Open Access Conference Proceedings

Abstract: The project MPO FR-TI3/458 "Material solutions for industrial equipment working with ultra-preheated steam", is focused on the assessment and prediction of long-term creep life of heterogeneous and homogeneous weld joints of the selected materials that can be used for superheaters and re-heaters of newly built or refurbished power plant boilers. The acquisition of detailed and reliable information, especially about the behaviour of weld joints exposed to high temperatures and pressure during long-term operation is of vital importance. [..] Read more

Abstract: The corrosion resistance of three grades of valve steels (X33CrNiMn23-8, X50CrMnNiNbN21-9, X53CrMnNiN20-8) in combustion gases of propane-butane (LPG) under thermal shock conditions has been studied. It was stated that X33CrNiMn23-8 steel, containing highest concentration of chromium and nickel and also the lowest of manganese concentration, showed the best corrosion resistance in comparison to another tested steels. [..] Read more

Abstract: The article describes an example of the numerical determination of the mean void nucleation strain which is the basic parameter of the Gurson-Tvergaard-Needleman (GTN) porous material model. The investigation was conducted for S355 steel, commonly used in civil engineering. [..] Read more

Abstract: The corrosion resistance of widely used X50CrMnNiNbN21-9 high-alloyed austenite valve steel, in three different combustion gases have been compared. The comparison was performed on the basis of results of kinetic corrosion of the tested steel in combustion gases from propane-butane, gasoline with 5 and 10 % of ethanol additives (v/v) and fuel oil with 5 and 10 % of FAME additives (v/v). [..] Read more

Abstract: The physical and chemical reactions that occur in the process of steel melting and solidification produce non- metallic compounds and phases, referred to as inclusions. The quantity of non-metallic inclusions is correlated with the content of tramp elements in the alloy, while their phase composition and structure, in particular shape, dimensions and dispersion, are determined by the course of metallurgical processes. [..] Read more

Abstract: The paper deals with the study of latent heats of melting and solidifying of real steel grades. Two real steel grades were investigated and values of latent heats of melting and solidifying were obtained. [..] Read more

Abstract: The results of a microstructure analysis and hardness investigations of the hypoeutectoid steels with 0.3 %Mo, imitating by its chemical composition toughening steels, are presented in the paper. The methodology of a dilatometric samples preparation and the method of the critical points determination were described. [..] Read more

Abstract: This paper deals with welded joints carried out by 111 (MMAW) and 141 (GTAW) welding method on the P92 steel. With respect to the small size of each region in the heat-affected zone (HAZ), the suitable simulation technique for estimation of the microstructure and properties needs to be prepared. [..] Read more

Abstract: The balance between strength and toughness of supermartensitic steels can be controlled by heat treatment parameters. Quality heat treatment usually consists of quenching and single or double tempering above the Ac1 temperature. [..] Read more

Abstract: Supercritical water (SCW) is a promising medium with a broad spectrum of potential applications in the industry. However, the absence of appropriate structural material able to withstand the severe corrosive conditions of SCW still limits its utilization. [..] Read more

Abstract: The results of studies of the influence of intercritical annealing parameters on the austenite formation and its stability in TRIP steel (0.41 % C, 1.52 % Mn and 1.22 % Si) were presented in the paper. Based on the results of a dilatometric analysis and metallographic investigation it was noted that the pearlite to austenite transformation does not occur at a constant temperature, which is referred to as Ac1, but rather within certain - possible to determine - temperature range which is enclosed within Ac1s and Ac1f values. [..] Read more

Abstract: The hereby work presents the influence of the retained austenite volume fraction on the phase transformations during tempering. Two different austenitising temperature 830 and 1050 °C were selected. [..] Read more

Abstract: The phase transformations which occur in 38CrAlMo6-10 steel were analysed at various temperatures, particularly in the intercritical Ac1-Ac3 region, by means of computer simulations and by dilatometric tests. In the study, the effects of heat treatment conditions in the intercritical region on the martensitic and bainitic transformations and on the Ms temperature were investigated. [..] Read more

Abstract: This study describes modelling of the processes of steel hardening. The first priority was given to thermal phenomena, phase transformations in solids and mechanical processes. [..] Read more

Abstract: This work concerns numerical modelling of laser butt-welding of T-joints, made of S355 steel. Numerical analysis of thermomechanical phenomena is performed in ABAQUS FEA engineering software. [..] Read more

Abstract: In recent years, the intensive research work has been carried out on the development of heat treatment which allowed obtaining carbide-free microstructures with retained austenite. These include the quenching with isothermal annealing (austempering) leading to obtain a nanocrystalline bainite [1,2] and Quenching&Partitioning (Q&P) [3] leading to obtain a microstructure composed of carbon-depleted martensitic matrix and carbon-enriched retained austenite. [..] Read more

Abstract: Fatigue in Cr-Mo steel, JIS SCM435, candidate for use in fuel cell vehicles is investigated at different test frequencies in two groups of hydrogen charged and uncharged specimens under tension-compression fatigue and stress ratio R = −1. Specimens are machined in hour-glass shape with artificial hole from which initial cracks start their propagation. [..] Read more

Abstract: This paper describes the fatigue properties of the steel P92. This material is widely used in the energy industry, especially for pipes and pipe bends of supercritical steam turbines. [..] Read more

Abstract: In the work the results of plate rolling process of the experimental steel designed for plate which meets the requirements for grade X80÷X100 according to API5L were presented. The simulations were carried out using laboratory stand mill duo 300. [..] Read more

Abstract: The subject of this study is the temperature stability of a microstructure in X37CrMoV5-1 hot-work tool steel. Conventionally treated by quenching and high-tempering this steel is used for tools working at temperature up to 550 °C. [..] Read more