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    Tytuł:
    Effect of Boron and Tungsten Carbides on the Properties of TiC-Reinforced Tool Steel Matrix Composite Produced by Powder Metallurgy
    Autorzy:
    Slokar Benić, Ljerka
    Šubić, Jadranko
    Erman, Žiga
    Powiązania:
    https://bibliotekanauki.pl/articles/355244.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metal matrix composite
    steel/TiC composite
    powder metallurgy
    properties
    microstructure
    Opis:
    The influence of boron carbide and tungsten carbide on the apparent porosity, density, coercive force, hardness and micro-structure of metal matrix composite of the Ferro-TiC type, is presented in this paper. The samples of investigated steel/titanium carbide composite were produced by powder metallurgy process, i.e. by powders mixing and compacting followed by sintering in the vacuum furnace. According to the results, steel/titanium carbide composite materials with addition up to 11.9 vol.% of boron carbide are interesting to detailed investigation as well as materials having more than 17.2 vol.% of tungsten carbide because these compositions show significant changes in hardness and coercive force values.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 2; 539-547
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of TiC Reinforcement on Wear Resistance of Magnesium Matrix Composite by FSP
    Autorzy:
    Singh, Balraj
    Singh, Jagdev
    Singh, Ravinder Joshi
    Powiązania:
    https://bibliotekanauki.pl/articles/2048864.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    friction stir processing
    FSP
    wear behavior
    surface composites
    Mg composites
    TiC composite
    Opis:
    In the current study, wear performance of pure magnesium (Mg) and composite fabricated with titanium carbide (TiC) reinforcement is investigated under various loading and sliding velocity conditions. The Mg-matrix composite is prepared by friction stir processing (FSP) carried out at optimized values of process parameters. Sliding wear tests on Mg and friction stir processed (FSPed) Mg+TiC surface composite were done on pin-on-disc configuration. The consequence of the normal load applied and sliding velocity on wear behaviour of the two materials is evaluated by performing the tests at two normal loads of 6 N and 12 N and three sliding speeds of 0.5 m/s, 1.5 m/s and 4.5 m/s. FSPed composite found to exhibit an enhanced wear resistance as compared to that of pure Mg. To get an insight into the possible types of mechanisms for wear of the composites sample under varying load and sliding speeds conditions, the worn test specimens are subjected to scanning electron microscopy (SEM). SEM/EDS analysis revealed that oxidation, ploughing, trailing edge and 3-body abrasive wear were the predominant mechanisms for the wear of samples at a different set of experimental conditions. The tensile strength of the FSPed surface composite was found to be 25% higher than pure Mg. Wear resistance was found to increase by about 33%.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 1; 293-302
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment on Gamma Attenuation Behavior of W-VC-C and W-VC-TiC-C Composites for Co-60 Radioisotope
    Autorzy:
    Demir, E.
    Tugrul, A.
    Sonmez, S.
    Ovecoglu, L.
    Buyuk, B.
    Yilmaz, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1031587.pdf
    Data publikacji:
    2017-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    attenuation coefficient
    Co-60
    radiation shielding material
    transmission technique
    W-VC-C-TiC composite
    Opis:
    In this study, tungsten-vanadium carbide-graphite (W-VC-C) and tungsten-vanadium carbide-titanium carbide-graphite composite (W-VC-TiC-C) materials were investigated against Co-60 gamma radioisotope. The composite materials which are used in advanced technological studies and high temperature applications in many various fields especially in the areas of fission and fusion armor materials were produced by mechanical alloying method as in two groups. One of them include 93% tungsten (W), 6% vanadium carbide (VC) and 1% graphite (C) also which has three different alloying times (6-12-24 h). Other group of the samples was composed of 91% tungsten, 6% vanadium carbide (VC), 2% titanium carbide (TiC) and 1% graphite (C) also which has three different alloying times (6-12-24 h) and sintered at 1750°C. Co-60 gamma radioisotope source and gamma transmission technique were used in the experiments to investigate the properties of the composite materials. The mass attenuation coefficients of the samples were determined by using experimental results and theoretical mass attenuation coefficients were calculated from XCOM computer code. It can be concluded that increasing the tungsten ratio causes higher mass attenuation coefficient and the composite materials have provided us benefits better than lead for radiation gamma shielding.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 3; 830-832
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Composite zones produced in situ in the Ni3Al phase
    Autorzy:
    Olejnik, E.
    Janas, A.
    Sikora, G.
    Tokarski, T.
    Nowak, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/379777.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    composite layer
    Ni3Al
    cast intermetallic
    in situ
    synthesis TiC carbides
    warstwa kompozytowa
    węglik TiC
    Opis:
    The study presents the results of research on the development of composite zones in castings based on the intermetallic phase of Ni3Al. Composite zones were obtained by placing packets with substrates for the reaction of titanium carbide in a foundry mould. To provide a variable carbides content in the composite zone, two compositions of the packets were prepared. The first packet contained only substrates for the reaction of TiC synthesis; the second one also contained a filler. The resulting composite zones in castings were examined for the filler effect on changes in the volume fraction, size and morphology of carbides in the zone. In addition, the effect of filler on the mechanical properties of the zone was verified, observing changes of Vickers hardness in this area. It was found that the presence of filler in the composition of the packet for synthesis reduced the content of carbides, as well as their size and morphology. Lower surface content of carbides reduced hardness of the zone, which enabled smooth control of the mechanical properties. At the same time, the use of the selected filler did not disturb the course of the TiC carbide synthesis.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 1; 107-112
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of the Mechanical and Electrical Properties of Spark Plasma Sintered Titanium Carbide Reinforced Alumina Ceramic Composite
    Autorzy:
    Selvakumar, G.
