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    Wyświetlanie 1-13 z 13
    Tytuł:
    The Influence of Deformation and Austenitization Temperature on the Kinetics of Phase Transformations During Cooling of High-Carbon Steel
    Autorzy:
    Kawulok, P.
    Podolinský, P.
    Kajzar, P.
    Schindler, I.
    Kawulok, R.
    Ševčák, V.
    Opěla, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/350975.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high-carbon steel
    cooling
    transformation diagrams
    microstructure
    hardness
    Opis:
    The aim of the performed experiments was to determine the influence of deformation and of austenitization temperature on the kinetics of phase transformations during cooling of high-carbon steel (0.728 wt. % C). The CCT and DCCT diagrams for austenitization temperature 940°C and DCCT diagram for austenitization temperature 1000°C were constructed with the use of dilatometric tests. On the basis of obtained results, a featureless effect of austenitization temperature and deformation on the kinetics of phase transformations during cooling of investigated steel was observed. Critical cooling rates for the transformation of martensite in microstructure fluctuated from 5 to 7°C · s-1 (depending on the parameters of austenitization and deformation), but only at cooling rates higher than 8°C · s-1 a dominant share of martensite was observed in the investigated steel, which resulted in the significant increase of hardness.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 4; 1743-1748
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of the homogenization temperature on the microstructure and properties of AlSi10CuNiMn alloy
    Autorzy:
    Cais, J.
    Kraus, P.
    Lysoňková, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/102937.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    aluminum alloy
    heat treatment
    microstructure
    intermetallic phase
    microhardness
    Opis:
    The article examines the impact of changes in homogenization temperature in the hardening process on the microstructure of aluminum alloys. The research samples were cast from AlSi10CuNiMn alloy produced by gravity casting technology in metal mold. Subsequently, the castings were subjected to a heat treatment. In an experiment with changing temperature and staying time in the process of homogenization. The microstructure of the alloy was investigated by methods of light and electron microscopy. Examination of the microstructure has focused on changing the morphology of separated particles of eutectic silicon and intermetallic phases. The analysis of intermetallic phases was supplemented by an analysis of the chemical composition – EDS analysis. Effect of heat treatment on the properties investigated alloy was further complemented by Vickers microhardness. Investigated alloy is the result of longtime research conducted at the Faculty of Production Technology and Management.
    Źródło:
    Advances in Science and Technology. Research Journal; 2017, 11, 1; 104-110
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Liquid-solid interaction during formation of nanocomposite systems
    Autorzy:
    Shtablavyi, I.
    Mudry, S.
    Kajak, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/779001.pdf
    Data publikacji:
    2012
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    composite materials
    liquid metals and alloys
    metallic powders
    microstructure
    short-range order
    Opis:
    Structural changes in mixtures of liquid Bi with small Cu and Ni particles were studied at temperatur es of 615 and 1145K. Microstructures of the composites were observed (SEM) and analyzed after treatment at different temperatures and various durations of stirring. The structure of the mixtures of Bi with Cu(Ni) particles was investigated by means of X-ray diffraction, both in the solid and liquid state.
    Źródło:
    Polish Journal of Chemical Technology; 2012, 14, 4; 42-45
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure and Texture Evolution in Temper Rolled Fe-Si Steels with New System Nano-Inhibitors under the Dynamic Annealing Conditions
    Autorzy:
    Kováč, F.
    Petryshynets, I.
    Horňak, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/356939.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    grain-oriented Fe-Si steels
    abnormal grain growth
    VC inhibitors
    microstructure
    texture
    Opis:
    This work investigates the microstructure and texture evolution in grain-oriented electrotechnical steel with a new inhibition system based on vanadium carbides nano-particles. The novel approach for the preparation of this steel with appropriate final magnetic properties combines not only nanoinhibitors based on the vanadium carbides precipitations but also includes straininduced grain growth mechanism in combination with dynamic continuous annealing during the secondary recrystallization. The experimental grain-oriented steel with proposed new chemical composition was prepared in laboratory conditions. The texture analysis has shown that suggested procedure led the formation of sufficiently strong {110}<001> Goss texture during the short time period of a final annealing process, which is comparable to that obtained in the conventionally treated grain-oriented steels.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 3; 1727-1732
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fabrication and Investigation of Thermal and Wear Properties of Zinc Novel Coatings Reinforced with Nano-Al2O3 and Cr2O3 Particles
    Autorzy:
    Popoola, A. P. I.
    Malatji, N.
    Fayomi, O. S. I.
