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    Wyświetlanie 1-9 z 9
    Tytuł:
    The Influence of Cyclic Sintering on the Structure and Mechanical Properties of Tungsten Heavy Alloy
    Autorzy:
    Skoczylas, P.
    Kaczorowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/379571.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    tungsten heavy alloy
    multiple sintering
    mechanical properties
    stop ciężki wolframu
    spiekanie wielokrotne
    właściwości mechaniczne
    Opis:
    The results of structure and mechanical properties investigations of tungsten heavy alloy (THA) after cyclic sintering are presented. The material for study was prepared using liquid phase sintering of mixed and compacted powders in hydrogen atmosphere. The specimens in shape of rods were subjected to different number of sintering cycles according to the heating schemes given in the main part of the paper From the specimens the samples for mechanical testing and structure investigations were prepared. It follows from the results of the mechanical studies, that increasing of sintering cycles lead to decrease of tensile strength and elongation of THA with either small or no influence on yield strength. In opposite to that, the microstructure observations showed that the size of tungsten grain increases with number of sintering cycles. Moreover, scanning electron microscope (SEM) observations revealed distinctly more trans-granular cleavage mode of fracture in specimens subjected to large number of sintering cycles compared with that after one or two cycles only.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 4; 131-136
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of Fe content on spreading ability of tungsten heavy alloys matrix on tungsten surface
    Autorzy:
    Kaczorowski, M.
    Skoczylas, P.
    Krzyńska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/383341.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    weight heavy alloy
    microstructure change
    liquid phase sintering
    wolframowy stop ciężki
    zmiana mikrostruktury
    faza ciekła spiekania
    Opis:
    The results of experimental study of tungsten spreading ability with W-Ni-Co-Fe matrix are presented. The aim of these investigations was to see how Fe concentration in W – Ni – Co matrix influences the wettability of tungsten grains during liquid phase sintering. Four green compact specimens containing 50%W, 10%Co and Ni + Fe = 40% but with different Ni to Fe ratio were prepared. The cylindrical specimen 5mm diameter and 5mm height were put on clean pure tungsten substrate and then 20 minutes heated at 1520ºC in hydrogen atmosphere. After heating the specimens were carefully measured and then the specimens for structure observations were prepared. It was concluded, that increase of Fe content decrease the melting temperature of W – Ni – Co alloy. The melting point decrease caused by Fe content increase substantially the spreading ability of tungsten substrate with W – Ni – Co alloy. Metallography investigations showed some microstructure changes in “reaction zone” identified in tungsten substrate – (WNi40-xCo10Fex) interface. The results of the study confirmed our earlier observations that even relative small Fe addition promotes Weight Heavy Alloys (WHA) liquid phase sintering.
    Źródło:
    Archives of Foundry Engineering; 2011, 11, 3 spec.; 103-106
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Degradation of Creep Resistant Ni - alloy During Aging at Elevated Temperature Part II: Structure Investigations
    Autorzy:
    Kaczorowski, M.
    Skoczylas, P.
    Krzyńska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/381511.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Ni-base superalloy
    structure investigations
    SEM observation
    TEM observation
    nadstop niklu
    badanie struktury
    obserwacja SEM
    obserwacja TEM
    Opis:
    The results of structure observations of Ni base superalloy subjected to long-term influence of high pressure hydrogen atmosphere at 750K and 850K are presented. The structure investigation were carried out using conventional light-, scanning- (SEM) and transmission electron microscopy (TEM). The results presented here are supplementary to the mechanical studies given in part I of this investigations. The results of study concerning mechanical properties degradation and structure observations show that the differences in mechanical properties of alloy subjected different temperature are caused by more advanced processes of structure degradation during long-term aging at 850K, compare to that at 750K. Higher service temperature leads to formation of large precipitates of δ phase. The nucleation and growth of needle- and/or plate-like, relative large delta precipitates proceed probably at expense strengthening γ" phases. Moreover, it can't be excluded that the least stable γ" phase is replaced with more stable γ' precipitates. TEM observations have disclosed differences in dislocation structure of alloy aged at 750K and 850K. The dislocation observed in alloy subjected to 750K are were seldom observed only, while in that serviced at high stress and 850K dislocation array and dislocation cell structure was typical.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 4; 45-50
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Test bench for analyzing the lost foam process
    Autorzy:
    Kaczorowski, R.
