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    Wyświetlanie 1-7 z 7
    Tytuł:
    Impact of surface and volume modification of nickel superalloys IN-713C and MAR-247 on high temperature creep resistance
    Autorzy:
    Cieśla, M.
    Binczyk, F.
    Mańka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/380339.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    nadstop niklu
    makrostruktura
    właściwości mechaniczne
    pełzanie
    nickel superalloy
    macrostructure
    modification
    mechanical properties
    creep
    Opis:
    Impact of surface and volume modification and double filtration during pouring the moulds on basic mechanical properties and creep resistance of nickel superalloys IN-713C and MAR-247 in conditions of accelerated creep of castings made of post-production scrap of these alloys is evaluated in this paper. The conditions of initiation and propagation of cracks in the specimens were analysed with consideration of stereological properties of material macro- and microstructure. It has been proven that in the conditions of high-temperature creep at 980 C and at stress [...] = 150 MPa, creep resistance of superalloy MAR-247 is more than 10 times higher than the creep resistance of IN-713C alloy. In case of IN-713C alloy, the creep resistance negligibly depends on macrograin sizes. But, the macrograin size considerably affects the time to failure of specimens made of alloy MAR-247. Creep resistance of specimens made of coarse grain material was 20% higher than the resistance of fine grain materials.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 4; 17-24
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanical properties and creep resistance of nickel alloys after complex modification and double filtration
    Autorzy:
    Binczyk, F.
    Gradoń, P.
    Mańka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/382498.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    nadstop niklu
    makrostruktura
    modyfikacja
    filtracja
    twardość
    odporność na pełzanie
    nickel superalloy
    macrostructure
    modification
    filtration
    hardness
    creep behaviour
    Opis:
    The paper presents the results of studies to determine the effect of complex surface and bulk modification and double filtration during mould pouring on the stereological parameters of macrostructure and mechanical properties of castings made from the post-production waste IN-713C and the MAR-247 nickel alloys. The evaluation covered the number of grains per 1mm2 of the sample surface area, the average area of grains and the shape index, hardness HB, tensile strength and resistance to high temperature creep. The results indicate the possibility of controlling the stereological parameters of macrostructure through application of several variants of the modification, controlling in this way also different low- and high-temperature properties. The positive effect of double filtration of the alloy during mould pouring on the metallurgical quality and mechanical properties of castings has also been emphasized.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 2; 5-8
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Durability of MAR-247 and IN-713C Nickel Superalloys under Cyclic Creep Conditions
    Autorzy:
    Cieśla, M.
    Binczyk, F.
    Junak, G.
    Mańka, M.
    Gradoń, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/380030.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    nickel superalloy
    macrostructure modification
    heat treatment
    low-cycle fatigue
    cyclic creep
    nadstop niklu
    modyfikacja makrostruktury
    obróbka cieplna
    zmęczenie niskocyklowe
    pełzanie cykliczne
    Opis:
    Paper presents the assessment of impact of heat treatment on durability in low-cycle fatigue conditions (under constant load) in castings made using post-production scrap of MAR-247 and IN-713C superalloys. Castings were obtained using modification and filtration methods. Additionally, casting made of MAR-247 were subjected to heat treatment consisting of solution treatment and subsequent aging. During low-cycle fatigue test the cyclic creep process were observed. It was demonstrated that the fine-grained samples have significantly higher durability in test conditions and , at the same time, lower values of plastic deformation to rupture Δ□pl. It has been also proven that durability of fine-grained MAR-247 samples can be further raised by about 60% using aforementioned heat treatment.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 4; 17-20
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of metallurgical quality of master heat IN-713C nickel alloy ingots
    Autorzy:
    Binczyk, F.
    Cwajna, J.
    Roskosz, S.
    Gradoń, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/380351.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    analiza termiczna (ATD)
    nadstop niklu
    krzepnięcie odlewu
    wtrącenia niemetaliczne
    ATD thermal analysis
    nickel superalloy
    master heat ingot
    solidification
    non-metallic inclusions
    Opis:
    The paper presents the results of evaluation of the metallurgical quality of master heat ingots and of the identification of non-metallic inclusions (oxides of Al., Zr, Hf, Cr, etc.), which have been found in the shrinkage cavities formed in these ingots. The inclusions penetrate into the liquid alloy, and on pouring of mould are transferred to the casting, especially when the filtering system is not sufficiently effective. The specific nature of the melting process of nickel and cobalt alloys, carried out in vacuum induction furnaces, excludes the possibility of alloy refining and slag removal from the melt surface. Therefore, to improve the quality of castings (parts of aircraft engines), it is so important to evaluate the quality of ingots before charging them into the crucible of an induction furnace. It has been proved that one of the methods for rapid quality evaluation is an ATD analysis of the sample solidification process, where samples are taken from different areas of the master heat ingot. The evaluation is based on a set of parameters plotted on the graph of the dT/dt derivative curve during the last stage of the solidification process in a range from TEut to Tsol.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 4; 5-10
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ceramic filters for bulk inoculation of nickel alloy castings
    Autorzy:
    Binczyk, F.
