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    Tytuł:
    Thermodynamic analysis of cast irons solidification with various types of graphite
    Autorzy:
    Elbel, T.
    Hampl, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/380412.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    pomiar aktywności tlenu
    energia swobodna Gibbsa
    krzepnięcie żeliwa
    continuous oxygen activity measurement
    calculation of Gibbs free energy
    cast iron solidification
    Opis:
    The contribution summarises the results of oxygen activity determinations, which were measured and registered continuously in castings from cast irons with various types of graphite. The results were used to find the relationship between two variables: natural logarithm of oxygen activities and reverse value of thermodynamic temperature 1 /T. Obtained regression lines were used to calculate oxygen activity at different temperatures, to calculate Gibbs free energy \deltaG at the different temperatures and to calculate the single \deltaG value for significant temperature of the graphite solidification. The results were processed by a statistical analysis of data files for the different types of graphite with flake, vermicular and spheroidal graphite. Each material has its proper typical oxygen activities range and individual temperature function of Gibbs free energy for analysing and governing casting quality.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 4; 157-165
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prediction of Microstructure of Grey Cast Irons by Electrical Resistivity Measurements
    Autorzy:
    Petrič, M.
    Mrvar, P.
    Kastelic, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/354044.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solidification
    grey cast iron
    electrical resistivity
    graphite shape
    microstructure
    Opis:
    The paper describes the influence of graphite shape, size and amount to electrical properties of different cast irons. Experiments of electrical resistivity measurements were conducted during solidification of four different melts in different time intervals from melt treatment by inoculation and nodularization. Metallographic analyses were made in order to determine the shape, size, distribution and amount of graphite and correlate results with electrical resistivity measurements. It was found out that nodular graphite is giving the lowest electrical resistivity and is decreased during solidification. Electrical resistivity of lamellar cast iron is increased during solidification since lamellas interrupt metal matrix severely. There is no significant difference in resistivity of vermicular cast iron from nodular cast iron. Smaller size of graphite and lower amount of graphite and higher amount of metal matrix also decrease resistivity.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 1; 365-369
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of chemical composition on number of eutectic colonies in Ni-Mn-Cu cast iron
    Autorzy:
    Janus, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/383322.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    eutectic graphite colonies
    solidification
    austenitic cast iron
    cast iron Ni-Mn-Cu
    eutektyka grafitowa
    krzepnięcie
    żeliwo austenityczne
    żeliwo Ni-Mn-Cu
    Opis:
    Determined were direction and intensity of influence of alloying additions on the number of eutectic graphite colonies in austenitic cast iron Ni-Mn-Cu. Chemical composition of the cast iron was 1.7 to 3.3% C, 1.4 to 3.1% Si, 2.8 to 9.9% Ni, 0.4 to 7.7% Mn, 0 to 4.6% Cu, 0.14 to 0.16% P and 0.03 to 0.04% S. Analysed were structures of mottled (20 castings) and grey (20 castings) cast iron. Obtained were regression equations determining influence intensity of individual components on the number of graphite colonies per 1 cm2 (LK). It was found that, in spite of high total content of alloying elements in the examined cast iron, the element that mainly decides the LK value is carbon, like in a plain cast iron.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 1; 51-56
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An inoculation phenomenon in cast iron
    Zagadnienie modyfikacji żeliwa
    Autorzy:
    Fraś, E.
    Górny, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/354260.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ziarna eutektyki
    modyfikacja żeliwa
    żeliwo sferoidalne
    cast iron
    solidification
    inoculation
    structure
    eutectic cells
    Opis:
    The paper presents a solidification sequence of graphite eutectic cells of A and D types, as well as globular and cementite eutectics. The morphology of eutectic cells in cast iron, the equations for their growth and the distances between the graphite precipitations in A and D eutectic types were analysed. We observed a critical eutectic growth rate at which one type of eutectic transformed into another. A mathematical formula was derived that combined the maximum degree of undercooling, the cooling rate of cast iron, eutectic cell count and the eutectic growth rate. One type of eutectic structure turned smoothly into the other at a particular transition rate, transformation temperature and transformational eutectic cell count. Inoculation of cast iron increased the number of eutectic cells with flake graphite and the graphite nodule count in ductile iron, while reducing the undercooling. An increase in intensity of inoculation caused a smooth transition from a cementite eutectic structure to a mixture of cementite and D type eutectic structure, then to a mixture of D and A types of eutectics up to the presence of only the A type of eutectic structure. Moreover, the mechanism of modification of cast iron was studied.
