Open Access Conference Proceedings

Abstract: 16Cr - 2Ni - Mn - Mo - xN (wt%) stainless steel powders were synthesized by mechanical alloying (MA) of elemental powders, metal nitride (MeN) powders and nitrogen-containing ferroalloy (FeMeN) powders at argon atmosphere. The microstructural and phase evolution of the powders at different times of alloying and microstructure were studied. [..] Read more

Abstract: This paper is focused on the modelling of the heat-affected zone of steel P92 during one layer TIG (141) welding. Simulation of the heat-affected zone (HAZ) was performed on the thermal cycle simulator of its own design. [..] Read more

Abstract: 16Cr - 2Ni - Mn- Mo - xN (wt.%) stainless steel powders were synthesized by mechanical alloying (MA) of elemental powders and nitrogen-containing ferrochrome (FeCrN) powders alloy. Compaction of resulting powders was carried out using spark plasma sintering (SPS) technology.The microstructural and phase evolution of the powders at different times of alloying, microstructure, phase composition and mechanical properties after SPS were studied. [..] Read more

Abstract: This paper deals with effect of long-term exploitation on structure and mechanical and fracture properties of X20CrMoV11-1 grade steel. Mechanical properties were evaluated both using standard test specimens and small punch test (SPT). [..] Read more

Abstract: One of the main concern in the development of the Gen IV lead-cooled fast reactors (LFRs) is the compatibility of the candidate structural steels and cladding materials with the heavy liquid metal (HLM). Structural materials compatibility in conditions relevant to plant operation is of primary importance to safety. [..] Read more

Abstract: This work summarizes results and progress in new method development for identification of material properties of steel. This work deals with application of the small punch test for evaluation of material degradation of power station in the Czech Republic within the project TE01020068 “Centre of research and experimental development of reliable energy production, work package 8: Research and development of new testing methods for evaluation of material properties”. [..] Read more

Abstract: Residual lifetime estimation and early detection of possible risks of mechanical equipment failure and structures is a key question for reliable operation of industrial plants. Currently, this issue is particularly critical in power stations that are approaching their designed lifetime. [..] Read more

Abstract: The paper deals with the effect of high-pressure hydrogen on fatigue crack growth rate of low alloy 34CrMo4 steel used for hydrogen cylinders production. Testing was performed on pre-cracked 1/2 C(T) specimens, which were dynamically loaded both in the air and in pure hydrogen environment at pressure 15 MPa. [..] Read more

Abstract: 9-12% Cr martensitic steels are used as materials for fossil power plants with steam temperature more than 600 °C. Superior creep strength of these steels is attributed to a dispersion of nanoscale boundary M23C6 carbides and Laves phase particles. [..] Read more

Abstract: Press hardening is a modern forming technology for the production of shaped sheet parts. Its use has been growing in recent years because of its high production accuracy, reduced spring back effect and lower forming forces. [..] Read more

Abstract: The application of new materials in the power units of new generation, which are able to work at ultra-supercritical parameters of steam (T ≥ 620-650 °С, Р = 25 - 35 MPa), can increase their efficiency up to 41-44 % and decrease the amount of harmful emissions. The aim of the present research was to investigate the major structural changes in new Re-containing steel during ageing at temperature of 650 °C. [..] Read more

Abstract: All metal products that operate under high loading conditions are subject to wear over time. Therefore, there is a need to restore the geometric shape of the working parts after the consumption of the product life. [..] Read more

Abstract: At present time is increasingly applying 3D printing methods in the area of production of metallic materials also. 3D printing is use for serial and individual unit production in the aerospace, automotive and medical applications (prosthetics, implants, etc.). [..] Read more

Abstract: Resistance spot welding is one of the most used welding technologies for joining of thin, deep drawn steel sheets in automotive industry. The condition of electrodes may have significant impact on the resulting weld quality, therefore it is necessary to check the electrodes´ wear that otherwise may cause creation of specific defects in the weld joints. [..] Read more

Abstract: Low carbon low alloyed TRIP steel with partial substitution of silicon by aluminium was thermo-mechanically treated to obtain a multiphase microstructure typical for TRIP steels. The processing consisted of soaking at 900°C and two compressive deformations applied during the cooling to the isothermal hold temperature of 425°C. [..] Read more

Abstract: Using X-ray diffraction analysis, scanning electron microscopy and magnetic properties analysis the Sm2Fe17 compound nitrides after severe plastic deformation by torsion at a temperature of 77K were studied. It was shown that severe plastic deformation led to the structure refinement without the formation of new phases. [..] Read more

Abstract: The susceptibility to hydrogen embrittlement of a dual-phase steel DP600 with ferritic-martensitic microstructure was studied on previously hydrogenated samples by slow strain rate tensile tests (SSRT). The samples were subjected to electrolytic hydrogen charging in 0.05M sulfuric acid solution with the addition of KSCN at a current density of 1 and 5 mAcm-2 during 4, 8 and 24 hours. [..] Read more

Abstract: There are high demands placed on ensuring the integrity when building blocks of fossil power plants with USC steam parameters. Weld joints are critical parts of fossil power units. [..] Read more

Abstract: Thermal annealing is a proven material treatment method applicable to WWER type reactor pressure vessels with the aim of prolonging their operational lifetime. However, reactor pressure vessel internals of nuclear power plants are exposed to more severe operating conditions (high pressure and temperatures, higher neutron flux, corrosion environment), which cause gradual degradation of their mechanical properties. [..] Read more

Abstract: Each metal is characterized by its typical stacking-fault energy (SFE). The higher this energy is, the less often are stacking errors in the crystal lattice. [..] Read more