TY - JOUR N2 - Influence of the initial grain size on hot deformation behavior of the low-alloy Mn-Ti-B steel was investigated. The uniaxial compression tests were performed in range of the deformation temperatures of 900-1200°C and strain rates of 0.1-10 s–1. One set of samples was heated directly to the deformation temperature, which corresponded to the initial austenitic grain size of 19-56 μm; the other set of samples was uniformly preheated at the temperature of 1200°C. Whereas the values of activation energy, peak stress and steady-state stress values practically did not depend on the initial austenitic grain size, the peak strain values of coarser-grained structure significantly increase mainly at high values of the Zener-Hollomon parameter. This confirms the negative effect of the large size of the initial grain on the dynamic recrystallization kinetics, which can be explained by the reduction in nucleation density. L1 - http://journals.pan.pl/Content/109146/PDF/AMM-2018-4-27-Kawulok.pdf L2 - http://journals.pan.pl/Content/109146 PY - 2018 IS - No 4 EP - 1792 DO - 10.24425/amm.2018.125105 KW - Initial austenition grain size KW - peak stress KW - peak strain KW - Mn-Ti-B steel A1 - Kawulok, P. A1 - Schindler, I. A1 - Kawulok, R. A1 - Opěla, P. A1 - Sedláček, R. 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 - 2018.12.12 T1 - Influence of Heating Parameters on Flow Stress Curves of Low-Alloy Mn-Ti-B Steel SP - 1785 UR - http://journals.pan.pl/dlibra/publication/edition/109146 T2 - Archives of Metallurgy and Materials ER -