    W pracy podano sekwencję krystalizacji ziaren eutektyki grafitowej typu A i D oraz kulkowej a także eutektyki cementytowej. Przeanalizowano morfologię tych ziaren w żeliwie oraz równania na prędkość wzrostu ziaren oraz odległość miedzy wydzieleniami grafitu typu A i D. Wykazano, że istnieją krytyczne prędkości wzrostu eutektyki, przy których jeden rodzaj eutektyki przekształca sie w drugi. Wyprowadzono ogólne równanie wiążące stopień przechłodzenia eutektyk z szybkością stygnięcia żeliwa, liczba ziaren eutektycznych i prędkością ich wzrostu. Wykazano, że istnieje prędkość transformacji, temperatura transformacji i transformacyjna liczba ziaren, przy których jeden rodzaj eutektyki przechodzi płynnie w drugi. Modyfikacja żeliwa zwiększa liczbę ziaren eutektycznych w żeliwie z grafitem płatkowym i liczbę kulek grafitu w żeliwie sferoidalnym oraz zmniejsza przechłodzenie. Powiększenie intensywności modyfikacji powoduje płynne przejście od eutektyki cementytowej poprzez mieszaniny eutektyk typu D i cementytowej, eutektyk typu D i A aż do wyłącznie eutektyki typu A. Podano mechanizm modyfikacji żeliwa.
    Źródło:
    Archives of Metallurgy and Materials; 2012, 57, 3; 768-777
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of alloying elements on solidification of primary austenite in Ni-Mn-Cu cast iron
    Autorzy:
    Janus, A.
    Kurzawa, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/382123.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    primary austenite
    solidification process
    austenitic cast iron
    Ni-Mn-Cu cast iron
    austenit pierwotny
    proces krzepnięcia
    żeliwo austenityczne
    żeliwo Ni-Mn-Cu
    Opis:
    Within the research, determined were direction and intensity of alloying elements influence on solidification way (directional or volumetric) of primary austenite dendrites in hypoeutectic austenitic cast iron Ni-Mn-Cu. 50 cast shafts dia. 20 mm were analysed. Chemical composition of the alloy was as follows: 1.7 to 3.3 % C, 1.4 to 3.1 % Si, 2.8 to 9.9 % Ni, 0.4 to 7.7 % Mn, 0 to 4.6 % Cu, 0.14 to 0.16 % P and 0.03 to 0.04 % S. The discriminant analysis revealed that carbon influences solidification of primary austenite dendrites most intensively. It clearly increases the tendency to volumetric solidification. Influence of the other elements is much weaker. This means that the solidification way of primary austenite dendrites in hypoeutectic austenitic cast iron Ni-Mn-Cu does not differ from that in an unalloyed cast iron.
    Źródło:
    Archives of Foundry Engineering; 2011, 11, 2 spec.; 93-96
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Inoculation of grey cast iron with master alloys containing strontium and zirconium
    Autorzy:
    Soiński, M. S.
    Jędrecki, P.
    Grzesiak, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/383343.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solidification process
    cast iron
    inoculation
    mechanical properties
    proces krzepnięcia
    żeliwo szare
    właściwości mechaniczne
    Opis:
    The effectiveness of cast iron inoculation performed by means of three various inoculants: FeSiSr–SYSTR 75 AV, FeSiZr–SYZR 25 AV and Zircinoc was determined. The inoculants were introduced to the cast iron during the pouring of production moulds. Examination of cast iron structure and mechanical properties were carried out for specimens cut out of the collars of the cast valve bodies. It was found that the quantity of eutectic cells increased to the greatest degree if FeSiZr–SYZR 25 AV inoculant was applied in quantities of 0.20% or 0.25%. This inoculant in the mentioned quantities also increases the tensile strength to the greatest degree, rising it to the level of 250-265 MPa.
