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The contribution of microstructure elements to the yield strength of medium carbon 54SiCr6 steel was investigated. The microstructure was examined using scanning electron microscopy, transmission electron microscopy, electron back scattering diffraction and X-ray diffraction. The mechanical properties were assessed using a tensile test in accordance with CSN EN ISO 6892-1 standard. The influence of grain boundaries, dislocation density, size and volume fraction of carbide precipitates, distance between twins on the yield strength was estimated. The predominant contribution of twins to the yield strength for steel under investigation was established.
Keywords: Medium carbon steel, carbides, tempering, microstructure, twins, mechanical properties© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.