    Just, P.
    Pacyniak, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/383347.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    casting
    lost foam
    styrofoam patterns
    odlewanie
    tracona piana
    wzorzec styropianowy
    Opis:
    The current work presents and describes the test bench for analyzing the lost foam process, especially measuring of the pressure of gases in the gas gap and continuous measuring of the rate of rise of the bath level when pouring the liquid metal into the mould. A series of preliminary research was carried out on the bench which was aimed at determining the influence of the basic parameters of the process, i.e. the density of the styrofoam pattern, thickness of the refractory coating applied on the pattern, kind of the alloy and the temperature of pouring on the mould cavity by the liquid metal and the pressure of gases in the gas gap.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 1; 57-62
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization of master alloy amount and gating system design for ductile cast iron obtain in lost foam process
    Autorzy:
    Just, P.
    Kaczorowski, R.
    Pacyniak, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/379923.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative casting technologies
    ductile iron
    inmold method
    lost foam casting
    innowacyjna technologia odlewnicza
    żeliwo sferoidalne
    metoda in mold
    tracona piana
    Opis:
    The paper presents the optimization of master alloy amount for the high nodular graphite yield (80-90%) in cast iron obtain in lost foam process. The influence of the gating system configuration and the shape of the reaction chamber, the degree of spheroidisation cast iron was examined. Research has shown that the, optimal of master alloy amount of 1.5% by mass on casting iron. The degree of spheroidisation is also influenced by the gating system configuration. The best spheroidisation effect was obtained for liquid cast iron was fed into the reaction chamber from the bottom and discharged from the top.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 3; 43-46
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Selected Technological Properties of Liquid Ceramic Slurries Used to Produce Moulds in the Replicast cs Technology
    Autorzy:
    Kaczorowski, R.
    Just, P.
    Pacyniak, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/380254.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Innovative casting material
    innovative casting technology
    precision casting
    thin walled ceramic mould
    apparent viscosity
    replicast CS technology
    innowacyjny materiał odlewniczy
    innowacyjna technologia odlewnicza
    odlewanie precyzyjne
    forma ceramiczna cienkościenna
    lepkość pozorna
    technologia Replicast CS
    Opis:
    The study discusses the issues connected with the production of thin-walled ceramic slurry in the replicast cs technology. In the ceramic mould production process, a special role is played by the liquid ceramic slurry used to produce the first layer of the mould. The study examines selected technological properties of liquid ceramic slurries used to produce moulds in the replicas cs technology. The ceramic slurries for the tests were prepared based on the binders Ludox Px30 and Sizol 030, enriched with Refracourse flour. The wettability of the pattern's surface by the liquid ceramic slurry and the dependence of the apparent viscosity on the ceramic flour content in the mixture were determined. The wettability of the pattern surface by the liquid ceramic slurry was determined based on the measurement of the wetting angle. The angle was determined by means of an analysis of the computer image obtained with the use of a CDC camera.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 4; 190-194
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Degradation of Creep Resistant Ni - alloy During Aging at Elevated Temperature Part I: Mechanical Properties
    Autorzy:
    Kaczorowski, M.
    Skoczylas, P.