    Źródło:
    Archives of Foundry Engineering; 2011, 11, 3 spec.; 195-198
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Boron on Crystallization and Microstructure of Ductile Cast Iron
    Autorzy:
    Dojka, R.
    Studnicki, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/379815.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solidification process
    metallography
    ductile cast iron
    boron
    TDA
    proces krzepnięcia
    metalografia
    żeliwo sferoidalne
    bor
    Opis:
    The objective of the research was to determine the influence of boron on the crystallization process and microstructure of ductile cast iron. In the case of ductile cast iron it is a vital issue because even as little as trace presence of boron changes the properties of ductile cast iron in a significant way. With the use of a new ATD-4 (TDA) tester and CRYSTALDIGRPAH converter it was possible to measure the crystallization process parameters of the same alloy with four different contents of boron in one mould. Four samples with different boron contents were extracted, their microhardness was measured and quantitative analysis of microstructure was conducted. Obtained results allowed to state that with increasing content of boron the amount of graphite precipitates decreases, the amount of pearlite precipitates increases, the shape of graphite precipitates deteriorates and hardness increases. It is also planned to perform additional testings with boron contents between previously tested values.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 2; 15-20
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of the Effect of Solidification Time and Addition Amount of Inoculation on Microstructure and Hardness in Lamellar Graphite Cast Iron
    Autorzy:
    Çolak, Murat
    Uslu, Emin
    Teke, Çağatay
    Şafak, F.
    Erol, Ő.
    Erol, Y.
    Çoban, Y.
    Yavuz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2203933.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    lamellar graphite
    graphite cast iron
    inoculation
    solidification time
    modeling
    grafit
    żeliwo
    wszczepienia
    czas krzepnięcia
    modelowanie
    Opis:
    Material suppliers typically recommend different additive amounts and applications for foundry practices. Therefore, even in the production of the same standard materials, different results may be obtained from various production processes on different foundry floors. In this study, the liquid metal prepared with the addition of different proportions of a FeSi-based inoculation, which is most commonly used in foundries in the production of a cast iron material with EN-GJL-250 lamellar graphite cast iron, was cast into sand molds prepared with a model designed to provide different solidification times. In this way, the optimization of the inoculation amounts on the casting structure for different solidification times was investigated. In addition, hardness values were determined depending on solidification time in varying amounts of inoculation additions. SolidCast casting simulation software was used to determine the casting model geometry and solidification time. In the scope of the study, sand casting, modeling, microstructure analysis, image analysis, microstructure analysis, and hardness tests techniques were used. When the results are examined, the required amount of inoculation for the optimal structure is optimized for the application procedure depending on the casting module and the solidification time.
    Źródło:
    Archives of Foundry Engineering; 2022, 22, 4; 24--33
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Badania symulacyjne (z wykorzystaniem metod obliczeń numerycznych) zalewania i krzepnięcia wybranych odlewów stopów żelaza
    Simulation studies (using methods of numerical calculations) of pouring and solidification of selected iron alloy castings
    Autorzy:
    Gwiżdż, A.
    Pysz, S.
    Gonera, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/391834.pdf
    Data publikacji:
    2012
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa
    Tematy:
    komputerowe wspomaganie produkcji odlewniczej
    symulacja krzepnięcia
    żeliwo i staliwo
    computer-aided casting manufacture
    simulation of solidification
    cast iron and cast steel
    Opis:
    W artykule przedstawiono wyniki komputerowej symulacji MAGMASoft i MAGMAIron zalewania i krzepnięcia w technologii wytwarzania odlewu ze staliwa 35GSM oraz odlewów z żeliwa sferoidalnego GJS400-15 i GJS600-3. Na podstawie założonej technologii wyjściowej przedstawiono wyniki tej symulacji w postaci rysunków 3D technologii odlewania, wybranych kolejnych faz krzepnięcia oraz porowatości końcowej w analizowanej technologii. Na podstawie tej symulacji wprowadzono zmiany w technologii odlewania, wykonano ponownie symulację komputerową nowej technologii, porównując rezultaty z technologią wyjściową.
