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    Wyświetlanie 1-8 z 8
    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:
    Influence of Modification and Casting Technology on Structure of IN-713C Superalloy Castings
    Autorzy:
    Binczyk, F.
    Cwajna, J.
    Gradoń, P.
    Mańka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/381572.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative casting materials
    innovative casting technologies
    nickel alloy IN-713C
    modification
    cobalt aluminate
    macrostructure
    innowacyjne materiały odlewnicze
    innowacyjne technologie odlewnicze
    stop niklu
    modyfikacja
    kobalt
    makrostruktura
    Opis:
    The paper presents the results concerning impact of modification (volume and surface techniques), pouring temperature and mould temperature on stereological parameters of macrostructure in IN713C castings made using post-production scrap. The ability to adjust the grain size is one of the main issues in the manufacturing of different nickel superalloy castings used in aircraft engines. By increasing the grain size one can increase the mechanical properties, like diffusion creep resistance, in higher temperatures. The fine grained castings. on the other hand, have higher mechanical properties in lower temperatures and higher resistance to thermal fatigue. The test moulds used in this study, supplied by Pratt and Whitney Rzeszow, are ordinarily used to cast the samples for tensile stress testing. Volume modification was carried out using the patented filter containing cobalt aluminate. The macrostructure was described using the number of grains per mm2, mean grain surface area and shape index. Obtained results show strong relationship between the modification technique, pouring temperature and grain size. There was no significant impact of mould temperature on macrostructure.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 3; 11-14
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Creep Behaviour of Modified Mar-247 Superalloy
    Autorzy:
    Cieśla, M.
    Mańka, M.
    Binczyk, F.
    Gradoń, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/354216.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    nickel superalloys
    creep
    macrostructure
    microstructre
    Opis:
    The paper presents the results of analysis of creep behaviour in short term creep tests of cast MAR-247 nickel-based superalloy samples made using various modification techniques and heat treatment. The accelerated creep tests were performed under temperature of 982 °C and the axial stresses of σ = 150 MPa (variant I) and 200 MPa (variant II). The creep behaviour was analysed based on: creep durability (creep rupture life), steady-state creep rate and morphological parameters of macro- and microstructure. It was observed that the grain size determines the creep durability in case of test conditions used in variant I, durability of coarse-grained samples was significantly higher.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 2A; 701-704
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Temperature on the Result of Complex Modification of IN-713C Superalloy Castings
    Autorzy:
    Binczyk, F.
    Gradoń, P.
    Mańka, M.
    Findziński, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/383137.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Innovative casting material
    innovative casting technology
    nickel alloy IN-713C
    modification
    cobalt aluminate
    macrostructure
    innowacyjny materiał odlewniczy
    innowacyjna technologia odlewnicza
    stop niklu IN-713C
    glinek kobaltu
    makrostruktura
    Opis:
    The paper presents the results of research on the determination of the effect of pouring temperature on the macrostructure of the castings subjected to complex (surface and volume) modification and double filtration. Tested castings were made of post-production scrap (gating system parts) of IN-713C superalloy. Tests included the evaluation of the number of grains per 1 mm2, mean grain surface area, shape factor and tensile strength. Casting temperature below 1470 °C positively influenced the modification effect. The grains were finer and the mechanical properties increased, especially for castings with thicker walls. On the other hand, manufacture of thin walled castings of high quality require pouring temperature above 1480 °C.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 4; 13-16
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of a Structure on Durability of Modified Nickel-Base Superalloys in Creep Conditions
    Wpływ struktury na trwałość w warunkach pełzania modyfikowanych nadstopów na bazie niklu
    Autorzy:
    Cieśla, M.
    Mańka, M.
    Gradoń, P.
    Binczyk, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/356799.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    nickel alloys
    creep
    macrostructure
    microstructure
    modification
    stopy niklu
    pełzanie
    makrostruktura
    mikrostruktura
    modyfikacja
    Opis:
    The study assesses the impact of surface and bulk modification and filtration during pouring on a durability under accelerated creep conditions of casts made of IN-713C and MAR-247 nickel superalloys scrap used for manufacturing of aircraft engine parts. The impact of solutionizing (1185°C/2 h) with subsequent ageing (870°C/20 h) on the creep resistance of a casting made from MAR-247 coarse-grained superalloy was also examined. Morphological structure parameters were determined with the use of Met-Ilo software. Macrostructure analysis of casts showed very significant impact of surface modification treatment. Creep test results clearly showed that coarse grained samples of IN-713C and MAR-247 superalloys have higher creep resistance. Moreover alloy MAR-247 had higher creep durability after heat treatment compared to as-cast state.
