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    Wyświetlanie 1-13 z 13
    Tytuł:
    Effect of Cooling Rate and Pouring Temperature on the Hardness and Wear Resistance of Bronze SAE660
    Autorzy:
    Karimifer, S.
    Vahdat, S. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/379943.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    microstructure
    bearing
    pouring
    casting
    mikrostruktura
    łożysko
    odlewanie
    Opis:
    Metallic bearing alloys have different types, most of which are tin (Babbitt) or bronze based. Bronze bearings are used at heavy duty conditions. The goal of this research is an investigation on the effect of cooling rate and pouring temperature (two important factors in casting production) on the Brinell hardness and pin-on-disc wear resistance (two important properties in bearing applications) of bronze SAE660. The melt had prepared by induction furnace. Then, it had poured in sand mold in four different casting conditions, including pouring temperatures of 950 ºC and 1200 ºC, and cooling with water and air. Finally, the microstructure, hardness and wear resistance of the SAE660 had investigated. The results indicated that if the maximum hardness, along with the minimum weight loss due to wear (or maximum wear resistance) is required; the contents of intermetallic compounds, lead phase and the solid solution phase should be more. In this way, the samples which are cooled in air and poured at 950 ºC have the high hardness and the lowest weight loss.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 3; 144-151
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Tin Bronze Melting and Pouring Parameters on Its Properties and Bells’ Tone
    Autorzy:
    Bartocha, D.
    Baron, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/382015.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    tin bronze
    melting parameters
    pouring parameters
    bell’s tone
    brąz cynowy
    parametry wytapiania
    parametry zalewania
    ton dzwonu
    Opis:
    The most important feature of bells is their sound. Its clarity and beauty depend, first of all, on the bell’s geometry - particularly the shape of its profile, but also on the quality of alloy used to its cast. Hence, if the melting and pouring parameters could influence the alloy’s properties, what influence they would have on the frequencies of bell’s tone. In the article authors present their own approaches to find answers on that and more questions.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 4; 17-22
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Cobalt Aluminate Content and Pouring Temperature on Macrostructure, Tensile Strength and Creep Rupture of Inconel 713C Castings
    Autorzy:
    Rakoczy, Ł.
    Grudzień, M.
    Cygan, R.
    Zielińska-Lipiec, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/356407.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    pouring
    investment casting
    lost wax
    superalloy
    creep
    Opis:
    The effect of cobalt aluminate inoculant addition and melt-pouring temperature on the structure and mechanical properties of Ni-based superalloy was studied. The first major move to control the quality of investment cast blades and vanes was the control of grain size. Cobalt aluminate (CoAl2 O4 ) is the most frequently utilized inoculant in the lost-wax casting process of Ni-based superalloys. The inoculant in the prime coat of moulds and pouring temperature play a significant role in grain size control. The finest surface grains were obtained when the internal surface of shell mould was coated with cobalt aluminate and subsequently pouring was at 1480°C. The influence of selected casting parameters and inoculant addition on mechanical properties was investigated on the basis of tensile, creep and hardness testing. The effect of grain refinement on mechanical properties were consistent with established theories. Tests conducted at ambient temperature indicated a beneficial effect of grain refinement both on tensile strength and hardness. In contrast at elevated temperature during creep, the reverse trend was observed.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 3; 1537-1545
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of the Pouring Temperature on the Structure and Mechanical Properties of High-Chromium Cast Iron
    Wpływ temperatury odlewania na strukturę i właściwości mechaniczne żeliwa wysokochromowego
    Autorzy:
    Kopyciński, D.
    Siekaniec, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/382417.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high chromium cast iron
    pouring temperature
    bending strength
    cooling curves
    microstructure
    żeliwo wysokochromowe
    temperatura odlewania
    wytrzymałość
    chłodzenie
    Opis:
    The article presents the results of the influence of pouring temperature on the structure and selected properties of high-chromium cast iron. The study was performed on two different pouring temperatures 1490°C and 1460°C for cast iron of the same chemical composition. Melts were performed in the induction furnace crucible capacity of 15 kg located in the Department of Engineering Alloys and Composites in Foundry Engineering Faculty of AGH. For each temperature cast 2 sets of rollers with dimensions ø30mm, ø20mm, ø15mm x 250mm. During the heats poured cup with installed S type thermocouple to record the cooling curves. Rollers put to the static bending strength test. Samples were cut from the rollers for the test microstructure. The study shown that the pouring temperature has a significant impact on the way of crystallization of high-chromium cast iron and consequently, on the microstructure and mechanical properties. It follows that, by appropriate selection of the pouring temperature can control certain properties of the casting.