    Śleziona, J.
    Gradoń, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/379709.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    nickel superalloy
    ceramic filter
    CoAl2O4 inoculant
    compression strength
    nadstop niklu
    filtr ceramiczny
    inokulant CoAl2O4
    wytrzymałość na ściskanie
    Opis:
    The work includes the results of research on production technology of ceramic filters which, besides the traditional filtering function, play also the role of an inoculant modifying the macrostructure of cast nickel alloys. To play this additional role, filters should demonstrate sufficient compression strength and ensure proper flow rate of liquid alloy. The role of an inoculant is played by cobalt aluminate introduced to the composition of external coating in an amount from 5 to 10 wt.%. The required compression strength (over 1MPa) is provided by the supporting layers, deposited on the preform, which is a polyurethane foam. Based on a two-level fractional experiment 24-1, the significance of an impact of various technological parameters (independent variables) on selected functional parameters of the ready filters was determined. Important effect of the number of the supporting layers and sintering temperature of filters after evaporation of polyurethane foam was stated.
    Źródło:
    Archives of Foundry Engineering; 2011, 11, 3 spec.; 29-32
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of solidification parameters and macrostructure of IN-713C castings after complex modification
    Autorzy:
    Binczyk, F.
    Gradoń, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/379884.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    nickel alloy
    superalloy
    modification
    inoculation
    solidification
    thermal analysis
    macrostructure
    stop niklu
    nadstop
    modyfikacja
    inokulacja
    krzepnięcie
    analiza termiczna
    makrostruktura
    Opis:
    The paper presents a research results concerning impact of volume modification (ceramic filter containning cobalt aluminate and hafnium powder) and simultaneous surface and volume modification on solidification and stereological parameters of macrostructure of castings made from post-production scrap of nickel superalloy IN-713C. Research included investigation of the influence of chemical composition on the temperature Tliq i Tsol and evaluation of following macrostructure parameters: the number of grains per mm2, average grain area and shape coefficient. Results indicate high influence of carbon content on Tliq. Macrostructure of sample castings indicate positive effect of surface and volume modification, however impact of surface modification is more pronounced.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 3; 5-8
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Macrostructure of Nickelbased Superalloys IN713C and MAR 247 on the Characteristics of High-temperature Creep
    Autorzy:
    Cieśla, M.
    Binczyk, F.
    Mańka, M.
    Findziński, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/380019.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    nickel alloy IN-713C
    superalloy Mar-247
    macrostructure
    modification
    creep
    stop niklu IN-713C
    nadstop Mar-247
    modyfikacja
    Opis:
    The study consisted in assessing the influence of surface and volume modification on the characteristics of high-temperature creep of castings made of waste products of nickel-based superalloys IN 713C and the MAR-247. The results of high-temperature creep tests performed under conditions of two variants of research were analysed. The characteristics of creep according to variant I were obtained on the basis of earlier studies of these alloys with the parameters T=982oC, σ=150MPa [1]. Variant II included carrying out creep tests of alloy IN713C with the parameters T=760oC, σ =400MPa and alloy MAR247 with the parameters: T=982oC, σ=200MPa.Developed creep characteristics were compared with the results of these alloys with the parameters according to variant I of the study. It was observed that the conditions of experiments carried out depending upon the value of the creep test temperature and stress with the creep stability depends on the size of the macrograin (I variant of the studies) or such influence was not observed (II variant of the studies). Stability of samples with coarse structure in variant I of creep tests was significantly higher than the samples with fragmented grain. It was found that the observed stability conditions are dependent on the dominant deformation mechanisms under creep tests carried out - diffusion mechanism in variant I and a dislocation mechanism in variant II of the study. The conditions for the formation and growth of the cracks in the tested materials, including the morphological characteristics of their macro-and microstructure were tested.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 4; 11-16
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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