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Purpose: The aim of this paper was to determine the strength and elasticity of low melting point alloys. In particular, the laboratory tests were observed to check the shape of the compression curve. This is a result of recrystallization. Design/methodology/approach: The strength and stiffness of the low melting point alloys was found. The unusual shape of the compression curve was observed. In order...
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: The main task of this work was to study the solidification process through analysis of the DSC curves that were obtained at solidification rate of 5 K/min. During C355.0 alloy solidification an amount of different intermetallic phases may form. Their volume fraction, chemical composition and morphology exert significant influence on a technological and mechanical properties of the aluminium...
Purpose: Paper presents results of investigations with two layers explosively formed sandwich composite consisting of different composition joint which requires very often knowledge of structure and mechanical properties. These properties are connected with microstructure that is influenced by technological factors under cladding. Design/methodology/approach: The sample bars were prepared from explosively...
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 aluminum/steel structural transition joints (STJs) are widely used in shipbuilding industry due to the advantages of joining these two materials with important weight savings while exploiting their best properties. The research objective is the evaluation of mechanical strength of explosion welded structural transition joints by imposing severe thermal loads in specific temperature ranges...
Purpose: In this paper the mechanical properties and structure of cold rolled austenitic stainless steel X5CrNi18-8 with a draft of 17%-78% were presented. Design/methodology/approach: The main methods used for these researches were the static tensile test, microhardness and metallographic observations by optical microscopy. The tested samples have also been analyzed fractographically. The amount...
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: The aim of this research was presentation of the Continuous Cooling Transformations (CCT) diagrams and mechanical properties of two new bainite rail steels with working names RB370 and RB390. Design/methodology/approach: The CCT duiagrams was prepared by dilatometric method. The mechanical properities (Rp0,2, Rm, A, Z, KV, KU2, KIc and KIc-20) was searched according to European Standards...
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: Influence of austenitiziation parameters (temperature and time) on grain size and mechanical properties of low alloy cast steel have been investigated. Design/methodology/approach: The grain size of former austenite was determined by Image Pro Plus software and its distribution by STATISTICA software. The fractography was characterized using TEM. Moreover, mechanical properties (impact energy...
Purpose: The aim of the paper is to determine the influence of the isothermal holding conditions in a range of bainitic transformation on the mechanical stability of retained austenite for medium-carbon TRIP-aided steel. Design/methodology/approach: The examinations were carried out on medium-carbon steel containing 0.55%C and 1.35%Si. The conditions of heat treatment consisted of isothermal quenching...
Purpose: The paper presents the results of investigations concerning the impact strength of thick steel plates at lowered temperature obtained by industrial smelting of micro-alloyed steel of the type S1100QL (Weldox 1100) and S1300QL (Weldox 1300) with a yield strength of 1100-1300 MPa. Design/methodology/approach: The main methods used for these researches were the impact test Charpy V at lower...
Purpose: The paper analyzes the influence of the degree of cold deformation on the structure forming and changes of mechanical and magnetic properties of cold-rolled sheet on austenitic X5CrNi18-8 stainless steel. Design/methodology/approach: The investigations included observations of the structure on a light microscope, researches of mechanical properties in a static tensile test, microhardness...
Purpose: The aim of the work is presents the influence of casting method and anodic treatment parameters on properties, thickness and structure of an anodic layer formed on aluminium casting alloys. Design/methodology/approach: Investigations were carried out on the laser profile measurement gauge MicroProf from company FRT, abrasive wear test was made with using ABR-8251 equipment delivered by TCD...
Purpose: The paper analyzes the influence of the degree of cold deformation on the structure and mechanical properties of austenitic stainless steel X5CrNi18-10. Design/methodology/approach: The investigations included observations of the structure on a light microscope, researches of mechanical properties in a static tensile test and microhardness measurements. The analysis of the phase composition...
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