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W artykule analizowano wysokotemperaturowe charakterystyki plastyczności stali austenityczno-ferrytycznej (X60MnAl30-9). Mikrostruktura stali po walcowaniu odznacza się obecnością drobnoziarnistego austenitu, a ziarna ferrytu mają charakter pasmowy (rys. 2). Na symulatorze Gleeble przeprowadzono eksperymenty mające na celu określenie skłonności do pękania stali przy rozciąganiu (rys. 4, 5). Określono...
Purpose: Automotive industry constantly demands high-strength steels which are characterized by the energy absorption possibilities during a collision. Such materials may, in the future, replace the currently used conventional steels. The groups of steels which meet these criteria are the austenitic steels and austenitic-ferritic steels with high manganese content (15-30%) and high aluminium content...
Purpose: Paper presents results of investigations mechanical properties and microstructure samples selected nonferrous metals after ECAP. These properties and microstructure are influenced by technological factors during application ECAP method. Design/methodology/approach: The sample bars were plastically deformed during the ECAP process. The methods of the light microscopy and the hardness test...
Purpose: The main task of this work was to study the effect a the precipitation hardening on the microstructure and mechanical properties of 6061, 6063 and 6082 aluminium alloys. Design/methodology/approach: In this paper differential scanning calorimetry (DSC) and hardness measurements have been utilized to study the effect of a precipitation hardening on the mechanical properties in 6xxx aluminium...
Purpose: The paper presents the influence of heat treatment parameters (austenitization and tempering temperature) on the microstructure and mechanical properties of high - chromium martensitic GX12CrMoVNbN9-1 (GP91) cast steel. Moreover, the influence of stress relief annealing at the temperatures of 730 and 750oC on microstructure and properties has been investigated. Design/methodology/approach:...
Purpose: The paper presents influence of degree processing for parameters of the structure and properties of products after hot rolling of continuous ingots made of low carbon steels. Design/methodology/approach: Ingots with cross sections of 105x105 mm and 135x135mm were rolled to wire rod and bars respectively, with applying the degree of processing λ=6.5-115 and λ=3-14. Tests of the microstructure...
Purpose: Steel cleanliness, microstructure and fracture mode have been studied, with the aim of enhancing mechanical properties and toughness of the high cobalt and cobalt-free maraging steels. Design/methodology/approach: To fully evaluate all relevant metallurgical factors affecting steel mechanical properties and toughness, broad range of the experimental techniques was used: quantitative metallography,...
Purpose: The effects of relevant metallurgical factors on the structure, fracture mode and properties of the high cobalt and cobalt free maraging steel has been studied. The aim was to better understand structure-property relations and enhance mechanical properties of the steels. To provide data needed for production and manufacturing technology, the high temperature deformability using physical simulation...
Purpose: The aim of this work was to investigate the possibility of increasing performance of the PtRh alloys used in industrial processes of catalytic ammonia oxidation. Design/methodology/approach: In order to reach this objective, the extensive studies have been carried out, which were aimed at better understanding of the phenomena taking place on a surface and inside the wires of catalytic gauzes...
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