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    Wyświetlanie 1-15 z 15
    Tytuł:
    The Morphology of Impact Fracture Surfaces in Manganese Cast Steel Modified by Rare Earth Elements
    Autorzy:
    Kasińska, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/946876.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cast steel
    modification
    REM
    impact strength
    fracture analysis
    staliwa
    modyfikacja
    siła uderzenia
    pęknięcia
    Opis:
    The morphology of G20Mn5 specimens made of non-modified and rare earth metals (REM) modified cast steel was investigated. Molten metal was treated with a cerium-rich mischmetal contain 49.8% Ce, 21.8% La, 17.1% Nd, 5.5% Pr and 5.35% other rare earth metals making up the balance. The melting, quenching (920°C/water) and tempering (720°C/air) were performed under industrial conditions. Analysis included G20Mn5 cast steel fracture specimens subjected to Charpy V-notch impact testing at 20°C, -30°C and -40°C. The purpose of the analysis was to determine the influence of REM on the microstructure and mechanical properties of G20Mn5 cast steel and the REM effect on the morphology, impact strength and character of the fracture surfaces. In addition, a description of the mechanism by which fracture occurred in the two materials was proposed. The author demonstrated the beneficial effects of adding REM to molten steel, manifested by a 20 - 40% increase in impact toughness, depending on test temperature, as compared to the non-modified cast steel. Important findings included more than 100% increase in impact strength in comparison with the required impact toughness of 27J at -40C for heat treated steels (EN 10213).
    Źródło:
    Archives of Foundry Engineering; 2020, 20, 2; 89-94
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Natural Ageing on Impact Strength of the EN AC-AlSi9Cu3(Fe) Alloy
    Autorzy:
    Pezda, J.
    Jarco, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/382298.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    aluminum alloy
    natural ageing
    impact strength
    stop aluminium
    starzenie naturalne
    odporność na uderzenia
    Opis:
    Growing market demand, more and more efficient and cleaner vehicles create a challenge for automotive industry. Properties of aluminum, such as: high strength stiffness to weight ratio, high fluidity and castability, easy machinability and weldability and good corrosion resistance make them ideal candidate to replacement of a heavier materials used in vehicles, and the same, have direct effect on fuel consumption. Comparing to steel, titanium or carbon fibers, aluminum alloys are characterized by low impact strength, which can be improved by a heat treatment. In this study one investigated the effect of the heat treatment (natural ageing) on the EN AC-AlSi9Cu3(Fe) alloy modified with strontium. Solution heat treatment temperature’s ranges were selected on the base of heating (melting) curves recorded with use of the thermal derivative analysis (ATD) method. Temperatures of the solution heat treatment were 495°C, 510°C, and 525°C ± 5°C, while the solutioning time ranged from 15 to 105 minutes (15; 60 and 105 min.). Time of the ageing amounted to 1, 3 and 7 days. To determine impact strength of the alloy after performed heat treatment one implemented simplified Charpy test. Maximal values of the impact strength (9,6 J/cm2) were obtained for solutioning temperature 510°C and solutioning time 15 minutes, after seven days of ageing. Obtained results enabled determination of solutioning parameters, which allow obtainment of increased impact strength of the investigation alloy for the T4 heat treatment.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 1 spec.; 81-84
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact Strength of Austenitic and Ferritic-Austenitic Cr-Ni Stainless Cast Steel in -40 and +20°C Temperature
    Udarność kwasoospornego staliwa Cr-Ni w temperaturze -40 i +20°C
    Autorzy:
    Kalandyk, B.
    Zapała, R.
    Boroń, Ł.
    Solecka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/353749.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    stainless cast steel
    microstructure
    impact strength
    fractographic examination
    staliwo nierdzewne
    mikrostruktura
    odporność na uderzenia
    udarność
    Opis:
    Studies described in this paper relate to common grades of cast corrosion resistant Cr-Ni steel with different matrix. The test materials were subjected to heat treatment, which consisted in the solution annealing at 1060°C followed by cooling in water. The conducted investigations, besides the microstructural characteristics of selected cast steel grades, included the evaluation of hardness, toughness (at a temperature of -40 and +20°C) and type of fracture obtained after breaking the specimens on a Charpy impact testing machine. Based on the results of the measured volume fraction of ferrite, it has been found that the content of this phase in cast austenitic steel is 1.9%, while in the two-phase ferritic-austenitic grades it ranges from 50 to 58%. It has been demonstrated that within the scope of conducted studies, the cast steel of an austenitic structure is characterised by higher impact strength than the two-phase ferritic-austenitic (F-A) grade. The changing appearance of the fractures of the specimens reflected the impact strength values obtained in the tested materials. Fractures of the cast austenitic Cr-Ni steel obtained in these studies were of a ductile character, while fractures of the cast ferritic-austenitic grade were mostly of a mixed character with the predominance of brittle phase and well visible cleavage planes.