    The results of computer simulation carried out on MAGMAsoft and MAGMAiron programmes were presented for the technology of pouring and solidification of 35GSM steel castings and GJS400-15 and GJS600-3 ductile iron castings. Based on the assumed starting technology guidelines, the results of this simulation were presented in the form of 3D drawings of the casting technology, including also the selected successive stages of solidification and final porosity in the examined castings. Based on the results of the simulation, changes were introduced to the casting technology, computer simulation was performed once again for the revised technology, and new results were compared with the starting ones.
    Źródło:
    Prace Instytutu Odlewnictwa; 2012, 52, 2; 31-49
    1899-2439
    Pojawia się w:
    Prace Instytutu Odlewnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Methodology of Comparative Validation of Selected Foundry Simulation Codes
    Autorzy:
    Ignaszak, Z.
    Popielarski, P.
    Hajkowski, J.
    Codina, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/379771.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solidification process
    castings defect
    simulation codes
    cast iron
    macromodel
    micro model
    proces krzepnięcia
    wada odlewu
    żeliwo
    model makro
    model mikro
    Opis:
    The validation of each simulation code used in foundry domain requires individual approach due to its specificity. This validation can by elaborated on the basis of experimental results or in particular cases by comparison the simulation results from different codes. The article concerns the influence of grey cast iron density curve and different forms of solid fraction curve Fs=f(T) on the formation of shrinkage discontinuities. Solid fraction curves applying Newtonian Thermal Analysis (NTA) were estimated. The experimental and numerical simulation tests were performed on the castings, which were made with Derivative Thermal Analysis (DerTA) standard cups. The numerical tests were realized using NovaFlow&Solid (NF&S), ProCast and Vulcan codes. In this work, the coupled influence of both curves on the dynamics of the shrinkage-expansion phenomena and on shrinkage defects prognosis in grey cast iron castings has been revealed. The final evaluation of the simulation systems usefulness should be based on validation experiment, preceded by comparing the simulation results of available systems which are proposed in given technology.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 4; 37-44
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Surface Hardening of Nodular Cast Iron by GTAW Remelting
    Autorzy:
    Orłowicz, A. W.
    Trytek, A.
    Korzeniowski, M.
    Kupiec, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/379624.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    solidification process
    mechanical properties
    nodular cast iron
    GTAW process
    surface layer
    proces krzepnięcia
    właściwości mechaniczne
    żeliwo sferoidalne
    proces GTAW
    warstwa powierzchniowa
    Opis:
    The study reported in this paper was aimed at establishing the effect of values of parameters characterizing the process of superficial remelting of a nodular iron casting on the quantity of introduced heat, geometry of remeltings as well as parameter λ and hardness of cementite eutectic. The remelting process was carried out using GTAW method, at electric arc length of 3 mm in argon atmosphere, welding current intensities I = 50, 130, 210, and 300 A, and electric arc scanning speeds vs = 200, 400, and 800 mm/min. The measurements included estimation of the quantity of heat introduced to the casting in the electric arc-induced remelting process with the use of flow calorimeter. Widths and depths of remetlings were assessed with the use of metallographic method. As a result of fast solidification, cementite eutectic was obtained in remelted material in which, in the course of cooling down to ambient temperature, austenite was subject to partial transformation into martensite. To characterize the cementite eutectic, value of the structural parameter λ was assessed. Values of the parameter were similar for areas of occurrence of both fibrous and laminated eutectic. Remeltings were examined at half of their depths. Micro-hardness measurements were taken in the same areas. The established quantitative relationships may prove to be useful in practice for the purpose of predicting values of parameter λ and hardness of remeltings in studies aimed at improving resistance of cast-iron castings to abrasive wear.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 3; 53-58
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Heat Treatment of the SiMo Iron Castings - Case Study in the Automotive Foundry
    Autorzy:
    Cygan, B.
