The paper is dedicated to the verification of solidification of continuously cast round steel billets using numerical modelling based on the finite element method. The aim of numerical modelling is to optimize the production of continuously cast steel billets of round format. The paper describes the pre-processing, processing and post-processing phases of numerical modelling. Also, the problems with determination of the thermodynamic properties of materials and the heat transfer between the individual parts of the casting system, including the definition of the heat losses along the casting strand in the primary and secondary cooling, were discussed. The first results of numerical simulation show the so-called thermal steady state of continuous casting. The temperature field, the metallurgical length and the thickness of the shell at the end of the mould were predicted. The further research will be concentrated on the prediction the risk of the cracks and the porosity based on the different boundary conditions.
This paper is devoted to the comparison of theoretically defined solidus and liquidus temperatures based on above mentioned theoretical methods with the results of high-temperature thermal analysis carried out on two devices (Netzsch STA 449 F3 Jupiter; Setaram SETSYS 18TM). On large samples (23 g), the method of direct thermal analysis was applied. On small samples (200 mg), the experiments using differential thermal analysis were realized. It was found out that the solidus and liquidus temperatures for the studied steel grade can vary in dependence on the used determination method. The used methodology of thermal analysis is fully reproducible, and the these thermo-analytical results can be considered as necessary for the correct setting of critical parameters in applied research on the process of steel casting.
A series of novel environmentally inorganic pigments based on Bi2O3 doped by metal ions such as Zr4+ and Ho3+ have been developed and characterized using of methods of thermal analysis, Xray powder diffraction and CIE
This paper is devoted to the study of macro-segregations on the longitudinal section of a continuously cast billet Ø 160 mm destined for the production of seamless pipes. Its evaluation comprised a visual inspection of macro-etching, microstructure characterisation and a quantitative X-ray microanalysis by means of an energy-dispersive X-ray microanalysis (EDX) in the selected areas. Furthermore, segregation parameters were calculated using combustion-analysis data. The results given in this paper present the basic information about the interior structure of a continuously cast billet. The results will be used, beside other things, for the verification of the results of the numerical modelling of continuously cast billets. Keywords: steel, macro-segregation, continuous casting, round billet Ta~lanek obravnava {tudij makro-izcej na vzdol`nem prerezu kontinuirno ulite gredice Ø 160 mm namenjene za proizvodnjo brez{ivnih cevi. Ocena je sestavljena iz vizuelnega pregleda po makrojedkanju, iz ocene in kvantitativne rentgenske mikroanalize s pomo~jo energijsko disperzijske rentgenske analize (EDX) izbranih podro~ij. Izra~unani so bili tudi parametri izcejanja s pomo~jo podatkov zgorevne analize. Rezultati, prikazani v tem~lanku, predstavljajo osnovno informacijo o notranji strukturi v kontinuirno uliti gredici. Rezultati bodo uporabljeni, poleg drugega, tudi za preverjanje rezultatov numeri~nega modeliranja kontinuirno ulitih gredic.
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