Open Access Conference Proceedings

Abstract: The article deals with the design of a vehicle dismantling component. It is the front axle of the SUV, with a 4 x 4 drive produced by Brembo. [..] Read more

Abstract: The paper deals with the effect of heat treatment parameters on mechanical properties and microstructure of low alloy high-strength steel 55 Cr3. The material standard of this steel defines the hardening temperature interval from 830 to 850 °C, which brings about the question of minimum soaking time in order to dissolve carbide particles and to homogenize austenite before quenching. [..] Read more

Abstract: The paper deals with the possibility of using the SPT - (small punch test) method for evaluation of material properties of the individual areas of welded joints. The homogeneous and heterogeneous welds for USC power plants were assessed. [..] Read more

Abstract: The aim of this work is to develop and test a new method for identification of material properties of the steel. This work deals with application of the small punch test for evaluation of material degradation of power station in the ČEZ company (main Czech energetic company) 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: The intended operation time prolongation of the key components of fossil-fuelled power plants working in the creep conditions over 200,000 or even 250,000 hours (far beyond their original design lifetime) must be accompanied by thorough and extensive monitoring of the current material state and particularly creep damage. The extent of cavitation damage is routinely tested in-situ by using replica method and its quantification is based on a practice stated in VGB-TW 507, NORDTEST NT TR 170 or NORDTEST NT TR 302 that further develop the original Neubauer's classification. [..] Read more

Abstract: The paper presents results of studies on the crystallite sizes of oxide layer formed during a long-term operation on 13CrMo4-5 steel at an elevated temperature (T=470oC, t=190,000h). This value was determined by a method based on analysis of the diffraction line profile, according to a Scherrer formula. [..] Read more

Abstract: Cold drawing of steel tubes is the manufacturing process characterized by anisotropic material flow during drawing. In this paper, the microstructural of the E235 hot rolled steel tube after normalizing and cold drawing were characterized by optical microscopy, EBSD (Electron BackScatter Diffraction) analysis performed on scanning electron microscope. [..] Read more

Abstract: The development of Generation IV nuclear reactors and accelerator driven systems (ADS) is supporting a wide range of work on the compatibility of stainless steels with heavy liquid metals (HLM).The austenitic steel DIN 1.4970 (also known as 15-15Ti) is being qualified for use in heavy liquid metals because of its lack of sensitivity to Liquid Metal Embrittlement. The aim of this study is to look into cracking modes and their main characteristics in order to reach a clear idea of mechanisms.Flat tensile, tapered specimens were loaded in PbBi at 300 °C with low oxygen content and, for comparison in air, up to the Ultimate Tensile Stress, UTS, point and rupture. [..] Read more

Abstract: In this paper we present a mathematical model for evaluating the Lankford coefficient (LС) in automotive sheet steels as a function of the ferrite grain size after hot rolling, the degree of cold rolling reduction, the chemical composition, and the volume fractions of perlite and bainite in the final structure. Empirical parameters values of the model were determined using the experimental data base on average LC in 138 strips of 13 steel grades, produced at PJSC Severstal, with a significant range of chemical composition variation. [..] Read more

Abstract: This work deals with the influence of hydrogen on the mechanical properties of TRIP 780 type C-Mn-Si steel. Tensile test bars were hydrogenated in 0.1N sulfuric acid solution with the addition of KSCN during the slow strain rate tensile tests (SSRT). [..] Read more

Abstract: The article presents the results of corrosion tests of multi-groove pads made with the MIG method on a C45E steel substrate. The process of welding the multi-groove pads was carried out with constant parameters of the pad-welding process (i.e. [..] Read more

Abstract: High strength multiphase TRIP steels are very often used as structural materials, especially in the automotive industry. Due to their ability to absorb energy during the impact, they are used for safety components of the car body. [..] Read more

Abstract: The paper focus on possibilities of imaging microstructure changes in high strength low-alloyed carbon steel using an in-situ tensile stage placed in scanning electron microscope (SEM). The sample can be observed either in secondary electrons (SE) or by electron backscattered diffraction (EBSD). [..] Read more

Abstract: The paper deals with the corrosion behavior of steels with reduced effective chromium content in the matrix, with the intent to estimate their long-term behavior in low aggressive environments, typical for the secondary and primary circuits of nuclear power plants. Materials for this research were steels with varying characteristics of influence of effective chromium content precipitation of chromium carbides or spinodal breakdown of chromium / martensitic steels, creating other types of chromium-rich phases, e.g. [..] Read more

Abstract: Electron beam (EB) welding of thick materials is not an easy task and finding the correct welding parameters and conditions is one of the crucial factors especially when the quality of weld root is required. The undesirable features of an electron beam weld can lead to premature failure or reduces the effectiveness of the resulting components (for example impellers). [..] Read more

Abstract: Non-seismically designed existing reinforced concrete (RC) structures are susceptible to any thermal effect. Indeed, difficulties arise even more in understanding the performance of buildings in fire due to the inherent complexity in the behavior of composite materials at elevated temperatures. [..] Read more

Abstract: In this study the effect of notch angle on fracture toughness (KIC) of AISI 4340 steel is investigated by using circumferentially notched bar method. The specimens have three different notch angles 45°, 60°, 75° and specimen diameters (D) – notch diameters (d) ratio (D / d) keep constant as 1.2. [..] Read more

Abstract: The effect of heat treatment on the microstructure and mechanical properties of a (in wt. %) 10 Cr-3Co-3W-0.2Re martensitic steel was investigated. [..] Read more

Abstract: The Inconel 617 alloy is used in the construction of boiler pressure elements with ultra-supercritical performance parameters. The paper presents the results of microstructure testing after 10,000 h ageing at 750 °C. [..] Read more

Abstract: Resistance spot welds (RSW) are one of the main joining technologies of thin plates in automotive industry. Key factors affecting the strength of the RSW joint are the nugget diameter, asymmetry, expulsions, intended surfaces, and presence of cracks. [..] Read more