    W pracy przeprowadzono ocenę wpływu zabiegów modyfikacji powierzchniowej i objętościowej oraz filtracji podczas zalewania form na trwałość w warunkach przyspieszonego pełzania odlewów wykonanych z odpadów poprodukcyjnych nadstopów niklu IN-713C i MAR-247 stosowanych na łopatki turbin silników lotniczych. Analizie poddano również wpływ operacji przesycania (1185°C/20 h) z następnym starzeniem (870°C/20 h) na trwałość pełzaniowa odlewu wytworzonego z stopu MAR-247 o strukturze gruboziarnistej. Badania makrostruktury wykonanych odlewów wykazały bardzo istotny wpływ zabiegu modyfikowania powierzchniowego. Stosując program Met-Ilo określono istotne z punktu widzenia trwałości parametry morfologiczne struktury. Próby pełzania wskazuje, że nadstopy IN-713C i MAR-247 charakteryzujace się wiekszym makroziarnem wykazywały dłuższy czas do zerwania próbki. Ponadto próbki stopu MAR-247 poddane obróbce cieplnej wykazują większą odporność na pełzanie niż próbki w stanie lanym.
    Źródło:
    Archives of Metallurgy and Materials; 2014, 59, 4; 1559-1563
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Surface Modification of Cored, Thin Walled Castings of Nickel Superalloy IN-713C
    Autorzy:
    Binczyk, F.
    Cwajna, J.
    Gradoń, P.
    Mańka, M.
    Findziński, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/381063.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Innovative casting material
    innovative casting technology
    nickel alloy IN-713C
    surface modification
    cobalt aluminate
    macrostructure
    innowacyjny materiał odlewniczy
    innowacyjna technologia odlewnicza
    stop niklu IN-713C
    modyfikacja powierzchni
    glinek kobaltu
    makrostruktura
    Opis:
    In current casting technology of cored, thin walled castings, the modifying coating is applied on the surface of wax pattern and, after the removal of the wax, is transferred to inner mould surface. This way the modification leading to grain refinement occur on the surface of the casting. In thin walled castings the modification effect can also be seen on the other (external) side of the casting. Proper reproduction of details in thin walled castings require high pouring temperature which intensify the chemical reactions on the mould – molten metal interface. This may lead to degradation of the surface of the castings. The core modification process is thought to circumvent this problem. The modifying coating is applied to the surface of the core. The degradation of internal surface of the casting is less relevant. The most important factor in this technology is “trough” modification – obtaining fine grained structure on the surface opposite to the surface reproduced by the core.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 3; 17-20
    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:
    Występowanie Erysiphe alphitoides w drzewostanach dębowych dotkniętych klęską powodzi
    Occurence of Erysiphe alphitoides in oak stands affected by flood disaster
    Autorzy:
    Szewczyk, W.
    Kumiński, R.
    Mańka, M.
    Kwaśna, H.
    Łakomy, P.
    Baranowska-Wasilewska, M.
    Behnke-Borowczyk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1312378.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    lesnictwo
    drzewostany debowe
    drzewostany pokleskowe
    drzewostany popowodziowe
    dab szypulkowy
    Quercus robur
    choroby aparatu asymilacyjnego
    maczniak prawdziwy debu
    Erysiphe alphitoides
    wystepowanie
    defoliacja
    zamieranie drzew
    Nadlesnictwo Wolow
    defoliation
    branch tip withering
    oak decline
    Forest District Wołów
    Opis:
    Pedunculate oak (Quercus robur L.) is the most valuable deciduous tree species in Poland. For almost 30 years, an oak decline resulting from stress factors leading to a decrease of tree vitality in the long-term has been observed. The aim of the present study was to determine the proportion of leaves infected by the fungus Erysiphe alphitoides, the cause of powdery mildew, in post-flood oak stands situated in the Forest District Wołów (51°32’N, 16°62’E) as well as to evaluate effects of powdery mildew with respect to the oak decline. In order to record the powdery mildew incidence, we selected three trees in each of the ten investigated oak stands, and 200 leaves were collected from the upper part of the crowns. The percentage of infected leaves as well as the reduction of carbon assimilation capacity was assessed. Furthermore, we evaluated the average reduction of carbon assimilation capacity and the percentage of withering branch tips in 25 adjacent trees. Incidences of powdery mildew were observed in seven out of the ten stands. The maximum tree damage did not exceed 22% leaf infection and mean defoliation within the study areas ranged from 18% to 61.4%. Non-withering branch tips were observed in one post-flood area as well as in one area situated outside the flooded region. Within the remaining areas studied, the average proportion of withering branch tips ranged from 0.4% to 13.8%. Statistical analyses showed that differences between the investigated stands with regard to the rate of powdery mildew occurrence were not significant. Correlating the means, however, revealed a relationship between powdery mildew incidence and branch tip withering. This relationship is a possible indication of the ongoing oak dieback. No statistically significant relationship between tree defoliation and powdery mildew incidence was found. The lack of statistical significance, as observed here, implies that water stagnation within the investigated stands had no effect on Erysiphe alphitoides infection.
    Źródło:
    Leśne Prace Badawcze; 2015, 76, 1; 73-77
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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