    Zaprezentowane w artykule badania dotyczą popularnych gatunków kwasoodpornego staliwa Cr-Ni o różnej osnowie. Zastosowane do badań materiały poddano obróbce cieplnej (przesycanie w temperaturze 1060°C i chłodzenie w wodzie). Przeprowadzone badania oprócz charakterystyki mikrostruktury wybranych gatunków staliwa obejmowały ocenę twardości, udarności (w temperaturze -40 i +20°C) oraz charakteru przełomów uzyskanych w wyniku złamania próbek na młocie Charpie'go. Na podstawie uzyskanych wyników udziału objętościowego ferrytu stwierdzono, że w staliwie austenitycznym występuje 1.9% tej fazy, natomiast w dwóch staliwach ferrytyczno-austenitycznych (F-A) udział ferrytu mieścił się w przedziale 50÷58%. Wykazano, że staliwo o strukturze austenitycznej charakteryzuje się wyższą udarnością w porównaniu do dwufazowego staliwa ferrytyczno-austenitycznego (F-A). Zmiany jakie zaszły w charakterze przełomów próbek były odzwierciedleniem uzyskanych wyników udarności badanych materiałów. W zakresie przeprowadzonych badań przełomy austenitycznego staliwa Cr-Ni wykazują charakter ciągliwo-kruchy, a przełomy staliwa F-A są przeważnie przełomami o charakterze mieszanym z przewagą przełomu kruchego z widocznymi płaszczyznami łupliwości.
    Źródło:
    Archives of Metallurgy and Materials; 2014, 59, 3; 1103-1106
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on the Energy of Destruction of Bindings of a Core and Moulding Sand Based on Quartz Sand Grains
    Autorzy:
    Dańko, R.
    Dajczer, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/383164.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    moulding sand
    deformation energy
    impact resistance
    tensile strength
    masa formierska
    odkształcenia
    odporność na uderzenia
    wytrzymałość na rozciąganie
    Opis:
    In the knock-out process, as well as in the preliminary phase of moulding sand reclamation, the issue of energy demand for the process of crushing used sand agglutinations, preferably to single grains, is particularly important. At present, numerical values of moulding sand impact resistance, which would allow energy-related aspects of this process to be forecast, are not known, as such research has not been carried out. It seems that impact resistance tested on very small cross-section samples, which allows us to very precisely reveal some unique features of a moulding sand with organic and inorganic binders, is an important parameter, which so far has not been taken into account for evaluation of mechanical properties of moulding sands. Preliminary attempts to determine impact resistance of moulding sands have been carried out as part of own research of the author. The conducted investigations aimed at determining the relationships between the obtained values of tensile strength and impact resistance of moulding sands. In addition, the effect of holding samples at temperatures of 100oC, 200oC, 300oC on the value of impact resistance was determined, both for sands made with fresh and with reclaimed sand grains.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 1; 19-22
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Changes in Impact Strength and Abrasive Wear Resistance of Cast High Manganese Steel Due to the Formation of Primary Titanium Carbides
    Autorzy:
    Tęcza, G.
