Abstract
A system for recording the contraction of cylindrical specimens under static compression loading was developed based on the original cantilever-type extensometer and the L-Card E-440 analog-todigital converter with Power Graph software for data acquisition and pre-processing. 26H2MF and St12T steels’ stress–strain diagrams in compression at elevated temperatures were constructed. The influence of temperature on their mechanical characteristics was established. It is shown that at elevated temperatures (200–800°C), the mechanical characteristics of St12T steel are higher than those of 26H2MF steel, while at lower temperatures (20–200°C), they are close. At elevated temperatures, St12T steel is found to exhibit a significant difference between the tensile and compressive strengths. At temperatures above 400°C, the tension-to-compression yield strength ratio sharply decreases, while for 26H2MF steel it is almost unchanged. The nature of such dependences can be attributed to the structural-phase composition of steels, which determines their resistance to elastic-plastic deformation by compression.
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