Open Access Conference Proceedings

Abstract: The paper deals with the influence of the main welding parameters of resistance spot welding on the quality of the joint. The influence of the parameters was investigated within the range of welding area where satisfactory welding is expected (according to EN ISO 14373). [..] Read more

Abstract: Speciation and speciation analysis is currently the subject of research in various domains of science and technology, such as chemistry, metallurgy, materials engineering, medicine and environmental protection, being an important factor in the material and environmental analytics development. Speciation is the occurrence of various physical and chemical forms of a given chemical element, the existence of species in tested material. [..] Read more

Abstract: The paper presents the results of mechanical properties tests at reduced and elevated temperature after a four-stage hot-rolling and cooling in water, microstructure tests and fractographic studies of breakthroughs of high-strength high-manganese steel X98MnAlSiNbTi24-11 and X105MnAlSi24-11 TRIPLEX type. In order to determine the mechanical properties of the tested steels, a static tensile test was performed, on the basis of which the yield strength, tensile strength and elongation were determined. [..] Read more

Abstract: Phase identification of corroded metal objects might be problematic because corrosion products are usually a complex mixture of different phases. Furthermore, some of present phases may be either semi-crystalline or amorphous. [..] Read more

Abstract: Compression helical springs operate frequently under varying loads and deflections. High strength steels are typically used by the manufacturers, but high UTS value should not degrade toughness and fatigue resistance, which can be achieved by control of steel composition and proper heat treatment. [..] Read more

Abstract: Reactor pressure vessel (RPV) of light water reactor and its internals are the most important components of any nuclear power plant. RPV and its internals are exposed to high temperatures, pressures and intensive neutron flux during the operation. [..] Read more

Abstract: Microalloying elements Ti, Nb, V, entered into steel they influence their microstructure and mechanical properties, because formation of carbonitrides, M (C, N), which in the high temperature inhibit the austenite grains growth and during the cooling of the austenite form fine precipitates giving the dispersion precipitation effect in ferrite. Influence of carbonitrides to the microstructure and mechanical properties depends on their basic stereological parameters: volume fraction, VV, and their size, r. [..] Read more

Abstract: Steel MLX 17 (X1CrNiMoAlTi 12-11-2) belongs to a family of martensitic precipitation-hardening steels for use in demanding applications in aviation and offshore oil and gas industry. The unique combination of high strength, toughness, fatigue strength and corrosion resistance is obtained in this steel based on 11 % Ni, 12 % Cr and precipitation hardened by Mo, Al and Ti after ageing of low carbon martensite above 500 °C. [..] Read more

Abstract: The mechanical and corrosion properties of weathering steel had been deeply studied in 70 and 80 ties of last century. In this period a lot of structure was built in the Czech Republic. [..] Read more

Abstract: The results of the structure and phase composition investigation 316L stainless steel of samples formed by selective laser melting in Mlab Cusing R (Concept Laser) equipment are presented. The physical and mechanical properties investigation was carried out by X-ray diffraction analysis, scanning electron microscopy, and micro-hardness measurements. [..] Read more

Abstract: This paper deals with the correlation of the fatigue tests results obtained on standard and miniature test samples. The aim was to compare the fatigue properties (Wöhler curves) of the samples of 15CH2NMFA steel of different cut off CT/50 test specimens after fracture toughness tests. [..] Read more

Abstract: Description of the procedure and results are given for computer simulations of small punch test (SPT) performed on P92 structural steel. The maximum force calculated using the SPT simulation is about 5% higher than the measured value. [..] Read more

Abstract: The formation of bimodal microstructure in a 316L austenitic steel subjected to large strain cold rolling and subsequent annealing and its effect on the mechanical properties were studied. The cold rolling was accompanied by the strain-induced martensitic transformation and grain refinement. [..] Read more

Abstract: The objective of this research is to investigate the effect of extension rate on tensile properties of AISI 4140 steel. The steel was supplied by local vendor in Thailand and its use for some military product. [..] Read more

Abstract: The subject of the work is to present the possibility of using a non-contact optical system for measuring strains. Dantec's multi-unit Q-400 3D image correlation system was used. [..] Read more

Abstract: Powders are nowadays used as an input material not only for conventional powder metallurgy technologies, but increasingly also for additive technologies. Powder producers usually limit their description to an average chemical composition and typical particle size. [..] Read more

Abstract: The effect of the strain rate on master curve of the martensitic chromium steel was examined. The tests were performed in both quasi-static and dynamic conditions. [..] Read more

Abstract: One method for evaluating the mechanical properties of components in operation is the use of methods that focus on the use of miniaturized test specimens. Basic properties used mostly for the service life evaluation are tensile strength, impact notch toughness or impact notch toughness transition curve, fracture toughness, creep and high cycle fatigue. [..] Read more

Abstract: The forging industry seeks ways to improve mechanical properties of forged parts without using costly alloyed steels or complicated and time-consuming post-forge heat treatment. One of the available options is Q&P processing (Quenching and Partitioning) of advanced high-strength martensitic steels. [..] Read more

Abstract: The paper concerns numerical modeling of single-side T-joint welding using the laser beam. The purpose of performed analysis is the determination of the temperature field in the welded joint, stress state and the estimation of welding deformation. [..] Read more