    Powiązania:
    https://bibliotekanauki.pl/articles/356056.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    microstructure
    corrosion
    nanocomposite coatings
    thermal stability
    tribology
    Opis:
    The study of the thermal, wear and corrosion properties of developed nanocomposite coatings of Zn-Al2O3 and Zn-Cr2O3 was carried out. The coatings were produced by electrodeposition technique from chloride acidic bath. Laboratory tube furnace was used for the thermal analysis. The wear test was performed using CETR tribo-tester dry reciprocating tester. The hardness properties were investigated using diamond base Dura microhardness tester. Scanning electron microscope (SEM) affixed with energy dispersive spectrometry was used to study the morphological characteristics, before and after wear deformation. The corrosion degradation behavior was observed using linear polarization technique in 3.5% NaCl. In all the interaction, the effects of the incorporated Al2O3 and Cr2O3 nanoparticulates on zinc rich coatings were found to have an excellent influence on the wear, corrosion and thermal stability properties. The fabrication and properties exhibited by the alloys were therefore found to be satisfactory and shows good predictability and applicability.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 3; 1671-1676
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preparation and Evaluation of Properties of Cast Metallic Foams with Regular Inner Structure
    Autorzy:
    Lichý, P.
    Elbel, T.
    Kroupová, I.
    Radkovský, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/353931.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metallic foams
    casting
    microstructure
    mechanical properties
    Opis:
    Lately we encounter still more new applications of metallic foams, as well as possible methods of their manufacture. These metallic materials have specific properties, such as large rigidity at low density, in some cases high thermal conductivity, capability to absorb energy, etc. The work is focused on the preparation of these materials using conventional casting technology, which ensures rapid and economically feasible method for production of shaped components. In the experimental part we studied conditions of casting of metallic foams with a regular structure made of ferrous and non-ferrous alloys. For thus obtained castings we evaluated the achieved microstructure and mechanical properties, which determine the possible use of these materials. The samples were subjected to compression tests, by which we investigated deformation behaviour of selected materials and determined the value of energy absorption.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 3; 1643-1646
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of the Effect of Deformation on Transformation Diagrams of Two Low-Alloy Manganese-Chromium Steels
    Autorzy:
    Kawulok, R.
    Kawulok, P.
    Schindler, I.
    Opěla, P.
    Rusz, S.
    Ševčák, V.
    Solowski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/355693.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    CCT diagrams
    DCCT diagram
    16MnCrS5 steels
    20MnCrS5 steels
    dilatometric tests
    microstructure
    Opis:
    The work deal with an assembling and comparing of transformation diagrams of two low-alloy steels, specifically 16MnCrS5 and 20MnCrS5. In this work, diagrams of the type of CCT and DCCT of both steels were assembled. Transformation diagrams were assembled on the basis of dilatometric tests realized on the plastometer Gleeble 3800, of metallographic analyses and of hardness measurements. In addition, for comparison, the transformation diagrams were assembled even with use of the QTSteel 3.2 software. Uniform austenitization temperature of 850°C was chosen in case of both steels and even both types of diagrams. In case of both steels, an influence of deformation led to expected acceleration of phase transformations controlled by diffusion and also of bainite transformation. In both cases, the kinetics of martensitic transformation was not significantly affected by deformation.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 4; 1735-1741
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Selection of protective coatings obtained by plasma-spraying method for foundry industry
    Dobór powłok ochronnych otrzymanych metodą natrysku plazmowego do zastosowania w przemyśle odlewniczym
    Autorzy:
    Richert, M.
    Nejman, I.
    Zawadzka, P.
    Kacprzyńska-Gołacka, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/264269.pdf
    Data publikacji:
    2017
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    plasma spraying
    foundry industry
    microstructure
    wettability
    natrysk plazmowy
    przemysł odlewniczy
    mikrostruktura
    zwilżalność
    Opis:
    This article presents results from the studies of protective coatings applied to industrial graphite molds used for the casting of non-ferrous metals. The selection of coatings was based on the results of measurements of surface wettability by liquid copper and microstructure examinations. The study involved industrial graphite molds with single-layer protective coatings of Al2O3 + 30%C and ZrO2-Y2O3 + 30%C as well as two-layer protective coatings of Al2O3 + 30%C /glassy carbon and ZrO2-Y2O3 + 30%C /glassy carbon.
    W artykule przedstawiono wyniki badań powłok ochronnych przeznaczonych do ochrony grafitowych krystalizatorów stosowanych w przemyśle odlewniczym. Dobór powłok nastąpił na podstawie wyników badań mikrostruktury i pomiarów zwilżalności powierzchni przez ciekłą miedź. Badaniami objęto grafitowe krystalizatory z naniesionymi powłokami ochronnymi: jednowarstwowymi Al2O3 + 30%C i ZrO2-Y2O3 + 30%C oraz dwuwarstwowymi Al2O3 + 30%C /węgiel szklisty i ZrO2-Y2O3 + 30%C /węgiel szklisty.
