Hana Francová

Hana Francová
VSB - Technical University of Ostrava

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18
Publications
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65
Citations

Publications

Publications (18)
Article
Three Fe–C–Cr and three Fe–C–Cr–Ni-based alloys containing carbon between 0.318 and 0.410 mass%, chromium and nickel between of 0.001 and 4.990 mass% were studied. Original temperatures of solidus, liquidus and peritectic transformation were determined and clarified for all six specific alloys. Phase transition temperatures were experimentally obta...
Article
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 microa...
Article
Full-text available
Crystallization of metallic materials occurs during their casting and following solidification. The influence of directional material solidification, the size of grains, chemical heterogeneity and existence of any non – compactness, can negatively affect properties of the final product. Microstructural analysis of its longitudinal section was perfo...
Article
The paper deals with the study of latent heats of melting of three real steels (one low-alloyed steel and two chromium steels) and temperatures of liquidus, peritectic transformation and solidus of these steels. All quantities were obtained using the differential scanning calorimetry method (DSC). The Setaram MHTC (multi-high-temperature calorimete...
Book
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The book is a comprehensive work summarizing the results of more than 20 years of systematic research in the field of modeling of solidification and crystallization of metallic and ceramic materials. The book introduces the original models for the temperature field simulation and an original methodology for chemical heterogeneity investigation and...
Article
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Thepaper deals with an experimental measurement of the transformation temperatures of Co-base alloy. Temperatures were determined by means of DTA-method during controlled heating and cooling. The samples in an as-received state were analysed at heating/cooling rates of 2, 5, 10 and 20 °C/min with the use of the equipment Setaram SETSYS 18TM (DTA-me...
Article
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The paper deals with investigation into segregation behavior of selected elements in longitudinal cut of continuous steel slab, in the breakout area. The breakout occurred after a flying change of tundish in order to begin casting of another steel grade. Altogether 11 samples were taken from the part of a solidified slab. Concentrations of selected...
Article
Full-text available
The paper deals with a new approach to measuring and evaluating the chemical micro-heterogeneity of the elements in solidified poly-component metallic systems. The original approach is based on experimental measurements made on the samples taken from characteristic places in a casting and the subsequent application of an original mathematical model...
Article
This paper deals with the possibility of prediction of solidification temperature of steel on the base of the description of (micro)segregation processes using selected microsegregation models. Two models of non-equilibrium crystallization are considered: The model with fully suppressed diffusion in the solid phase (Scheil's model) and the model wi...
Article
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The presented paper deals with the study of thermophysical properties of cast and complex alloyed nickel based on superalloy Inconel 713LC (IN713LC). In this work, the technique of Differential Thermal Analysis was selected for determination of the phase transformation temperatures and for the study of the effect of varying heating/cooling rate at...
Article
The paper deals with investigation into segregation behavior of selected elements in longitudinal cut of steel slab, in the breakout area. The breakout occurred after a flying tundish change at a steel grade changing. Altogether 11 samples were taken from the part of a solidified slab. Samples were taken both from the breakout areas and from the ar...
Article
Full-text available
Parameter of back diffusion (the mass Fourier number) occurs in majority of the used micro-segregation models. It characterises diffusion of elements in solid phase in respect to the secondary dendrite arms spacing and to the local time of solidification. The presented paper calculates parameters of back diffusion of determined elements (C, Si, Mn,...
Article
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VŠB Technická univerzita Ostrava, 17.listopadu 15, 708 33 Ostrava Jana Dobrovská -VŠB Technická univerzita Ostrava, 17.listopadu 15, 708 33 Ostrava Adam Pawliczek -VŠB Technická univerzita Ostrava, 17.listopadu 15, 708 33 Ostrava Ludovít Dobrovský -VŠB Technická univerzita Ostrava, 17.listopadu 15, 708 33 Ostrava Karel Stránský -Vysoké učení techni...
Article
Full-text available
The aim of the paper is to assess the possibility of formation of non-metallic inclusions (specifically complex sulphides) in steels in dependence on chemical composition of steels and on rate of crystallization by means of thermodynamic calculations. The original thermodynamic model is used for study of the inclusions formation. The model enables...

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