5 types of steel, which were differently alloyed with chromium, molybdenum and nickel, were examined. Determination of the temperatures martensite start temperature (Ms) and martensite finish (Mf) was performed by dilatometer with the use of the plastometer GLEEBLE 3800 and relevant CCT evaluation software. In all the steels alloyed with chromium and optionally with molybdenum it was possible to graphically localise the temperature, at which the curves Ms and Mf meet. The addition of nickel dramatically changes the situation, because at low cooling rates the martensitic area is very smoothly followed by bainitic region and determination of their boundaries is difficult. Determination of the temperatures Ms and Mf is important for the exact setting of refinement processes.Keywords: Dilatometric test, Gleeble 3800, martensitic transformation temperature
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