    Stawarz, M.
    Jezierski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/379738.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heat treatment
    solidification process
    SiMo cast iron
    exhaust manifold
    automotive parts
    obróbka termiczna
    proces krzepnięcia
    żeliwo SiMo
    kolektor wydechowy
    części samochodowe
    Opis:
    Silicon – molybdenum cast iron commonly called SiMo due to its unique properties has becoming more and more interesting engineering material. The history and development of this alloy is relatively long but, due to the significant difficulties during the manufacturing process resulting in the lower final quality than expected, it has not been applied to often in practice. The biggest challenge is its brittleness as a result of the carbides precipitations. During last few years, thanks to the many important researches made and the general foundry technology development, the interest in SiMo iron has been rapidly growing, especially for the castings for heavy duty applications like corrosion, high temperature and wear abrasion resistant parts. In the article the heat treatment attempts to improve the microstructure of SiMo castings has been presented. The goal was to destroy or at least to refine and uniformly distribute the carbides precipitations to improve mechanical properties of the exhaust manifold castings for the cars. The experiments were carried out for the alloy contains approx. 4% Si, 1% Mo and 3.2%C. The range of the research included: hardness measuring, standard mechanical properties and microstructure for as-cast state and after that the subsequent heat treatment process with another properties check. The result of the heat treatment was the elimination of pearlite from the metal matrix. Moreover, the changes of the carbide molybdenum – rich phase morphology were observed. The dispersion of the carbides precipitations in the carbides area was observed. The experiments proved the possibility to control the microstructure and the mechanical properties of the SiMo castings by means of heat treatment but only to some extent.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 4; 103-109
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zastosowanie programu Flow-3D do symulacji procesu zalewania oraz krzepnięcia odlewów z żelaza sferoidalnego. Cz. 1
    Use of Flow-3D program for simulation of pouring and solidification process of ductile cast iron castings. Part 1
    Autorzy:
    Gwiżdż, A.
    Małysza, M.
    Nowak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/391733.pdf
    Data publikacji:
    2013
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa
    Tematy:
    produkcja odlewnicza
    symulacja zalewania i krzepnięcia
    armatura żeliwna
    sieć gazowa
    casting production
    simulation of pouring and solidification
    cast iron fittings
    gas network
    Opis:
    Przeprowadzono analizę symulacyjną zalewania i krzepnięcia odlewów z żeliwa sferoidalnego EN-GJS-400-15 zasuw miękko uszczelnionych do sieci gazowych z rur PE. Analiza ta przeprowadzona została w programie Flow-3D. Na podstawie dostarczonych przez Fabrykę Armatur JAFAR SA dokumentacji dwuwymiarowej wykonane zostały bryły przestrzenne w programie CAD, które następnie zostały poddane analizie symulacyjnej odlewania oraz krzepnięcia dla zasuw trzech wielkości DN50, DN100 i DN150. W niniejszej pracy przedstawiono analizę dotyczącą odlewów żeliwnych składających się na zasuwę wielkości DN150. Analiza objęła różne warianty technologii odlewnia i była podstawą do wyboru optymalnej technologii, na podstawie, której wykonano dokumentację konstrukcyjną płyt modelowych i modeli do wykonania prototypowych odlewów. Zastosowanie programu Flow-3D do symulacji zalewania i krzepnięcia odlewów do zasuw mniejszych DN50 zostanie przedstawione w części II.
    Pouring and solidification of EN-GJS-400-15 ductile cast iron castings of soft wedge gate valves for PE pipes used in gas pipelines was simulated. The analysis was performed in Flow-3D program. On the basis of the two-dimension documentation provided by Fabryka Armatur JAFAR SA, three-dimension solids were prepared in CAD, which were subsequently subject to simulation analysis of pouring and solidification of castings of gate valves of three sizes: DN50, DN100 and DN150. This paper presents theanalysis of iron castings forming DN150 gate valve. The analysis covered different technologies of casting and was the basis for selecting the optimum casting technology, which became the basis for the preparation of design documentation of match plates and models for the performance of prototype castings. The use of Flow-3D program for the simulation of pouring and solidification process of castings for smaller DN50 gate valves will be described in part II.