    W pracy przedstawiono wyniki badań wpływu temperatury odlewania na strukturę i wybrane właściwości wytrzymałościowe żeliwa wysokochromowego. W ramach badań wykonano dwa wytopy z różną wartością temperatury odlewania 1490 °C i 1460 °C, dla żeliwa o tym samym składzie chemicznym. Wytopy wykonano w piecu indukcyjnym o pojemności tygla 15 kg znajdującym się w Katedrze Inżynierii Stopów i Kompozytów Odlewanych na Wydziale Odlewnictwa AGH. Dla każdej temperatury odlano 2 zestawy wałków o wymiarach ø30 mm, ø20 mm, ø15 mm x 250 mm. Podczas wytopów zalano kubki pomiarowe z termoelementem typu S do rejestracji krzywej krystalizacji i stygnięcia. Wałki poddano statycznej próbie wytrzymałości na zginanie. Następnie z wałków wycięto próbki do badania mikrostruktury. Z przeprowadzonych badań wynika, że temperatura odlewania ma istotny wpływ na sposób krystalizacji odlewu z żeliwa wysokochromowego, a w konsekwencji na mikrostrukturę i właściwości wytrzymałościowe. Wynika z tego, że przez odpowiedni dobór temperatury odlewania można sterować niektórymi właściwościami mechanicznymi odlewu.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 4 spec.; 63-66
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hot Tearing, Parameters, and Mould Types for Observation – Review
    Autorzy:
    Akhyar
    Powiązania:
    https://bibliotekanauki.pl/articles/2127511.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    casting defects
    pouring temperature
    mould temperature
    mould types
    wady odlewnicze
    temperatura wylewu
    temperatura formy
    typ form
    Opis:
    Hot tearing is a casting defect responsible for external and internal cracks on casting products. This irregular undesired formation is often observed during solidification and freezing. The solidification of molten metal also causes thermal contraction and shrinkage, indicating the occurrence of hot tearing when the alloy is restrained by the mould design. The parameters affecting this process include the pouring and mould temperatures, the chemical composition of the alloy, and the mould shape. Also, the factors affecting hot tearing susceptibility include pouring and mould temperatures, the grain refiner, as well as pouring speed. There are many methods of measuring the level of susceptibility to hot tearing, one of which is the thermal contraction evaluation during metal solidification, observed in cast products through several mould types. This paper discusses the hot tearing overview, the effect of pouring temperature, mould temperature, grain refiner, pouring speed on hot tearing, the type of mould, and criterion for hot tear observation.
    Źródło:
    Archives of Foundry Engineering; 2022, 22, 2; 25--49
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A New Technology of TRIAD Cement-Free Castables – Practical Aspects
    Autorzy:
    Cygan, B.
    Dorula, J.
    Jezierski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2079821.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    refractory materials
    new technology
    refractory linings used
    pouring device
    materiały ogniotrwałe
    nowe technologie
    zastosowanie wykładzin ogniotrwałych
    urządzenia do zalewania
    Opis:
    The article presents the new technology of the refractory materials used for the ladles and pouring devices. The aim for solving the majority of the problems that originated from the refractory lining was to develop the group of cement-free TRIAD products by Vesuvius company. The cement-free setting system in the TRIAD products eliminates calcium oxide (CaO) that occurs in low and extra low cement concretes resulting in its higher strength at higher temperatures. The features of the new cement-free castables were described. One of the most unique features of this technology is the porous material structure. Small venting microchannels are formed during the concrete setting process. These micro-channels allow for removing water vapor from the lining without affecting its refractory properties. On the other hand, the diameter of pores is so low that it disallows the penetration of slag and metal into the lining, extends its operating life at the same time facilitates cleaning and removing build-ups. The procedure of the preparation of these materials, as well as the method of building of the lining, were presented. An example of the practical use of these materials in the ductile cast iron foundry was presented, showing the advantages of the new refractory materials over the traditional ones.
    Źródło:
    Archives of Foundry Engineering; 2021, 21, 2; 94-98
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of Casting Shrinkage and Liquid Metal Fluidity of IN-713C Alloy
    Autorzy:
    Binczyk, F.
    Cieśla, M.
    Gradoń, P.
    Findziński, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/380184.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fluidity
    castability
    spiral test
    pouring temperature
    IN713C
    superalloy
    silumin
    płynność
    lejność
    temperatura odlewania
    nadstop
    Opis:
    This paper presents the results of measurements of liquid metal fluidity and linear shrinkage of nickel alloy IN-713C in vacuum induction melting furnace Balzers VSG-2. Because of limited volume of the furnace chamber special models for technological trials were fluidity of hypoeutectic silumin, however in case of nickel superalloy the mould cavity was completely filled in each test because of high required pouring temperature. Positive results were obtained from the modified spiral test for all alloys used in the research. Relationship between the linear shrinkage for the test rod and a specific indicator of contraction defined on a spiral was observed.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 1; 9-12
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The assessment of bell casting producibility based on computer simulation of pouring and solidification
    Autorzy:
    Nadolski, M.
    Zyska, A.
    Konopka, Z.
    Łągiewka, M.
    Karolczyk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/381931.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    bell casting
    artistic casting
    computer simulation
    odlewanie dzwonu
    odlewnictwo artystyczne
    symulacja komputerowa
    Opis:
    The work estimates the possibility of modification of the traditional production method of bell castings taking into account calculations performed by NovaFlow&Solid simulation program. Changes are evaluated with regard to the arrangement of the shrinkage defects in castings, which are of influence on the acoustic and mechanical properties of castings.