    Zapała, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/383189.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high-manganese steel
    microstructure
    primary carbides
    microhardness
    impact strength
    abrasion
    stal wysokomanganowa
    mikrostruktura
    węgliki
    mikrotwardość
    siła uderzenia
    Opis:
    Cast high-manganese Hadfield steel is commonly used for machine components operating under dynamic load conditions. Their high fracture toughness and abrasive wear resistance is the result of an austenitic structure, which - while being ductile - at the same time tends to surface harden under the effect of cold work. Absence of dynamic loads (e.g. in the case of sand abrasion) causes rapid and premature wear of parts. In order to improve the abrasive wear resistance of cast high-manganese steel for operation under the conditions free from dynamic loads, primary titanium carbides are produced in this cast steel during melting process to obtain in castings, after melt solidification, the microstructure consisting of an austenitic matrix and primary carbides uniformly distributed therein. After heat treatment, the microhardness of the austenitic matrix of such cast steel is up to 580 μHV20 and the resulting carbides may reach even 4000 μHV20. The impact strength of this cast steel varies from 57 to 129 and it decreases with titanium content. Compared to common cast Hadfield steel, the abrasive wear resistance determined in Miller test is at least twice as high for the 0.4% Ti alloy and continues growing with titanium content.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 1; 119-122
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact strength of squeeze casting AlSi13Cu2–CF composite
    Autorzy:
    Zyska, A.
    Konopka, Z.
    Łągiewka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/946862.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    casting composites
    squeeze method
    carbon fibers
    impact strength
    microstructure
    kompozyty
    metoda wyciskania
    włókna węglowe
    siła uderzenia
    mikrostruktura
    Opis:
    The paper presents the results of research on microstructure and impact strength of AlSi13Cu2 matrix composite reinforced by Ni-coating carbon fibers (CF) with a volume fraction of 5%, 10% and 15%. The composite suspensions were prepared using by stirring method and subsequently squeeze casted under different pressures of 25, 50, 75 and 100 MPa. As part of the study, fiber distribution in aluminum matrix was evaluated and variation in impact strength of composite as a function of the carbon fibers volume fraction and pressure applied were determined. It has been found that the presence of Ni coating on carbon fibers clearly improves their wettability by liquid aluminum alloy and in combination with the stirring parameters applied, composite material with relatively homogeneous structure can be produced. Charpy's test showed that the impact strength of composite reaches the highest value by carrying out the squeeze casting process at 75 MPa. In the next stage of research, it was found that the impact strength of composites increases with the increase of carbon fibers volume fraction and for 15% of fibers is close to 8 J/cm2. Observations of fracture surfaces have revealed that crack growth in the composites propagates with a quasi-cleavage mechanism. During the creation of the fracture, all fibers arranged perpendicular to its surface were sheared. At the same time, the metal matrix around the fibers deformed plastically creating characteristic ductile breaks. The fracture surface formation through the fibers indicates a cohesive and strong connection of the reinforcement with the matrix. In addition to the phenomena mentioned, debonding the fiber-matrix interfaces and the formation of voids between components were observed on the fracture surface.
    Źródło:
    Archives of Foundry Engineering; 2020, 20, 2; 49-52
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental research on influence of gas impact on thermal and mechanical properties of auxetic material covered with titanium silicide coating
    Autorzy:
    Miedzińska, D.
    Gieleta, R.
    Małek, E.
    Zasada, D.
    Stankiewicz, M.
    Marszałek, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/201182.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Ti-Si layers
    damage
    impact
    thermal resistance
    SEM
    auxetic materials
    Ti-Si
    uszkodzenia
    uderzenia
    opór cieplny
    materiały auksetyczne
    Opis:
    The aim of the presented work was to study the auxetic textiles covered with titanium silicide coating. The research was carried out to develop the material structure, which will be used for protective clothing, e.g. for firemen. The new material should be characterized by increased heat resistance coupled with protection against gas pressure impact caused e.g. by gas installation damage. In the paper, an assessment of the change in heat resistance properties of a Ti-Si coated auxetic textile loaded with gas pressure impulse was carried out.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 2; 165-172
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Different Inoculants on Impact Toughness in High Chromium Cast Iron
    Autorzy:
    Siekaniec, D.
    Kopyciński, D.
    Guzik, E.
    Tyrała, E.
