Open Access Conference Proceedings

Abstract: An investigation of the dependence of grains hardness on their orientation in electrical steel is presented in the present work. The study was performed by means of nanoindentation experiments using Nanoindenter G200 with the calibrated Berkovich indenter. [..] Read more

Abstract: Mini-thixoforming is a method of processing metals at temperatures between the solidus and liquidus. Thanks to the small volume of feedstock, it allows very rapid heating and solidification rates to be achieved with great accuracy. [..] Read more

Abstract: Carburization, followed by quenching and tempering, is commonly used process to increase hardness and wear resistance of low carbon steels. Such process, besides improving mechanical properties and performance of steel surface, may cause however undesirable side effects such as: increased residual stress in surface layer, distortion of heat treated element or even initiation of cracking. [..] Read more

Abstract: Magnetic properties (easy magnetisation, low hysteresis losses) of grain oriented electrical steels (GOES) depend strongly on the sharpness of the Goss texture ({110}<001>). It is expected that the perfection of the Goss texture in final sheets is significantly affected by structural inheritance during the industrial production process. [..] Read more

Abstract: Heat capacity of steels is one of the crucial thermophysical parameters used for process behaviour prediction in many applications. Heat capacity is an input variable for many thermodynamical and kinetic programs. [..] Read more

Abstract: Dynamic tensile testing of structural materials is becoming more and more important due to the need to obtain relevant data for components design mostly with the use of FEM in many industries such as automotive and power industries. The difference of the material behaviour under dynamic loading and quasi-static loading is that the dynamic strength or yield stress usually increases as the strain-rate increases. [..] Read more

Abstract: Mathematical models of the mechanical properties for steels with a complex microstructure are presented. These models are a component of a recently developed integral hot rolling model for mill 2000 of SEVERSTAL (STAN 2000), along with the models for predicting austenite microstructure evolution under hot rolling and its transformation during subsequent cooling. [..] Read more

Abstract: In the past, V-ROL N steel, produced at Poldi Kladno, was used for many years for a manufacture of aircraft undercarriages, particularly for quite famous small aircraft L 410. As a result of privatisation process in the nineties and other circumstances, the V-ROL N steel, known by its very good or even excellent properties, has not been more available. [..] Read more

Abstract: Secondary phase’s precipitation is dangerous for stainless steel. The most important secondary phases for stainless steels with carbon amount higher than 0.2 % are carbides (especially M23C6). [..] Read more

Abstract: The reason for writing this paper was to describe the kinetics of phase transformation of undercooled austenite in the form of the CCT (Continuous Cooling Transformation) diagram as well as the kinetics phase transformation during heating from as-quenched state in the form of the CHT (Continuous Heating Transformation) diagram of the new hot work tool steel. In order to make the CCT diagram of the kinetics of phase transformation of undercooled austenite the samples were heated to a temperature of 940°C with a rate of 5°C/s, hold for 20 minutes and then cooled with various rates (50÷0.02°C/s) to a temperature of 20°C. [..] Read more

Abstract: Oxidation is inherent part of steel production and heat treatment. The most common impact of the oxide scale layers is on the surface quality and material losses during steel processing. [..] Read more

Abstract: It is possible to successfully propose the physical-metallurgical and structural conditions for the equilibrium between steel strength and toughness by designing structural parameters which have a positive effect on the relation between local and macroscopic fracture processes. In carbon steels and microalloyed steels for a wide range of technical uses, whose structure after heat treatment consists of a basic matrix of tempered lower bainite with precipitated carbides and sometimes other types of inclusions, toughness is dependent primarily on the size distribution of second phase particles, their volume ratio, and also the strength of the matrix/particle phase boundary and the mechanical properties of structural phases. [..] Read more

Abstract: The manufacturing program of the company VÍTKOVICE HEAVY MACHINERY a.s. comprises production of a wide range of structural steels for the high exposed machine parts, such as shafts of wind power stations, turbine shafts, gears, etc. [..] Read more

Abstract: Austenitic steels with 20-30 % Mn, and 5-10 % Al have a high level of toughness and ductility in comparison to carbon steels, used for construction of vehicles. The corrosion behavior of those steels can be negatively affected by a high manganese content, which is electrochemically non-noble element and supports certain types of localized corrosion. [..] Read more

Abstract: Fatigue in stainless steel-candidates for hydrogen storage and infrastructure is described mathematically at different loading conditions. The investigated steels are: SUS304, SUS316 SUS316L and SUS405. All the tests are carried out under tension-compression fatigue at different loads and a stress ratio R= −1. [..] Read more

Abstract: The level of fatigue damage in railway wheel sets is one of limited parameters of rail vehicles reliability. Then new design methods of axles improving fatigue strength, is proposed. [..] Read more

Abstract: The microstructural evolution of a low-carbon steel has been studied during the austenite decomposition, subsequent to initial martensite formation. Isothermal holding treatments after rapid cooling to various temperatures between martensite start (Ms) and martensite finish (Mf) temperatures were carried out in a dilatometer with the intention to form controlled volume fractions of initial martensite and austenite. [..] Read more

Abstract: Paper presents the results of investigation regarding the influence of additional processing after oxy-acetylene cutting on the structure and corrosion resistance of the zinc coating. Research was focused on fittings for overhead power lines – a double eyes links type SLINK. [..] Read more

Abstract: Infections caused by bacteria or fungi is a serious health worldwide problem. In order to disinfect the inside of the ambulance very strong disinfectants are used - they can also promote the growth of fungi and increase the threat of infections induced by them. [..] Read more

Abstract: Process stability is essential to produce high quality homogeneous zinc coatings at continuous galvanizing lines. In order to be able to predict the zinc film thickness after gas jet wiping, the adhered film thickness and its formation before the wiping process has to be known. [..] Read more