Open Access Conference Proceedings

Abstract: This work presents the results of plasma electrolytic hardening of steel 20Cr2Ni4A. The optimal electrolyte composition for electrolytic-plasma hardening of steels containing 20 % ​​sodium carbonate and 20 % urea has been determined. [..] Read more

Abstract: The combustion of fuels plays an important role in the field of industry and power engineering. Circulating fluidized bed combustion (CFBC) is a clean technology and also it is a convenient method of energy production from a wide range of fuels. [..] Read more

Abstract: Currently, heat treatment is the most common and effective method for changing the properties of metals and their alloys. Ferrous alloys most often are heat treated and the most commonly used process of heat treatment is the quenching. [..] Read more

Abstract: To predict kinetics of static recrystallization with account of recovery and resulting grain size in alloyed austenite, a quantitative model is developed. Physically motivated, the model relates activation energy of the process with that of bulk self-diffusion. [..] Read more

Abstract: The paper deals with the small punch testing of material properties including short-term creep resistance and microstructure analysis a thick-walled pipe made of P92 steel, where metallographic analysis revealed numerous internal defects, especially close to the inner surface of the pipe. These defects had their origin in the shrinkage porosity of the continuously cast slab and remained in the microstructure probably due to insufficient deformation during pipe rolling. [..] Read more

Abstract: Modern scanning electron microscopy (SEM) allows observations of specimens with high surface sensitivity. The surface sensitivity is significantly affected by the accelerating voltages. [..] Read more

Abstract: The possibility of laser cutting of rare-earth NdFeB permanent magnets is studied. An industrial Navigator KS-5VDM1-3 laser complex (VNITER, Russia) is used. [..] Read more

Abstract: A manufacturer of crankshafts uses steel stock purchased from several vendors. The steels differ in their behaviour during the manufacture of the crankshaft, although they are the same grade. [..] Read more

Abstract: The paper aims to demonstrate a modern scanning electron microscope (SEM) as a powerful tool for visualization of the secondary phases in TRIP steel. The TRIP steel specimens prepared by various metallographic techniques were imaged by the SEM and the secondary phases presence was confirmed by an electron back-scattered diffraction (EBSD) technique. [..] Read more

Abstract: This work focuses on the effect of laser power on the proportion of austenite and ferrite in duplex steel SAF 2507. Duplex steels combine the advantages of ferritic and austenitic steels, preferably with an optimal proportion of austenite and ferrite. [..] Read more

Abstract: More and more attention is being paid to non-destructive testing of connecting elements. Currently, ultrasound control is widely used. [..] Read more

Abstract: The NiTi alloy shape memory effect can have a much larger field of application in industry and everyday life than it is now. The high cost of obtaining this material and the laboriousness of the process limit its scope of application. [..] Read more

Abstract: The National Action Plan for the Development of Nuclear Energy in the Czech Republic envisages the preparation for the construction of two new blocks of the nuclear power plant in the location of Dukovany and the location of Temelín. Although the final supplier of these units is not clear yet, there are good prospects that some components could be produced by the local producers. [..] Read more

Abstract: Ferritic-martensitic heat-resistant steels are used for high-temperature service applications in power plants and the petrochemical industry due to its high strength and creep properties at high temperatures. After the long-term operation under, structural changes are taking place, such as coarsening of precipitates and migration of alloying elements within carbides, leading to M23C6 carbide lattice expansion. [..] Read more

Abstract: Due to the efficient combination of a forming step with a consecutive heat treatment, hot-stamping has become an established technology for the production of high strength steel parts in the automotive industry. In the beginning, sheets are heated above austenitisation temperature and held in order to obtain a fully austenised microstructure, then formed and instantly quenched in the forming tool. [..] Read more

Abstract: Due to their high tensile strengths increasing the crashworthiness of the vehicles, ultra-high strength steels are increasingly used in the automotive industry, for example in components like B-pillars or tunnel. 22MnB5 is a premier candidate for this cause, since it can be press-hardened and phase-transformed into the martensitic phase, resulting in high hardness and tensile strength. [..] Read more

Abstract: The prevention of welding distortions is one of the most important and, at the same time, most difficult issues in welding engineering. The above-named distortions result from the combined effect of the shrinkage of solidifying weld metal and the shrinkage occurring in the partially melted zone (primarily in the HAZ). [..] Read more

Abstract: The micro-alloyed steel 38MnVS6 (38MnSiVS5 or 38MnVS5) applied mostly in the automotive industry (for example production of forgings), has a high yield point and relatively good wear resistance. Aim of the study was preliminary to analyse the influence of twice the normalization process of micro-alloyed steel 38MnVS6 on its microstructure and mechanical properties. [..] Read more

Abstract: Structural steel 34CrMo4 is frequently used for producing of hydrogen cylinders. For selecting material of cylinder is very important to know fatigue and fracture behavior of material directly in hydrogen environment, especially from the point of view of safety during operation. [..] Read more

Abstract: Very popular and highly employed steel grades such as the 9 % Cr CSEF steels are limited in terms of service temperature mainly due to capping their steam oxidation resistance capabilities at temperature levels, required by the drive for efficiency increase. For heat-exchangers manufactured from conventional materials, the formation, growth and spallation of oxide scale on the steam side may eventually impair plant operations and damage other downstream components. [..] Read more