    Prakash, S. Ram
    Rajkumar, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2049356.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Spark Plasma Sintering
    alumina composite
    TiC
    mechanical properties
    fracture toughness
    Opis:
    Spark Plasma Sintering (SPS) is identified as a suitable technique to prepare the alumina titanium carbide composite to overcome the difficulty in fabricating it through other consolidation method. The present work focuses on the fabrication and characterization of a series of titanium carbide reinforced alumina ceramic composites using a spark plasma sintering process. The titanium carbide reinforcement on the alumina matrix is varied between 20 and 35 wt.%, in order to improve the electrical conductivity and fracture toughness of the composites. The particle size of the starting powders at received and ball milled conditions was analysed through Particle size analyser and Scanning Electron Microscope (SEM). Microstructural analysis revealed that the TiC reinforcement is uniformly dispersed in the sintered composite. XRD report showed that α-alumina and titanium carbide were the two dominant phases without the formation of any reaction phases. Further, the correlation between mechanical and physical properties of the prepared composite was investigated as a function of TiC. Various fracture toughening indicators like crack deflection, bridging and branching were analysed by Vicker’s indentation method. Electrical resistivity of the sintered compact decreases proportionally with the increase in titanium carbide constituents. Maximum density (98.80%) and hardness (20.56 GPa) was obtained for 30 wt. % reinforced composite. Almost 40% improvement in fracture toughness is noted for 25 wt. % reinforced composite. This work demonstrates the synthesis and fabrication of alumina titanium carbide composites at low temperature via SPS resulted in obtaining an intact compact with improved mechanical and electrical properties.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 3; 831-838
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure, Hardness and Wear Resistance of Local TiC-ZrO2/FeCr Reinforcement Fabricated in Situ in Steel Castings
    Autorzy:
    Sobula, S.
    Olejnik, E.
    Kurtyka, P.
    Szymański, Ł.
    Tokarski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/355914.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wear resistance
    composite casting
    TiC reinforced cast steel
    metal matrix composites
    Opis:
    Wear resistance of TiC-ZrO2-Fe locally reinforced steel casting has been investigated. Composites were obtained by introducing to mould cavity compact with TiC reaction substrates, ZrO2 particles and addition of moderator. Casting with local reinforcement – composite zone was obtained. Structure and microstructure of composite zone were investigated with use of X-ray diffraction (XRD) and scanning electron microscope (SEM) methods. The Miller slurry machine and Ball-on-Disc tester were used to determine wear resistance of the fabricated locally reinforced TiC-ZrO2-Fe composites. The worn surface of specimens after test, was studied by SEM. Due to the presence of TiC and ZrO2 particles in composite zone steel castings exhibited higher abrasion resistance than chromium white cast iron with Ni addition Ni-Hard 1 type and comparable with composites with high TiC content.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 1; 119-124
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Composite zones obtained by in situ synthesis in steel castings
    Strefy kompozytowe otrzymywane in situ w odlewach staliwnych
    Autorzy:
    Olejnik, E.
    Sobula, S.
    Tokarski, T.
    Sikora, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/351320.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    composite zone
    in situ
    TiC
    MMC
    cast steel
    microstructure
    strefa kompozytowa
    odlew staliwny
    mikrostruktura
    Opis:
    Application of in-situ technique allows for fabrication of composite zone in the casting with a matrix of cast steel with low carbon content. The reinforcing phase in the composite zone is titanium carbide, produced by the synthesis of substrates introduced into the mould in the form of pressed compacts. Metallographic studies were performed in order to determine of homogeneity of composite zones and characteristic features existed in transition area between the composite zone and core of the casting. The transition areas of composites zone were blurred and there were no discontinuities caused by poor bonding between the composite zone and the core of the casting. To confirm the correct run of the TiC synthesis, phase analysis was performed of the base alloy as well as composite zone. The results of this examination indicated that there were two phases in composite zone, i.e. α Fe and TiC and only α Fe was observed in base alloy. Changes of mechanical properties in the composite zone were examined, measuring its hardness HV. The average hardness values of the base alloy and composite zone were 175±4 and 696±201 HV, respectively.