    Źródło:
    Metallurgy and Foundry Engineering; 2017, 43, 1; 51-56
    1230-2325
    2300-8377
    Pojawia się w:
    Metallurgy and Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prediction of Chunky Graphite in Nodular Cast Iron on the Base of Numerical Simulation and Experimental Data
    Autorzy:
    Bauer, B.
    Mihalic Pokopec, I.
    Petrič, M.
    Mrvar, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/352270.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    chunky graphite
    nodular cast iron
    numerical simulation
    cooling curve
    microstructure
    Opis:
    Chunky graphite has been recognized for a long time as one of the major problems in production of heavy section nodular cast iron. A great number of studies have been conducted to describe the chunky graphite formation, but a clear understanding of its appearance and a safe mastering of the melt preparation to avoid chunky graphite are not yet available. In the present work the cooling curves were recorded in large cone blocks and standard TA cup. According to measured data from the cone block, melt characteristics and heat transfer coefficient between casting and mould were adjusted in the ProCAST® simulation software. For a near-eutectic nodular cast iron test melt with 0.7 wt.% Ni, relationship between the area of the cone block affected by chunky graphite and simulation software results has been observed, i.e., thermal modulus and time to solidus.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 1; 343-347
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Operating properties of composite antifriction materials on the base of aluminium alloys wastes for printing equipment
    Autorzy:
    Roik, T.
    Gavrish, A.
    Kyrychok, P.
    Vitsuk, Y.
    Dorfman, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/115586.pdf
    Data publikacji:
    2013
    Wydawca:
    Fundacja na Rzecz Młodych Naukowców
    Tematy:
    powder metal grinding wastes
    aluminium alloy AK12MMgN
    making technology
    microstructure
    tribological characteristics
    physical-mechanical properties
    friction parts for polygraphic knife-machines
    Opis:
    The questions of using materials for friction units, first of all, the antifriction materials in particular on the aluminium alloy-based metal matrix take a central place in general problem of increasing the polygraph knife-machines quality. Endurance of such equipment determines a level of printing output quality. This paper summarizes the recent developments of aluminium alloy AK12MMgN industrial grinding wastes-based usage for new antifriction materials and knowledge about their manufacturing technology; specific examples will be given. Research results of new composite material physical, mechanical and tribological properties in comparison with cast alloy have been presented. The principle possibility to use the valuable industrial grinding wastes of ferrous and color metals for manufacturing of an effective parts of polygraph machines was shown.
    Źródło:
    Challenges of Modern Technology; 2013, 4, 3; 23-27
    2082-2863
    2353-4419
    Pojawia się w:
    Challenges of Modern Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characteristics of plasticity and microstructure of hot forming magnesium alloys Mg-Al-Zn type
    Charakterystyki plastycznosci i mikrostruktura odkształcanych na gorąco stopów magnezu typu Mg-Al-Zn
    Autorzy:
    Kuc, D.
    Hadasik, E.
    Schindler, I.
    Kawulok., P.
    Śliwa, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/350870.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    stop magnezu
    badania plastyczności
    mikrostruktura
    energia aktywacji
    magnesium alloy
    research of plasticity
    microstructure
    dynamic recrystallization
    activation energy
    Opis:
    The paper presents analysis of plasticity characteristics and microstructure of magnesium alloys for hot plastic treatment with different aluminium content (3÷8%). Tests were conducted for assessment of susceptibility of tested alloys to hot plastic deformation. A tensile test was run in temperature from 250 to 450°C. Based on the results, ultimate tensile strength (UTS) and reduction of area (Z) were determined for samples. Conducted compression tests allowed to specify the flow stress and microstructure changes after deformation. The activation energy in hot forming was determined for investigated alloys. The parameters of the process where flow is significantly influenced by twin formation in microstructure were determined. A varied plasticity of tested alloys was found depending on aluminium content. Test results will be useful in development of forging technology of selected construction elements which serve as light substitutes for currently used materials.
