OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 24 No. 1 2022 The paper analyzes the infl uence of low temperatures and stress concentrators on the value of the ultimate strength of the studied steels in the deformed and cast state. It has been established that with decreasing temperature, the value of ultimate strength increases. The stress concentration caused by the circumferential notch led to a more signifi cant increase in the ultimate strength characteristics, especially with decreasing temperature. It should be noted that the studied steels favorably differ from the traditionally used 12Cr18Ni10Ti [4] by a higher level of ultimate strength over the entire temperature range. In addition, a comparison of the properties of the cast and deformed state showed that in the deformed state both steels have higher values of ultimate strength (Figure 6). The paper analyzes the effect of low temperatures and stress concentrators on the value of the yield strength of the studied steels in the deformed and cast state. From the studies carried out, it can be seen that with a decrease in temperature, the value of the ultimate strength increases. The stress concentration caused by the circumferential notch led to a more signifi cant increase in the yield strength, especially as the temperature was lowered. It should be noted that the studied steels favorably differ from 12Cr18Ni10Ti a b c Fig. 6. The infl uence of low temperatures and the presence of stress concentrators on the value of the ultimate strength of steels: a – 12Cr18Ni10Ti [4]; b – 10Cr14NMn20; c – 10Cr14Mn14Ni4Ti
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