    W odlewie z ferrytycznego staliwa o niskiej zawartosci węgla, otrzymano strefy kompozytowe. Fazą wzmacniającą strefy kompozytowej był węglik tytanu TiC, uzyskany w wyniku syntezy in situ substratów, wprowadzonych do formy w postaci wyprasek. Przeprowadzono badania metalograficzne stref kompozytowych w celu określenia jednorodności otrzymanej strefy kompozytowej oraz charakteru obszaru przejściowego: strefa kompozytowa - rdzeń odlewu. Obszar przejściowy, pomiędzy strefa kompozytowa, a rdzeniem odlewu, charakteryzował się gradientowym rozkładem TiC oraz brakiem nieciągłości. W celu potwierdzenia prawidłowego przebiegu procesu syntezy TiC, przeprowadzono analizę fazową stopu bazowego oraz otrzymanej strefy kompozytowej. Potwierdzono, że w obrębie strefy kompozytowej występują dwie fazy tj. α Fe i TiC, a stop bazowy zawiera wyłącznie α Fe. Analizowano zmiany mechaniczne w obrębie otrzymanej strefy kompozytowej, badając jej twardość HV. Średnia wartość twardości stopu bazowego oraz strefy kompozytowej wynosiła odpowiednio 175±4 i 696±201 HV.
    Źródło:
    Archives of Metallurgy and Materials; 2013, 58, 3; 769-773
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure Characteristic of TiC-Reinforced Cast Steel after GTAW Remelting
    Autorzy:
    Sobula, S.
    Kwiecień, A.
    Olejnik, E.
    Pałka, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/380286.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    composite steel casting
    TiC
    reinforced cast steel
    GTAW surface remelting
    odlew staliwny
    odlew kompozytowy
    metoda GTAW
    utwardzanie powierzchniowe
    Opis:
    In this study, low-carbon cast steel was reinforced with TiC by SHS-B method, also known as combustion synthesis during casting method. The composite zone was then subjected to surface remelting by Gas Tungsten Arc Welding (GTAW) method. The remelting operation was realized manually, at 150 A current magnitude. Microstructure, phase composition and hardness of remelted zone were investigated. XRD results reveal that the phases of the composite zone in initial state consist of TiC and Feα. Surface remelting resulted in formation of thick layers containing TiC carbides, Feα and Feγ. Microstructural examination has shown strong refinement of titanium carbides in remelted zone and complete dissolution of primary titanium carbides synthetized during casting. The average diameter of carbides was below 2 μm. The structural changes are induced by fast cooling which affects crystallization rate. The hardness (HV30) of the remelted layer was in the range between 250 HV and 425 HV, and was lower than hardness in initial state.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 4; 151-154
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The composition of reaction substrates for TiC carbides synthesis and its influence on the thickness of iron casting composite layer
    Autorzy:
    Olejnik, E.
    Janas, A.
    Kolbus, A.
    Sikora, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/380875.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    composite layer
    composite in situ
    SHS process
    solidification process
    superficial layer
    cast iron
    TiC carbides
    warstwa kompozytowa
    kompozyt in situ
    synteza wysokotemperaturowa
    proces krzepnięcia
    warstwa powierzchniowa
    żeliwo
    Opis:
    The effect of reaction substrates for the TiC carbide synthesis on the composite layer thickness produced in cast iron was examined. It was found that, at a constant weight of the charge amounting to 0.5 kg, changing the weight of the, placed in mould, stoichiometric mixture of titanium carbide (from 0.01 to 0.04 kg) changed the thickness of the composite layer from 1 to 15 mm. Carbides synthesis starts directly in mould induced by the temperature of molten alloy poured into this mould (1700 K). The TiC carbides formed in this reaction are later, i.e. during alloy solidification, acting as a base composite material. The size of TiC carbides obtained in the synthesis is from 1 to 10 μm. They occur in the layers as locally compact and coagulated forms. Microstructure, chemical composition and structure of the obtained materials were tested by scanning electron microscopy (SEM), X-ray microanalysis (EDS), and X-ray diffraction (XRD).
    Źródło:
    Archives of Foundry Engineering; 2011, 11, 2 spec.; 165-168
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wear Resistance of TiC Reinforced Cast Steel Matrix Composite
    Autorzy:
    Sobula, S.
    Olejnik, E.
    Tokarski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/381832.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    kompozyty z osłoną metalową
    MMC
    kompozyt
    staliwo zbrojone TiC
    odporność na zużycie
    metal matrix composites
    MMCs
    composite casting
    reinforced cast steel
    wear resistance
    Opis:
    Wear resistance of TiC-cast steel metal matrix composite has been investigated. Composites were obtained with SHSB method known as SHS synthesis during casting. It has been shown the differences in wear between composite and base cast steel. The Miller slurry machine test were used to determine wear loss of the specimens. The slurry was composed of SiC and water. The worn surface of specimens after test, were studied by SEM. Experimental observation has shown that surface of composite zone is not homogenous and consist the matrix lakes. Microscopic observations revealed the long grooves with SiC particles indented in the base alloy area, and spalling pits in the composite area. Due to the presence of TiC carbides on composite layer, specimens with TiC reinforced cast steel exhibited higher abrasion resistance. The wear of TiC reinforced cast steel mechanism was initially by wearing of soft matrix and in second stage by polishing and spalling of TiC. Summary weight loss after 16hr test was 0,14÷0,23 g for composite specimens and 0,90 g for base steel.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 1; 143-146
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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