. "Steel and ductile cast-iron rollers, between which train rails (with a hardness of 300 HB) are rolled, are cast into cylindrical iron moulds. It is necessary to cast rollers with significantly improved utility properties, mainly high wear-resistance and optimal mechanical and structural properties. The requirements introduced here cannot be met without perfect knowledge of the course of solidification, cooling and heat treatment of the cast rollers as well as the kinetics of the temperature field of the casting and mould . It is necessary to use a numerical model of the temperature field of the entire system - comprising the casting, the mould and ambient . Experimental research and temperature measurement must be conducted simultaneously with numerical calculation . The kinetics of the solidification has a non-negligible influence on the chemical and structural heterogeneity of the cast-iron in question . An original methodology for the measurement of microheterogeneity had been developed - based o" . "Tanger s.r.o." . "P(GA106/08/0606)" . "Kavi\u010Dka, Franti\u0161ek" . "Chemical and structural heterogeneity of a gravitationally cast ductile-cast-iron roller and its relationship to thermokinetic solidification" . "Chemical and structural heterogeneity of a gravitationally cast ductile-cast-iron roller and its relationship to thermokinetic solidification" . . . . "26210" . "359703" . "\u0160t\u011Btina, Josef" . . . "Chemical and structural heterogeneity of a gravitationally cast ductile-cast-iron roller and its relationship to thermokinetic solidification"@en . "ductile- cast-iron roller, solidification, temperature field, numerical model, microheterogeneity"@en . "RIV/00216305:26210/08:PU75284!RIV10-GA0-26210___" . . "[C1C72C99F835]" . . . . . . "1"^^ . "Steel and ductile cast-iron rollers, between which train rails (with a hardness of 300 HB) are rolled, are cast into cylindrical iron moulds. It is necessary to cast rollers with significantly improved utility properties, mainly high wear-resistance and optimal mechanical and structural properties. The requirements introduced here cannot be met without perfect knowledge of the course of solidification, cooling and heat treatment of the cast rollers as well as the kinetics of the temperature field of the casting and mould . It is necessary to use a numerical model of the temperature field of the entire system - comprising the casting, the mould and ambient . Experimental research and temperature measurement must be conducted simultaneously with numerical calculation . The kinetics of the solidification has a non-negligible influence on the chemical and structural heterogeneity of the cast-iron in question . An original methodology for the measurement of microheterogeneity had been developed - based o"@en . . "Chemical and structural heterogeneity of a gravitationally cast ductile-cast-iron roller and its relationship to thermokinetic solidification"@en . . "Proceedings of METAL 2008" . "5"^^ . . "Str\u00E1nsk\u00FD, Karel" . "Ostrava" . "Mol\u00EDnek, Ji\u0159\u00ED" . . . . . "Hradec nad Moravic\u00ED" . . . "Dobrovsk\u00E1, Jana" . "RIV/00216305:26210/08:PU75284" . "4"^^ . "978-80-254-1987-8" . "2008-05-13+02:00"^^ .