Open Access Conference Proceedings

Abstract: In MATERIAL AND METALURGICAL RESEARCH LtD. we made a proposal, manufacturing and verification of oxygen-nitrogen nozzle. [..] Read more

Abstract: The paper deals with the study of key thermophysical properties - phase transition temperatures (liquidus, peritectic transformation and solidus) with use of DTA (Differential Thermal Analysis) and “direct” thermal analysis (TA). Results obtained with these two very often used methods at heating and cooling process are presented. [..] Read more

Abstract: Optimal regulation algorithms and complex numerical simulations are utilized in contemporary production processes. High quality of products, minimum of scrap, and reduction of carbon footprint are current trends in industry processes including the continuous casting process of steel. [..] Read more

Abstract: The spray cooling is a common cooling method in the steel industry (continuous casting, hot rolling, product cooling or heat treatment). The water is sprayed on the hot surface by the nozzle which transforms the water stream into droplets. [..] Read more

Abstract: Vacuum metallurgy processes are now the primary processes of manufacturing new metallic materials. Requirements concerning product purity and accuracy in determining chemical composition constitute a huge challenge arising from the needs of new technologies. [..] Read more

Abstract: Three alloys based on Fe-C-Cr were studied. These alloys contained carbon in a range of 0.31 – 0.38 wt.% and chrome 1.06 – 4.99 wt.%. [..] Read more

Abstract: In the framework of optimising, correct setting of the casting process, knowledge of solidus temperature (TS) and especially liquidus temperature (TL) of produced steel grade is necessary. There are options to determine these temperatures: the use of empirical equations or calculations by specialised programs (thermodynamic databases). [..] Read more

Abstract: Microsegregation in general is the consequence of the different solubility of alloying and residual elements in liquid and solid steel. The result is an enrichment of segregating elements between the dendrites due to incomplete diffusion equalization. [..] Read more

Abstract: In the secondary cooling zone of the continuous casting process water-air nozzles are used to cool down the strand. The cooling has to be sufficient enough to ensure a certain shell thickness and finally the complete solidification of the material. [..] Read more

Abstract: Experimental and theoretical investigation of temperatures of phase transformations (temperature of liquidus TL, temperature of peritectic transformation TP, temperature of solidus TS, temperature of the end of αγ transformation Ac3, and temperature of the start of eutectoid transformation Ac1) of these alloys were experimentally measured. All investigated temperatures were also calculated by Thermo-Calc software. [..] Read more

Abstract: This contribution deals with an unconventional way of connection of steel pipes with a thin wall. In the introduction, it is described by one of the methods of electromagnetic forming tubes. [..] Read more

Abstract: Slab thermal homogenization during reheating in furnace is temperature and retention time dependent. Dissolution of microalloying element like niobium in austenite at soaking temperature is important to achieve desired strength and toughness in final rolled product. [..] Read more

Abstract: The evolution of the new microstructures produced under hot deformation conditions is reviewed. The Finite Element Method (FEM) and Experimental Planning Method (EPM) has been used for the examination of the combined effect of the temperature-strain-time parameters of structural and stainless steels during rolling and forging metal forming technique. [..] Read more

Abstract: The article presents results of conducted analyzes and laboratory experiments. During the forge tests a large amount of scale was observed during the forging process. [..] Read more

Abstract: Heavy seamless tubes are produced by the Big Mannesmann Rolling Mill in Třinecké železárny plant. Their final microstructures and properties are not only given by steel chemistry, they are also largely influenced by cooling conditions after finish-rolling. [..] Read more

Abstract: With using of tension tests, which were performed on universal plastometer Gleeble 3800, the influence of grain size on hot formability medium-carbon steel was investigated. From investigated steel were prepared 2 sets of samples, while the booth sets were made from the same melt. [..] Read more

Abstract: Transformation kinetics of austenite during cooling is influenced by several factors as chemical content or thermomechanical parameters (temperature, dwell time, deformation, strain rate, cooling rate) and initial structure state, consequently initial austenite grain size. The aim of this article was just to assess the effect of initial structure state (casted, deformed, purposely extremely coarsened) on transformation kinetics of austenite during cooling of steel C10, which was moreover deformed uniaxial compression. [..] Read more

Abstract: In this study, the evolution of some properties of the wire drawn alloy AGS 6101 will be followed and the effect of a heat treatment at high temperature will be analyzed.OM (optical microscopy) and SEM (scanning electron microscopy) observations showed an homogeneous fibrous microstructure in the longitudinal cross-section. However, the EBSD (electron backscatter diffraction) analysis showed that the distribution of the two main crystallographic fibers <111> and <001> was not homogeneous through the cross-section of the wire. [..] Read more

Abstract: High strength properties and a wide range of deformation hardening, particularly in case of dynamic deformation, enable application of manganese steels in the structure of highly strained elements constituting mechanical vehicle framework. This is true primarily for railway, automotive and military industries, where not only decrease in weight, but also safety improvements are of importance. [..] Read more

Abstract: Forming limit diagrams (FLD) are used to determine process limitations in sheet metal forming, i.e. as a level of formability assisting in the estimation of stamping characteristics. [..] Read more