    Gulbinowicz, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/381428.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    creep resistant alloy
    Ni alloy
    mechanical properties
    hydrogen embrittlement
    stop żarowytrzymały
    stop Ni
    właściwości mechaniczne
    kruchość wodorowa
    Opis:
    The results of experimental study of mechanical properties degradation of creep resistant Ni-base alloy are presented. The material studied was subjected to long-term influence of high pressure hydrogen atmosphere at temperature 750K and 850K. The mechanical properties of specimens taken at different distance from inner surface of thick wall tube were evaluated. The results of mechanical testing showed distinct influence of the temperature on mechanical properties of Ni creep resistant alloy. Moreover, the mechanical properties of studied alloy depend on the location of the specimen with respect to the dissociated ammonia source i.e. distance from the inner surface of the chamber. The results of mechanical testing show that the higher the distance from inner surface of the chamber the better mechanical properties of studied Ni base super-alloy.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 3 spec.; 25-28
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ductile cast iron obtain by lost foam process and inmold method
    Wytwarzanie odlewów z żeliwa sferoidalnego w technologii inmold i lost foam
    Autorzy:
    Kaczorowski, R.
    Just, P.
    Pacyniak, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/350916.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    nodular cast iron (ductile cast iron)
    inmold method
    lost foam casting
    innovative casting technologies
    reaction chamber
    żeliwo sferoidalne
    metoda in mold
    odlew z żeliwa sferoidalnego
    innowacyjne technologie odlewnicze
    komora reakcyjna
    Opis:
    This paper presents a technology of ductile cast iron obtain by lost foam process with use of inmold method. Spheroidization was carried out using master alloy in an amount of 1.5% by mass on casting iron. Research the influence of the gating system configuration and the shape of the reaction chamber, the degree of spheroidization cast iron, which estimated based on the shape of the graphite. Research have shown that the greatest impact on the degree of spheroidization has cast the infusion position relative to the casting inlet and the reaction chamber, and the shape of the reaction chamber.
    W pracy przedstawiono technologię otrzymywania odlewów z żeliwa sferoidalnego metodą inmold z wykorzystaniem procesu pełnej formy. Sferoidyzację prowadzono z użyciem zaprawy sferoidyzująco-modyfikującej w ilości 1,5% na masę sferoidyzowanego żeliwa. Przeprowadzono badania wpływu konfiguracji układu wlewowego oraz kształtu komory reakcyjnej na stopień sferoidyzacji żeliwa, który określono na podstawie wskaźnika kształtu grafitu. Badania wykazały, że największy wpływ na stopień sferoidyzacji żeliwa ma położenie wlewu doprowadzającego względem odlewu i komory reakcyjnej, oraz kształt komory reakcyjnej.
    Źródło:
    Archives of Metallurgy and Materials; 2013, 58, 3; 823-826
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The strengthening of weight heavy alloys during heat treatment
    Autorzy:
    Kaczorowski, M.
    Skoczylas, P.
    Krzyńska, A.
    Kaniewski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/380302.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    utwardzanie wydzieleniowe
    wolframowy stop ciężki
    właściwości mechaniczne
    precipitation hardening
    weight heavy alloys (WHA)
    mechanical properties
    structure
    Opis:
    The results of studies of W-Ni-Co-Fe experimental alloy, with chemical composition assuring a possibility of producing Ni-based supersaturated solid solution are presented. The alloy was prepared from tungsten, nickel, cobalt and iron powders which were first mixed then melted in a ceramic crucible where they slowly solidified in hydrogen atmosphere. Next specimens were cut from the casting and heated at a temperature 950oC. After solution treatment the specimens were water quenched and then aged for 20 h at a temperature 300oC. The specimens were subjected to microhardness measurements and structure investigations. The latter included both conventional metallography and SEM observations. Moreover, for some specimens X-ray diffractometry studies and TEM investigations were conducted. It was concluded that quenching lead to an increase of tungsten concentration in nickel matrix which was confirmed by Ni lattice parameter increase. Aging of supersaturated solid solution caused strengthening of the Ni-based matrix, which was proved by hardness measurements. The TEM observation did not yield explicit proofs that the precipitation process could be responsible for strengthening of the alloy.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 4; 75-80
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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