Open Access Conference Proceedings

Abstract: Work deals with phase formation of eight high entropy alloys of FeCuxCr1-xMnNi type and of three alloys of FexCuCrMnNi system with high entropy effect. Predicted compositions of phases using Ni and Cr equivalents and by use of valence electron concentration are compared with real finding of presented phases in all aforesaid systems. [..] Read more

Abstract: Samples made of nodular cast iron FGN 400-15 have been heat treated by oil quenching from 850 °C followed by tempering at 450 °C. The objective of the paper aimed the microstructure modification and improvement of the mechanical properties and wear resistance by cavitation. [..] Read more

Abstract: The most negative effect of cavitation is the destruction of the solid surface by micro-jets impact or shock waves generated by implosion or explosion of cavitation bubbles. It is present in all hydro-mechanical equipment where the pressures fluctuate which lead to the appearance and development of these bubbles, as a result of the flow section changing.The paper analyses the behaviour and resistance to vibrating cavitation of grey cast iron with pearlite microstructure, used for manufacturing of components and shutters valves with metal-metal sealing. [..] Read more

Abstract: Using pulsed current at manual metal arc welding represents a new research idea perspective and provocative for major manufacturers of welding equipment. The concept is based on the ability to control the volume of welding pool at low frequencies of the pulses, below 5 Hz.Experimental research underlines the beneficial influence of pulsed current welding on weld geometry for butt joints. [..] Read more

Abstract: A use of selected steels in the industrial practice is very important and frequent and this is the reason why it is necessary to know their qualities not only from the standpoint of material, but also regarding its machinability with the aim to gain a product of a fine quality in optimal economic conditions. Machinability was compared in cases of steel 100Cr6 and steel C56E2 directly in the production process by means of experimental verification of deterioration of cutting materials, measurements of dynamics of a cutting process, evaluation of macrostructure and quality of surface layers.. [..] Read more

Abstract: The steels with high chromium content are known to suffer embrittlement at elevated temperature induced either by decomposition of the microstructure into two arranged solid solutions α+α´ (embrittlement at 475 °C) or by precipitation of chromium-rich brittle phase . Martensitic precipitation hardening steels belong among materials having chromium content close to the minimum embrittlement concentration and in some circumstances there could be possibility of prolonged exposure of these steels at elevated temperatures. [..] Read more

Abstract: The purpose of the paper was to analyse the effect of diverse heat treatment parameters (normalising and tempering) on mechanical characteristics of 508 x 20 x 90° tube bends made of the 10CrMo9-10 steel manufactured by bending with local induction heating. The research comprised tests of basic mechanical properties and creep at the temperature of 500 °C. [..] Read more

Abstract: The newly developed grades of austenitic heat resistant steels (Super 304H, HR3C, TP 347 HFG) exhibit superior corrosion resistance in steam as well as creep strength thanks to their fine-grained microstructure, especially in case of Super 304H and TP 347 HFG. They are worldwide used in USC power plant boilers and substitute steels AISI 316, AISI 321 and/or AISI 347 formerly used in superheater and reheater tubes. [..] Read more

Abstract: TRIP (transformation induced plasticity) steel are modern structural materials which are currently mainly used in an automotive industry. The processing of these steels utilize an effect of transformation induced plasticity resulting in good mechanical properties – high strength (up to 1200 MPa) and formability (around 35 %). [..] Read more

Abstract: New wear-resistant special cast iron CHMN-35M was produced to be used for parts which are operated under the conditions of intense friction loads. Based on obtained results, technical requirements by chemical compounds and mechanical properties were determined. [..] Read more

Abstract: Resistance spot welding of deep drawing steel DC06 is done and influence of welding parameters on spot weld quality is evaluated. Modern thermography methods are used to evaluate quality of the spot weld and its results are compared with standardly used methods. [..] Read more

Abstract: In the automotive industry, sheets are coated for protection against corrosion and oxidation during forming. This coating may deteriorate the weldability of steel sheets and shorten the life of welding electrodes. [..] Read more

Abstract: This article discusses experimental results obtained for elements made of a wear - and abrasion-resistant steel, Hardox400, finished using a non-conventional method. The analysis focused on the relationship between of the tumbling time and the radius of rounding. [..] Read more

Abstract: Extending the application area of Duplex stainless steels has led to the necessity of creating components or structures made of dissimilar materials. Due to the differences in the microstructure, the welding of the dissimilar steels is more difficult than that of similar steels.The research carried out in the current paper focuses on the particularities of completing the heterogeneous welded joints between a Duplex stainless steel and a Cr-Mo low alloy steel using as additional material an electrode wrapped in E 309MoL – 16, which contains approx. [..] Read more

Abstract: This paper addresses the FEM numerical analysis of thermal field distribution in a thin-walled aluminum alloy pipe subjected to circumferential welding with a laser beam as a source of heat. The paper presents constitutive equations describing the studied phenomenon. [..] Read more

Abstract: The compression strength is well characterized by the ability to transfer compressive stresses through porous materials. It can be determined by examining the material on the endurance machine in a single-axis compression test. [..] Read more

Abstract: Surface coating of electrical steel sheets is very important due to minimizing eddy current losses in electrical machines. The quality of coating can differ according to the composition. [..] Read more

Abstract: Electrochemical noise analysis (ENA) was used for the evaluation of corrosion protective properties of patina rust layer formed on weathering steel S355J23W after 8 years of exposure test in Berlin atmosphere. Electrochemical parameters derived from shot noise theory were obtained and related with changes or degradation in tested rust film during 456 h exposure in SO42- and Cl- containing aqueous solution. [..] Read more

Abstract: This paper deals with the influence of various austenitizing temperatures on microstructure and kinetics growth of austenite grain in 9 CrNB steel. High austenitizing temperatures (1070 °C, 1150 °C, 1170 °C, 1190 °C, 1210 °C and 1230 °C) with a holding time 120 min were used. [..] Read more

Abstract: Sharp-edged carbides in high-alloy tool steels reduce their toughness appreciably. Since they form during solidification, they are virtually impossible to remove by conventional routes. [..] Read more