Effect of temperature on the mechanical properties and strain hardening of low-carbon steels 15Kh2MFA and 15Kh2MNFA
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Improvement of the method given in  made it possible to determine the mechanical characteristics and plot the true strain diagram for steels in the low-temperature range down to −196 °.
The behavior of the true strain diagram and the type of temperature dependence of the breaking stress for steels 15Kh2MFA and 15Kh2MNFA are due to a difference in the fracture mechanism in the temperature range from −196 to 350 °. The reason for the sharp reduction of the stress Sk with dropping temperatures is shearing in planes parallel to the axis of the sample.
The characteristics of strain hardening change substantially for steels 15Kh2MNFA and 15Kh2MNFA with decreasing temperatures.
KeywordsMechanical Property Fracture Mechanism Strain Hardening Mechanical Characteristic True Strain
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