    Źródło:
    Prace Instytutu Odlewnictwa; 2013, 53, 1; 35-53
    1899-2439
    Pojawia się w:
    Prace Instytutu Odlewnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Intermetallic Phases in Alloyed Cast Iron with 18%Si Addition
    Autorzy:
    Stawarz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/946866.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    theory of crystallization
    solidification process
    intermetallic phases
    spheroidal graphite
    silicon cast iron
    teoria krystalizacji
    proces krzepnięcia
    fazy międzymetaliczne
    grafit sferoidalny
    żeliwo silikonowe
    Opis:
    The paper presents an analysis of a selected grade of high silicon cast iron intended for work in corrosive and abrasive conditions. The text describes its microstructure taking into account the process of crystallization, TDA analysis, EDS, XRD and the chemical composition analysis. In order to determine the phase composition, X-ray diffraction tests were carried out. The tests were executed on a Panalytical X'Pert PRO X-ray diffractometer with filtration of radiation from a lamp with copper anode and PIXcel 3D detector on the deflected beam axis. Completed tests allowed to describe the microstructure with detailed consideration of intermetallic phases present in the alloy. Results of the analysis of the examined alloy clearly show that we deal with intermetallic phases of Fe3Si, Fe5Si3 types, as well as silicon ferrite and crystals of silicon. In the examined alloy, we observed the phenomenon of segregation of carbon, which, as a result of this process, enriches the surface of silicon crystals, not creating a compound with it. Moreover, the paper demonstrates capability for crystallization of spheroidal graphite in the examined alloy despite lack of elements that contribute to balling in the charge materials.
    Źródło:
    Archives of Foundry Engineering; 2020, 20, 2; 37-42
    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:
    Zastosowanie programu Flow-3D do symulacji procesu zalewania oraz krzepnięcia odlewów z żeliwa sferoidalnego. Cz. II
    Application of the Flow-3D software for simulation of the spheroidal iron casting and solidification. Part II
    Autorzy:
    Gwiżdż, A.
    Małysza, M.
    Nowak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/391858.pdf
    Data publikacji:
    2013
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa
    Tematy:
    produkcja odlewnicza
    wspomaganie komputerowe
    symulacja zalewania i krzepnięcia
    armatura żeliwna
    instalacja gazowa
    sieć gazowa
    computer aiding
    casting production
    casting and solidification simulation
    cast iron fittings
    gas transmission system
    Opis:
    Przeprowadzono analizę symulacyjną zalewania i krzepnięcia odlewów z żeliwa sferoidalnego EN-GJS-400-15 zasuw miękko uszczelnionych do sieci gazowych z rur PE. Analiza ta przeprowadzona została w programie Flow-3D. Na podstawie dostarczonych przez Fabrykę Armatur JAFAR SA dokumentacji wykonane zostały bryły przestrzenne, które następnie zostały poddane analizie symulacyjnej procesu zalewania oraz krzepnięcia dla zasuw trzech wielkości DN50, DN100 i DN150. W części I artykułu [2] przedstawiono analizę symulacyjną dotyczącą zasuwy DN150, a w niniejszej publikacji, będącej częścią II, symulację dotyczącą zasuwy DN50.
    A simulation analysis was carried out on the casting and solidification of EN-GJS-400-15 spheroidal iron for production of soft-sealed wedge gates for PE pipe gas networks. The analysis was made in the Flow-3D software. Based on the engineering documentation provided by Fabryka Armatur JAFAR SA spatial bodies were developed and analysed by simulation of the casting and solidification processes of wedge gates in three sizes: DN50, DN100 and DN150. Part I of the work [2] presents the simulation analysis for the DN150 gate; this section of the work, i.e. Part II, the simulation applies to the DN50 gate.
    Źródło:
    Prace Instytutu Odlewnictwa; 2013, 53, 2; 29-40
    1899-2439
    Pojawia się w:
    Prace Instytutu Odlewnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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