The paper is aimed at evaluation of effect previous plastic deformation on transformation kinetics of rail steel class IH alloyed with chromium. The CCT and DCCT diagrams were assembled on the basis of dilatometric tests with and/or without an influence of the previous deformation. To the experiment execution the dilation module of the plastometer Gleeble 3800 was used. The Accuracy of the diagrams was faced with metallographic analysis and measurement of hardness. The obtained results were compared with the results of in-process measurement of rail rolling mill Třinecké železárny Inc. This confirmed the theory that in the case of steels which are intended for rolling rails, no influence of the previous deformation the crucial influence pearlitic transformation in terms of time, but in the case of higher cooling rate has deformation an appreciable effect on shift temperature intervals of pearlite formation.Keywords: Rail steel, phase transformation of steel,CCT and DCCT diagrams, dilatometric tests, Gleeble 3800
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