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    Wyświetlanie 1-8 z 8
    Tytuł:
    Analysis of the Graphite Shape in Cast Iron Obtaining by Inmold Process
    Autorzy:
    Gumienny, G.
    Kurowska, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/381705.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    theory of crystallization
    inmold process
    graphite shape
    teoria krystalizacji
    technologia inmold
    żeliwo sferoidalne
    Opis:
    The paper presents results of research on the effect of magnesium on the graphite shape in cast iron obtained by Inmold process. For testing Lamet® 5504 master alloy was used. The crystallization process of cast iron with various Mg concentrations was evaluated with use of the thermal and derivative analysis (TDA) method. The conditions were demonstrated for which a flake, vermicular and nodular graphite were obtained. Values of graphite “c” coefficient were analyzed. Results from it the significant differences between the assessment of the graphite on metallographic specimen and by the "c" coefficient. An effect of wall thickness of the casting on the graphite coefficient was indicated.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 3 spec.; 15-20
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of the Hold Time and Temperature on Characteristic Quantities of TDA Curves
    Autorzy:
    Szymczak, T.
    Gumienny, G.
    Pacyniak, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/382413.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    theory of crystallization
    pressure die casting
    TDA method
    teoria krystalizacji
    odlewnictwo ciśnieniowe
    metoda ATD
    Opis:
    This paper presents the effect of the temperature and hold time in the holding furnace of 226 silumin on the characteristic quantities of TDA curves. The temperature of phase transformations and the cooling rate were tested. It has been shown that increasing both the hold time and the temperature in the holding furnace cause the decreasethe end ofα+Al9Fe3Si2+β and α+Al2Cu+β ternary eutectics crystallization temperature in the tested silumin. This is due to the fact an increase in amounts of impurities as a result of reacting the liquid alloy with the gases contained in the air. It has been shown, however, that examined technological factors of the metal preparation do not cause systematic changes in the cooling rate.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 1; 113-116
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Copper in Ausferritic Compacted Graphite Iron
    Autorzy:
    Gumienny, G.
    Kacprzyk, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/381542.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    theory of crystallization
    compacted graphite iron
    ausferrite
    DTA method
    teoria krystalizacji
    stop żelaza
    ausferyt
    metoda DTA
    Opis:
    This paper shows how it is possible to obtain an ausferrite in compacted graphite iron (CGI) without heat treatment of castings. Vermicular graphite in cast iron was obtained using Inmold technology. Molybdenum was used as alloying additive at a concentration from 1.6 to 1.7% and copper at a concentration from 1 to 3%. It was shown that ausferrite could be obtained in CGI through the addition of molybdenum and copper in castings with a wall thickness of 3, 6, 12 and 24 mm. Thereby the expensive heat treatment of castings was eliminated. The investigation focuses on the influence of copper on the crystallization temperature of the graphite eutectic mixture in cast iron with the compacted graphite. It has been shown that copper increases the eutectic crystallization temperature in CGI. It presents how this element influences ausferrite microhardness as well as the hardness of the tested iron alloy. It has been shown that above-mentioned properties increases with increasing the copper concentration.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 1; 162-166
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Copper on the Crystallization Process, Microstructure and Selected Properties of CGI
    Autorzy:
    Gumienny, G.
    Kacprzyk, B.
    Gawroński, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/381656.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    theory of crystallization
    compacted graphite iron
    copper
    DTA method
    teoria krystalizacji
    zagęszczone żelazo grafitowe
    miedź
    metoda DTA
    Opis:
    The paper presents the results of the research on the effect of copper on the crystallization process, microstructure and selected properties of the compacted graphite iron. Compacted graphite in cast iron was obtained using Inmold process. The study involved the cast iron containing copper at a concentration up to approximately 4%. The effect of copper on the temperature of the eutectic crystallization as well as the temperature of start and finish of the austenite transformation was given. It has been shown that copper increases the maximum temperature of the eutectic transformation approximately by 5 oC per 1% Cu, and the temperature of the this transformation finish approximately by 8 o C per 1% Cu. This element decreases the temperature of the austenite transformation start approximately by 5 oC per 1% Cu, and the finish of this transformation approximately by 6oC per 1% Cu. It was found that in the microstructure of the compacted graphite iron containing about 3.8% Cu, there are still ferrite precipitations near the compacted graphite. The effect of copper on the hardness of cast iron and the pearlite microhardness was given. This stems from the high propensity to direct ferritization of this type of cast iron. It has been shown copper increases the hardness of compacted graphite iron both due to its pearlite forming action as well as because of the increase in the pearlite microhardness (up to approx. 3% Cu). The conducted studies have shown copper increases the hardness of the compacted graphite iron approximately by 35 HB per 1% Cu.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 1; 51-56
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Vanadium and Molybdenum on the Crystallization, Microstructure and Properties of Hypoeutectic Silumin
    Autorzy:
    Szymczak, T.
    Gumienny, G.
