This paper presents the results of preliminary low-cycle fatigue tests of 1.2344 tool steel, used to make forging tools for work in higher temperatures. Based on macro- and micro-structural studies and numerical simulation of industrial forging processes, the conditions for performing laboratory fatigue tests were determined. Samples were subjected to cyclic, uniaxial loading (under tensile-compressive conditions) at four levels of total strain amplitude (0.5; 0.8; 1.0; 2.0 %), at two temperatures: 20 and 600 °C. The results of fatigue tests were approximated using the Manson-Coffin-Basquin equation in a εa-2Nf system and then used during verification of damage on a selected forging punch, which revealed high consistency between results. The comparative analysis of fatigue test results and numerical analyses, combined with microstructural studies, conducted in this work, demonstrated the possibility of using these tests, analyses and studies in the process of designing tools used in forging processes from the perspective of their durability and resistance to thermomechanical fatigue.Keywords: low cycle fatigue of 1.2344 steel, durability of forging tools, thermo-mechanical fatigue
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