    Nowak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/383309.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    mechanical properties
    high chromium cast iron
    inoculation
    impact toughness
    hardness
    właściwości mechaniczne
    żeliwo wysokochromowe
    modyfikacja
    odporność na uderzenia
    twardość
    Opis:
    The present work, presented the study of effect of different inoculants on impact toughness in High Chromium Cast Iron. The molds were pouring in industrial conditions and samples were tested in laboratory in Faculty of Foundry Engineering at AGH. Seven samples were tested - one reference sample, three with different addition of Fe-Ti, and three with different addition of Al. The samples were subjected to impact toughness on Charpy hammer and the hardness test. The presented investigations indicate that for the each inoculant there is an optimal addition at which the sample obtained the highest value of impact toughness. For the Fe-Ti it is 0.66% and for Al is 0.17%. Of all the examined inoculants best results were obtained at a dose of 0.66% Fe-Ti. Titanium is a well-known as a good modifier but very interesting results gives the aluminum. Comparing the results obtained for the Fe-Ti and Al can be seen that in the case of aluminum hardness is more stable. The hardness of all samples is around 40-45 HRC, which is not high for this type of cast iron. Therefore, in future studies it is planned to carry out the heat treatment procedure that may improves hardness.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 2; 85-88
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Rare Earth Metals on Microstructure and Mechanical Properties of G20Mn5 Cast Steel
    Autorzy:
    Kasińska, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/379581.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    G20Mn5
    rare earth metals
    modification
    microstructure
    impact toughness
    metale ziem rzadkich
    modyfikacja
    mikrostruktura
    odporność na uderzenia
    Opis:
    The paper describes influence of rare earth metals (REMs) on G20Mn5 cast steel microstructure and mechanical properties. The cerium mixture of the following composition was used to modify cast steel: 49.8% Ce, 21.8% La, 17.1% Nd, 5,5% Pr and 5.35% of REMs. Cast steel was melted in industrial conditions. Two melts of non-modified and modified cast steel were made. Test ingots were subject to heat treatment by hardening (920°C/water) and tempering (720°C/air). Heat treatment processes were also performed in industrial conditions. After cutting flashes off samples of cast steel were collected with purpose to analyze chemical composition, a tensile test and impact toughness tests were conducted and microstructure was subject to observations. Modification with use of mischmetal did not cause significant changes in cast steel tensile strength and yield strength, while higher values were detected for fractures in the Charpy impact test, as they were twice as high as values for the data included in the PN-EN 10213:2008 standard. Observations performed by means of light and scanning microscopy proved occurrence of significant differences in grain dimensions and morphology of non-metallic inclusions. Adding REMs resulted in grain fragmentation and transformed inclusion shapes to rounded ones. Chemical composition analyses indicated that round inclusions in modified cast steel were generally oxysulphides containing cerium and lanthanum. In the paper the author proved positive influence of modification on G20Mn5 cast steel mechanical properties.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 3; 37-42
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multimetal Stahl 1018 Composite – Structure and Strength Properties
    Autorzy:
    Kalisz, D.
    Arustmian, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1840916.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    composite Stahl 1018
    strength properties
    hardness
    impact strength
    yield point
    kompozyt Stahl 1018
    właściwości wytrzymałościowe
    twardość
    siła uderzenia
    granica plastyczności
    Opis:
    The series of experiments was performed on commercial polymeric composite material MultimetalStahl 1018. Strength tests were performed to determine the yield point of the material. The composite had the highest hardness at a temperature of 20°C. Hardness and microhardness were determined in further experiments. The adhesiveness of the material to metal surfaces and impact strength were also analyzed. The scanning electron microscopy and X-ray microanalysis methods were used for analyzing the microstructure of the material. Chemical composition of selected areas was analyzed, which allowed for a preliminary identification of metallic elements content in the composite. The microstructure of composite is highly non-homogeneous and particular phases are highly elongated and angular. The analyzed phase was enriched with silicon, aluminium, magnesium, iron and vanadium other phases enriched with metallic elements, e.g. molybdenum, titanium, vanadium and also oxygen as well as traces of cadmium and chromium. The results were presented in the form of photos and illustrations. The results confirmed the applicability of the composite as a binder for fixing mechanical and foundry devices.