    W pracy analizowano charakterystyki plastyczności i mikrostrukturę stopów magnezu przeznaczonych do przeróbki plastycznej na gorąco ze zróżnicowana zawartością aluminium (3-8%). Badania prowadzono dla oceny podatności badanych stopów do kształtowania plastycznego w warunkach przeróbki plastycznej na gorąco. Przeprowadzono próbę rozciągania w temperaturze od 250 do 450 st.C, na podstawie której określono wytrzymałość na rozciąganie i przewężenie badanych próbek. Wykonane próby ściskania pozwoliły na wyznaczenie naprężenia uplastyczniajacego i zmian mikrostruktury po odkształceniu. Dla badanych stopów wyznaczono energię aktywacji odkształcenia plastycznego na gorąco. Określono parametry procesu, dla których na przebieg plastycznego płynięcia wpływa istotnie bliźniakowanie w mikrostrukturze. Wykazano zróżnicowaną plastyczność badanych stopów w zależności od zawartości aluminium. Wyniki badań będą pomocne do opracowania technologii kucia wybranych elementów konstrukcyjnych stanowiących lekkie zamienniki stosowanych obecnie materiałów.
    Źródło:
    Archives of Metallurgy and Materials; 2013, 58, 1; 151-156
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effects of Laser Surface Hardening on Microstructural Characteristics and Wear Resistance of AISI H11 Hot Work Tool Steel
    Autorzy:
    Šebek, M.
    Falat, L.
    Kováč, F.
    Petryshynets, I.
    Horňak, P.
    Girman, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/352543.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    hot work tool steel
    laser hardening
    microstructure
    hardness
    wear resistance
    Opis:
    The present study deals with the effects of laser surface treatment on microstructure evolution and wear resistance of AISI H11 hot work tool steel in quenched and tempered condition. The most upper laser-affected zone is characterized by re-melted microstructure consisting of dendrite cells with fresh non-tempered martensite, retained austenite and inter-dendritic carbidic network. The subsolidus microstructure just beneath the re-melted zone represents the most laser surface hardened zone consisting of fresh non-tempered martensite with fine and coarse carbides as a result of overheating the original QT substrate microstructure. The highest microhardness values in the range from 775 to 857 HV were measured for the LSH microstructure and the most softened microstructure exhibited the minimum hardness of 530 HV. The laser treated samples showed the improvement of their surface wear resistance by 35%.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 3; 1721-1726
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of yttria content and sintering temperature on the microstructure and tendency to brittle fracture of yttria-stabilized zirconia
    Autorzy:
    Kulyk, V.V.
    Duriagina, Z.A.
    Vasyliv, B.D.
    Vavrukh, V.I.
    Lyutyy, P.Ya.
    Kovbasiuk, T.M.
    Holovchuk, M.Ya.
    Powiązania:
    https://bibliotekanauki.pl/articles/2175775.pdf
    Data publikacji:
    2021
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    YSZ ceramics
    microhardness
    fracture toughness
    microstructure
    fracture micromechanism
    ceramika YSZ
    mikrotwardość
    odporność na pękanie
    mikrostruktura
    mikromechanizm pękania
    Opis:
    Purpose: The purpose of this work is to evaluate the propensity to brittle fracture of YSZ ceramics stabilized by the various amount of yttria, based on a study of changes in the microstructure, phase composition, and fracture micromechanisms. Design/methodology/approach: The series of 3YSZ, 4YSZ, and 5YSZ ceramic specimens were sintered in an argon atmosphere. Three sintering temperatures were used for each series: 1450°C, 1500°C, and 1550°C. Microhardness measurements were performed on a NOVOTEST TC-MKB1 microhardness tester. The configuration of the imprints and cracks formed was studied on an optical microscope Neophot-21. The fracture toughness of the material was estimated using both the Vickers indentation method and a single-edge notch beam (SENB) test performed under three-point bending at 20°C in air. The microstructure and morphology of the fracture surface of the specimens were studied using a scanning electron microscope Carl Zeiss EVO-40XVP. The chemical composition was determined using an INCA ENERGY 350 spectrometer. Findings: Peculiarities of changes in the microstructure, the morphology of specimens fracture surface, and mechanical characteristics of YSZ ceramic materials of different chemical and phase compositions sintered in a temperature range of 1450°C to 1550°C are found. Research limitations/implications: To study the actual behaviour of YSZ ceramic materials under operating conditions, it is necessary to evaluate their Young’s moduli, strength, microhardness, and fracture toughness in an operating environment of the corresponding parameters (temperature, pressure, etc.).Practical implications: Based on the developed approach to estimating the propensity to brittle fracture of the formed YSZ ceramic microstructure, it is possible to obtain YSZ ceramic material that will provide the necessary physical and mechanical properties of a wide variety of precision ceramic products. Originality/value: An approach to estimating the propensity to brittle fracture of YSZ ceramics stabilized by the various amount of yttria is proposed based on two methods of evaluating crack growth resistance of materials, namely, the Vickers indentation method and SENB method.
    Źródło:
    Archives of Materials Science and Engineering; 2021, 109, 2; 65--79
    1897-2764
    Pojawia się w:
    Archives of Materials Science and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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