    Pacyniak, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/382228.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    theory of crystallization
    pressure die casting
    multicomponent silumin
    TDA method
    teoria krystalizacji
    odlewanie ciśnieniowe
    silumin wieloskładnikowy
    metoda ATD
    Opis:
    The paper presents the results of hypoeutectic silumin 226 grade and silumin produced on its basis through the addition of V and Mo. Vanadium and molybdenum were added as the preliminary alloy AlV10 and AlMo8 in an amount providing the concentration of 0.1; 0.2; 0.3 and 0.4% V and Mo. TDA curves of tested silumins were presented; regardless of the chemical composition there were similar thermal effects. Pressure castings microstructure research revealed the presence in silumins with the addition of V and Mo phases do not occur in silumin without these additives. These phases have a morphology similar to the walled, and their size increases with increasing concentration of V and Mo. The size of the precipitates of these phases silumin containing 0.1% V and Mo does not exceed 10 microns, while 0.4% of the content of these elements increases to about 80 microns. Tests of basic mechanical properties of silumins were carried out. It has been shown that the highest values of tensile strength Rm = 295 MPa and elongation A = 4.2% have silumin containing approximately 0.1% V and Mo. Increasing concentrations of these elements causes a gradual lowering of the Rm and A values.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 4; 81-86
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Chromium on the Solidification Process and Microstructure of Vermicular Graphite Cast Iron
    Autorzy:
    Gumienny, G.
    Dondzbach, M.
    Kacprzyk, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/381406.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    theory of crystallization
    vermicular graphite cast iron
    crystallization
    TDA method
    teoria krystalizacji
    żeliwo grafitowe wermikularne
    proces krystalizacji
    metoda ATD
    Opis:
    The paper presents the results of studies of the effect of chromium concentration on the solidification process, microstructure and selected properties of cast iron with vermicular graphite. The vermicular graphite cast iron was obtained by an Inmold process. Studies covered the cast iron containing chromium in a concentration at which graphite is still able to preserve its vermicular form. The effect of chromium on the temperature of eutectic crystallization and on the temperature of the start and end of austenite transformation was discussed. The conditions under which, at a predetermined chromium concentration, the vermicular graphite cast iron of a pearlitic matrix is obtained were presented, and the limit concentration of chromium was calculated starting from which partial solidification of the cast iron in a metastable system takes place. The effect of chromium on the hardness of cast iron, microhardness of individual phases and surface fraction of carbides was disclosed.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 3; 29-34
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of the remelting on transformations in Co-Cr-Mo prosthetics alloy
    Autorzy:
    Kacprzyk, B.
    Szymczak, T.
    Gumienny, G.
    Klimek, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/382914.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    theory of crystallization
    remelting
    thermal analysis
    derivative analysis
    microstructure
    composition
    alloys properties
    prosthetics alloys
    teoria krystalizacji
    przetapianie
    analiza termiczna
    analiza derywacyjna
    mikrostruktura
    właściwości stopu
    stop protetyczny
    Opis:
    In the article we were studing the impact of the remelting on transformations in Co-Cr-Mo prosthetics alloy. The TDA curves were analyzed, the microstructure was examined, the analysis of the chemical composition and hardness using the Brinell method was made. It was found that the obtained microstructure of the alloys that we studied do not differ significantly. In all four samples, microscopic images were similar to each other. The volume, size and distribution of the phases remain similar. Analysis of the chemical composition showed that all the samples fall within the compositions provided for the test alloy. Further to this the hardness of the samples, regardless of the number of remeltings did not show any significant fluctuations and remained within the error limit. After analyzing all the results, it can be concluded that the remeltings of the alloys should not have a significant impact on their properties. Secondarily melted alloys can be used for prosthetics works.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 3; 47-50
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Cr and W on the Crystallization Process, the Microstructure and Properties of Hypoeutectic Silumin to Pressure Die Casting
    Autorzy:
    Szymczak, T.
    Gumienny, G.
    Pacyniak, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/381777.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    theory of crystallization
    innovative foundry
    innovative foundry materials
    pressure die casting
    multicomponent silumin
    DTA method
    teoria krystalizacji
    innowacyjna odlewnia
    innowacyjne materiały odlewnicze
    odlewnictwo ciśnieniowe
    siluminy
    metoda DTA
    Opis:
    This article presents the results of studies in the hypoeutectic silumin destined for pressure die casting with the simultaneous addition of chromium and tungsten. The study involved the derivative and thermal analysis of the crystallization process, metallographic analysis and mechanical properties testing. Silumin 226 grade was destined for studies. It is a typical silumin to pressure die casting. AlCr15 and AlW8 preliminary alloys were added to silumin. Its quantity allowed to obtain 0.1, 0.2, 0.3 and 0.4% of Cr and W in the tested alloy. Studies of the crystallization process as well as the microstructure of the silumin poured into DTA sampler allowed to state the presence of additional phase containing 0.2% or more Cr and W. It has not occurred in silumin without the addition of above mentioned elements. It is probably the intermetallic phase containing Cr and W. DTA studies have shown this phase crystallizes at a higher temperature range than α (Al) solid solution. In the microstructure of each pressure die casting containing Cr and W the new phases formed. Mechanical properties tests have shown Cr and W additives in silumin in an appropriate amount may increase its tensile strength Rm (about 11%), the yield strength Rp0.2 (about 21%) and to a small extent elongation A.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 3; 109-114
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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