    Źródło:
    Archives of Foundry Engineering; 2020, 20, 4; 77-82
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamic splitting tensile performance of new and old concrete after high temperature treatment
    Autorzy:
    Cao, Hai
    Powiązania:
    https://bibliotekanauki.pl/articles/2033990.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    beton nowy
    beton stary
    SHPB
    dynamic splitting tensile performance
    prędkość uderzenia
    temperatura
    new concrete
    old concrete
    split Hopkinson pressure bar
    impact velocity
    temperature
    Opis:
    In order to study the dynamic splitting tensile properties of new and old concrete after high temperature treatment, the effects of different impact velocities and temperatures on failure modes, dynamic splitting strength and energy absorption of new and old concrete were analyzed by impact dynamic splitting tensile test use of variable cross-section Φ 74 mm split Hopkinson pressure bar apparatus. The results show that: Impact velocity and temperature not only affect the dynamic splitting strength of new and old concrete bonding specimens, but also affect the failure modes and degree of breakage. The dynamic splitting strength of new and old concrete increases with the increase of impact velocity, but the increase rate decreased with the increase of temperature. The dynamic splitting strength first increases slowly and then decreases dramatically with the increase of temperature. In the dynamic splitting test of new and old concrete, the energy absorption increases with the increase of impact velocity and decreases with the increase of temperature.
    Źródło:
    Archives of Civil Engineering; 2021, 67, 4; 79-89
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect Of Strain Rate On The Mechanical Properties And Microstructure Of The High-Mn Steel After Dynamic Deformation Tests
    Wpływ prędkości odkształcenia na właściwości i strukturę stali wysokomanganowej po testach deformacji dynamicznej
    Autorzy:
    Jabłońska, M. B.
    Śmiglewicz, A.
    Niewielski, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/958229.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high-manganese steel
    dynamic deformation test
    strain rate
    impact strength
    mechanical twinning
    structure
    stal wysokomanganowa
    testy deformacji dynamicznej
    prędkość odkształcenia
    siła uderzenia
    bliźniakowanie mechaniczne
    struktura
    Opis:
    The paper presents results of dynamic tensile investigations of high-manganese Fe – 20 wt.% Mn – 3 wt.% Al – 3 wt.% Si – 0.2 wt.% steel. The research was carried out on a flywheel machine, which enables to perform dynamic tensile tests and impact bending with a linear velocity of the enforcing element in the range of 5÷40 m/s. It was found that the studied steel was characterized by very good mechanical properties. Strength of the tested materials was determined in the static tensile test and dynamic deformation test, while its hardness was measured with the Vickers hardness test method. The surface of fractures that were created in the areas where the sample was torn were analyzed. These fractures indicate the presence of transcrystalline ductile fractures. Fractographic tests were performed with the use of a scanning electron microscope. The structure was analyzed by light optical microscopy. Substructure studies revealed occurrence of mechanical twinning induced by high strain rates. A detailed analysis of the structure was performed with the use of a transmission scanning electron microscope STEM.
    W pracy przedstawiono wyniki wstępnych badań dynamicznego rozciągania wysokomanganowej stali gatunku X20MnAlSi16-3-3. Badania przeprowadzono na młocie rotacyjnym, który posiada możliwość realizacji prób dynamicznego rozciągania i udarowego zginania w zakresie prędkości liniowej elementu wymuszającego od 5÷40 m/s. Badana stal charakteryzuje się bardzo dobrymi właściwościami mechanicznymi. Wyniki badań uzyskano na podstawie statycznej próby rozciągania, próby dynamicznego rozciągania na młocie rotacyjnym oraz pomiaru twardości metodą Vickersa. Przeanalizowano powierzchnie przełomów powstałych w miejscu zerwania podczas prób rozciągania, które wskazują na obecność przełomów transkrystalicznych ciągliwych. Badania strukturalne wykonano z wykorzystaniem techniki mikroskopii świetlnej, skaningowej mikroskopii elektronowej i skaningowej transmisyjnej mikroskopii elektronowej. Przeprowadzone badania substruktury ujawniły obecność mechanizmu bliźniakowania mechanicznego, indukowanego w warunkach dużych prędkości odkształcenia.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 2A; 577-580
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of the Annealing Temperature on the Microstructure and Properties of Ausferritic Nodular Cast Iron
    Autorzy:
    Gumienny, G.
    Klimek, L.
