TY - JOUR N2 - The aim of the performed experiments was to determine the influence of a cooling rate on the evolution of microstructure and hardness of the steel 27MnCrB5. By using dilatometric tests performed on the plastometer Gleeble 3800 and by using mathematical modelling in the software QTSteel a continuous cooling transformation diagram for a heating temperature of 850°C was constructed. Conformity of diagrams constructed for both methods is relatively good, except for the position and shape of the ferrite nose. The values of hardness, temperatures of phase transformations and the volume fractions of structural phases upon cooling from the temperature of 850°C at the rate from 0.16°C · s–1 to 37.2°C · s–1 were determined. Mathematically predicted proportion of martensite with real data was of relatively solid conformity, but the hardness values evaluated by mathematical modelling was always higher. L1 - http://journals.pan.pl/Content/106701/PDF/AMM-2018-2-47-Kawulok.pdf L2 - http://journals.pan.pl/Content/106701 PY - 2018 IS - No 2 DO - 10.24425/122421 KW - Steel 27MnCrB5 KW - continuous cooling transformations diagrams KW - dilatometric tests KW - plastometer Gleeble 3800 KW - software QTSteel A1 - Schindler, I. A1 - Kawulok, P. A1 - Mizera, J. A1 - Rusz, S. A1 - Kawulok, R. A1 - Opěla, P. A1 - Olszar, M. A1 - Čmiel, K.M. PB - Institute of Metallurgy and Materials Science of Polish Academy of Sciences PB - Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences VL - vol. 63 DA - 2018.06.30 T1 - The Influence of a Cooling Rate on the Evolution of Microstructure and Hardness of the Steel 27MnCrB5 UR - http://journals.pan.pl/dlibra/publication/edition/106701 T2 - Archives of Metallurgy and Materials ER -