Open Access Conference Proceedings

Abstract: The paper presents the research on low-cycle fatigue of selected wrought light metal alloys, applied inter alia in the aviation technology. The material for the research consisted of hot-worked rods made of AZ31 magnesium alloy, dual-phase Ti-6Al-4V titanium alloy and 2017A (T451) aluminium alloy. [..] Read more

Abstract: The Danish coal-fired Ultra Super Critical (USC) plant, Nordjyllandsværket has now reached 100.000 hours of operation. Taking advantage of the boiler maintenance programme, tube sections were removed from more than 20 different locations in the boiler during the 2012 summer shutdown to assess the materials conditions of the boiler. [..] Read more

Abstract: The paper below presents the results of studies of the flexible SuperCor SC-57S structure built by Polish manufacturer ‘ViaCon Polska Sp. z o.o.’ at their test site in Rydzyna. [..] Read more

Abstract: This article presents a method for software assessing the level of axial segregation in wire rod. This so-called axial segregation is routinely determined visually as dark spots on the etched cross-section of wire, which classifies comparison to a etalon. [..] Read more

Abstract: It is a common practice to use automated software tools to identify material properties values in dataset recorded during the tensile tests. Our work is a comparative study how different numerical algorithms affect resulting material properties values. [..] Read more

Abstract: Oxide-dispersion-strengthened steel (ODS) MA957 has been studied as a candidate material for Tritium Breeding Blanket for fusion reactors with helium coolant, where temperatures 250–650 °C are expected. Helium is one of type as primary coolant in High Temperature Reactor and Gas Cooled Fast Reactor with working temperature 5001000 °C.This work presents results of the study of behaviour of ODS (MA957) under influence of high temperature helium environment. [..] Read more

Abstract: Pitting is a type of fatigue wear of the material subjected to cyclic loading, especially occurring in the gears or bearings. Si-DLC coatings are currently used due to their excellent properties such as low friction coefficient, high hardness, and wear resistance. [..] Read more

Abstract: It is generally recognized that the high content of non-metallic inclusions in structural steels alter their physical and mechanical properties. Formation of non-metallic inclusions is a complex phenomenon that depends on the composition, pressure and temperature of the working media. [..] Read more

Abstract: A creep damaged area was found during the routine control of the steam pipeline bend of 200 MW fossil-fuelled power plant boiler close to the outer fibre and near the top of the bend. The damaged area with identified creep cracks was about 250 x 600 mm in size and the maximum depth of the cracks was 7 mm. [..] Read more

Abstract: From the economic reasons many products originally made from austenite stainless steel are nowadays made from ferritic stainless steel. Ferritic steels have relatively low yield strength and the work hardening is limited. [..] Read more

Abstract: The cavitation erosion resistance of the stainless steel was studied with ultrasonic vibration equipment, at a frequency of 20 kHz and oscillation amplitude of 50 μm. Varying the holding duration at the constant heating temperature, causes changes both in terms of the not dissolved austenite, chemical compounds (carbides, inter-metallic phases), phases proportion, as well as in the size of the crystal grains.The cavitation test results were compared with those obtained by the standard OH12NDL steel used in the manufacturing of hydraulic turbine blades Kaplan of the Power Plant Iron Gates I, Romania. [..] Read more

Abstract: This paper analyses the effect of work hardening on the behaviour to cavitation erosion for the low alloyed steel 16MnCr5.Cavitation tests were conducted on a vibrator device with piezoceramic crystals, which fully complies with the requirements imposed by the ASTM G32 – 2010.The evaluation of behaviour at cavitation erosion was made based on curves gradient of hardness on the section of layer hardened by cold plastic deformation, as well as the variation curves of cavitation parameters MDE (depth of penetration of erosion) and MDER (penetration rate of erosion) with the duration of test. The topography of surfaces damaged by cavitation and the structural changes resulting in marginal layer were analysed with light microscopy and scanning electron microscope, they justified the significant increases of resistance to cavitation erosion.. [..] Read more

Abstract: The objective of design of quenching is to estimate the results of quenching, concerning mostly with the estimation of microstructure and mechanical properties. For the simulation of specimen cooling which is thermos-dynamical problem, it is necessary to establish the appropriate algorithm which describes cooling process, and to accept appropriate input data.Microstructure composition and hardness will be defined by kinetic equations of prior microstructure decomposition, based on time of cooling from 800 to 500 °C, which is relevant to microstructure transformation. [..] Read more

Abstract: The paper analyses the structural modifications occurred in the welded joints from a Duplex stainless steel, delivered in solution annealed state in form of sheet with 12 mm thickness. As filler material it has been selected an electrode wire E 2209-16 with a diameter of 1.2 mm, which has a higher Ni content (8-10 %) compared to the base material (4.5-6.5 %) in order to promote the formation of austenite and to induce in the weld approximately equal proportions of ferrite and austenite.Also are capitalized the benefits of the pulsed current arc-welding regarding the precipitation reactions limitation of the intermetallic phase σ and of the nitrides in weld and heat affected zone (HAZ) which can affect both corrosion resistance and toughness.. [..] Read more

Abstract: This article deals with the new results from measurement of mechanical properties of P92 welded joints. Tested specimens (welded joints of P92 steel) were prepared using GTAW technology (141). [..] Read more

Abstract: Steel, which was designated to process as high-grade and hardening of surface was investigated from the point of views of magnetic and transport properties. The aim of this study is to describe the magnetic behavior, electrical resistivity and thermal conductivity of this material in case that it is applied for the components of magnetic circuits or some parts in an electrical equipment. [..] Read more

Abstract: Our research is focused on the changes in thin surface layer of the brake disk due to the impact of severe plastic deformation and heating by friction process. The aim of this study is to compare structure, chemical and phase compositions of the surface layer in depth up to several hundreds of nanometers in the no affected central part of brake disk and the part which was in contact with brake pads by braking. [..] Read more

Abstract: The heat treatment process of ductile iron involves two stages: austenitising at temperatures in the range of 850-950oC with the following austempering of alloy in the temperature range of 250-380oC. The resulting microstructure contains ferrite saturated with carbon in a matrix of reacted high-carbon austenite with spheroidal graphite typical of ductile iron. [..] Read more

Abstract: The paper presents the results of microstructure examinations of ductile iron with the additions of Ni, Cu and Mo. TTT diagrams - illustrating the range of phase stability as a function of the time of isothermal annealing at a given temperature, and CCT diagrams - illustrating the range of phase stability during continuous cooling at a predetermined rate were developed.. [..] Read more

Abstract: Cr3C2-NiCr, Cr3C2-CoNiCrAlY, TiMoCN-Ni (experimental coating), Stellite 6, NiCrBSi and Hastelloy C-276 coatings were deposited on substrate material Wr.Nr. 1.4923 (X22) which is in nitrided state used as an effective constructional material for components in power equipment. [..] Read more