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.

中文翻译：

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26H2MF和St12T钢在高温压缩下的力学特性

基于原始的悬臂式引伸计和带有Power Graph软件的L-Card E-440模数转换器，开发了一种在静态压缩载荷下记录圆柱形试样收缩的系统，用于数据采集和预处理。绘制了26H2MF和St12T钢在高温下压缩时的应力-应变图。确定了温度对其机械特性的影响。结果表明，在高温（200–800°C）下，St12T钢的力学性能高于26H2MF钢，而在低温（20–200°C）下，它们的力学性能接近。在升高的温度下，发现St12T钢的拉伸强度和压缩强度之间存在显着差异。在高于400°C的温度下，拉伸压缩屈服强度比急剧下降，而26H2MF钢则几乎没有变化。这种依赖关系的性质可以归因于钢的结构相组成，它决定了钢对压缩产生的弹塑性变形的抵抗力。