears at the temperature of the material transition to a brittle state;
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