    Kurowska, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/383050.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative casting materials
    innovative casting technologies
    ausferritic cast iron
    nodular cast iron
    impact strength
    annealing
    innowacyjne materiały odlewnicze
    innowacyjne technologie odlewnicze
    żeliwo ausferrytyczne
    żeliwo sferoidalne
    siła uderzenia
    wyżarzanie
    Opis:
    The paper presents the microstructure and selected properties of ausferritic nodular cast iron annealed at the temperature 520 and 550°C. This choice was dictated by the temperatures used in the practice of nitriding. Nodular graphite in cast iron was obtained with use of Inmold process. Cast iron containing molybdenum and copper ensuring obtaining an ausferrite in the cast iron matrix without the use of heat treatment of castings was tested. The effect of annealing temperature on the microstructure and the kind of fracture of the ausferritic nodular cast iron was presented. The effect of an annealing temperature on hardness, impact strength and the microhardness of ausferritic nodular cast iron matrix was shown too. The lamellar structure of phases in the cast iron matrix after annealing has been ascertained. There has been an increase in hardness of an annealed cast iron and microhardness of its matrix. The reduction in the impact strength of the cast iron annealed at 520 and 550°C was approximately 10-30%. Both an increase in the hardness of cast iron as well as an decrease in its impact strength is probably due to the separation of secondary carbides during the heat treatment.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 3; 43-48
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of Small Punch Test Method in Studies of the 14MoV63 Steel Before and After Revitalisation
    Zastosowanie metody small punch w badaniach stali 14MoV63 przed i po rewitalizacji
    Autorzy:
    Kłaput, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/356563.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    steel for operation at elevated temperatures
    unconventional small punch test method
    transition temperature
    temperature of sudden loss of ductility
    stal do pracy w podwyższonych temperaturach
    niekonwencjonalna metoda small punch test
    siła uderzenia
    krzywe przejścia
    utrata plastyczności
    Opis:
    The paper presents the results of studies of the chromium-molybdenum-vanadium steel designed for operation at elevated temperatures. The material was examined after long-term operation and after the revitalising heat treatment. Studies were performed by conventional methods and small punch test. Curves of ductile-brittle transition were plotted from the Charpy V-notch impact tests and were next compared with the curves of sudden loss of ductility obtained in the small punch test. Additionally, for the material before and after revitalisation, the values of temperatures Tpk and Tnuc were calculated using the method of inflection point.
    W pracy przedstawiono wyniki badań stali chromowo-molibdenowo-wanadowej przeznaczonej do pracy przy podwyższonych temperaturach. Materiał badano w stanie po wieloletniej eksploatacji i po obróbce cieplnej rewitalizującej. Badania prowadzono z zastosowaniem metod konwencjonalnych oraz przy pomocy metody small punch. Sporządzono krzywe przejścia plastyczno-kruchego z próby udarności Charpy V i porównano je z krzywymi nagłej utraty ciągliwości z próby small punch. Dla materiału przed i po rewitalizacji określono wartości temperatur Tpk i Tnuc stosując metodę punktu przegięcia.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 1; 47-50
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    3-D computer research and comparative analysis of dynamic aspects of drum brakes and caliper disc brakes
    Autorzy:
    Slavchev, Y.
    Dimitrov, L.
    Dimitrov, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/140037.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    3-D computer multibody simulation (MBS) model
    braking time
    friction forces
    normal forces
    radial run-out
    impact function based contact
    komputerowy model 3D kinematycznej symulacji wieloczłonowej MBS
    czas hamowania
    siły tarcia
    siły normalne
    bicie promieniowe
    kontakt oparty na funkcji uderzenia
    Opis:
    This paper presents the construction of adequate 3-D computer models for simulation research and analysis of dynamic aspects of caliper disc brakes, as well as of drum brakes, actuated by a short stroke electromagnet or a hydraulic thruster, when these brake types are used in the hoisting mechanism of cranes. The adequacy of the 3-D models has been confirmed by comparing their simulation results with results from an experiment and from classic computation a models. The classic computational models, related to the study of main dynamic features of friction brakes, are layouts that are based on a number of assumptions, such as that the braking force instantly reaches its steady-state value, the clearance between the friction lining and the disc/drum is neglected, etc. These assumptions lead to alimitation of research options. The proposed 3-D computer models improve the research layouts by eliminating a number of the classic model assumptions. The improvements are related to the determination of the braking time, braking torque, normal force and other dynamic aspects of the brakes by performing simulations that take into account: the braking force as a function of time, the presence of clearance between the friction lining and the disc/drum, etc.
    Źródło:
    Archive of Mechanical Engineering; 2018, LXV, 2; 253-276
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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