    Źródło:
    Archives of Foundry Engineering; 2011, 11, 3 spec.; 141-144
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Metal Pouring Conditions on the Formation of Defects in the Casting
    Autorzy:
    Sowa, L.
    Skrzypczak, T.
    Kwiatoń, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/946863.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    castings defects
    solidification process
    numerical modelling
    molten metal flow
    wady odlewów
    proces krzepnięcia
    modelowanie numeryczne
    metal ciekły
    Opis:
    The mathematical model and numerical simulations of the solidification of a cylindrical casting, which take into account the process of the mould cavity filling by liquid metal and the feeding of the casting through the conical riser during its solidification, are proposed in the paper. The interdependence of thermal and flow phenomena were taken into account because they have an essential influence on solidification process. The effect of the pouring temperature and pouring velocity of the metal on the solidification kinetics of the casting was determined. In order to obtain the casting without shrinkage defects, an appropriate selection of these parameters was tried, which is important for foundry practice. The velocity fields have been obtained from the solution of Navier-Stokes equations and continuity equation, while temperature fields from solving the equation of heat conductivity containing the convection term. In the solidification modelling the changes in thermo-physical parameters as a function of temperature were considered. The finite element method (FEM) was used to solve the problem.
    Źródło:
    Archives of Foundry Engineering; 2020, 20, 2; 31-36
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Fluidity of Al-Si Alloy: Computer Simulation of the Influence of Temperature, Composition, and Pouring Speed
    Autorzy:
    Futáš, P.
    Petrík, J.
    Pribulová, A.
    Blaško, P.
    Palfy, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/351852.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Al-Si
    fluidity
    computer simulation
    regression analysis
    Monte Carlo method
    Opis:
    The purpose of this study is to identify relationships between the values of the fluidity obtained by computer simulation and by an experimental test in the horizontal three-channel mould designed in accordance with the Measurement Systems Analysis. Al-Si alloy was a model material. The factors affecting the fluidity varied in following ranges: Si content 5 wt.% – 12 wt.%, Fe content 0.15 wt.% – 0.3 wt. %, the pouring temperature 605°C-830°C, and the pouring speed 100 g · s-1 – 400 g · s-1. The software NovaFlow&Solid was used for simulations. The statistically significant difference between the value of fluidity calculated by the equation and obtained by experiment was not found. This design simplifies the calculation of the capability of the measurement process of the fluidity with full replacement of experiments by calculation, using regression equation.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 4; 1799-1804
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the State of Stress in Cathode Block of an Aluminium Electrolytic Cell During Formation of Connection with the Steel Pin by Cast Iron Pouring
    Autorzy:
    Piekło, J.
    Maj, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/352715.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    aluminium electrolytic cell
    cathode section
    cast iron
    FEM calculations
    Opis:
    The article presents various aspects of the analysis of the state of stress in carbon block induced by the effect of temperature when a steel pin is connected to the block by pouring a shaped groove with cast iron. Changes in the temperature and state of stress in the block were examined by FEM (Abaqus program). The numerical model was validated by experimental measurements of pin deflection during pouring of the groove with cast iron.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 4; 1869-1874
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Estimation of Mold Filling Ability and Volume Deficit Characteristics of Cast Al-Si Alloys
    Autorzy:
    Santhi, S.
    Vadayar, S.
    Srinivasan, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/382225.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cast Al-Si
    mold filling
    volume deficit
    pouring temperature
    correlation coefficient
    mold coat
    stop Al-Si
    wypełnianie formy
    temperatura wylewu
    współczynnik korelacji
    Opis:
    Production of defect free castings requires good understanding of casting characteristics like mold filling ability and volume deficit characteristic. Pin test piece with cylindrical cores proposed by Engler and Ellerbrok was used to study the mold filling ability. Volume deficit characteristics experiments were conducted using the method designed by Engler. Alloy composition, Mold coat and Pouring temperature were considered as process parameters for the present study and experimental plan has been taken up through design of experiments. The alloy composition is most significant in influencing the mold filling ability, where as pouring temperature is for volume deficit. The Correlation Co-efficient value obtained is -0.98901 indicating strong a negative relation between mold filling ability and volume deficit characteristics. Negative values indicate a relationship between mold filling ability and volume deficit such that as values for mold filling ability increase, for volume deficit decrease.
    Źródło:
    Archives of Foundry Engineering; 2019, 3; 55-65
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Practical Application of the Concept of Separating the Zone of Overheating and Reducing the Stress Level in Cathode Block of an Aluminium Electrolytic Cell During Formation of Connection with the Steel Pin by Cast Iron Pouring
    Autorzy:
    Piekło, J.
    Maj, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/355912.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    aluminium electrolytic cell
    cathode section
    cast iron
    FEM calculations
    Opis:
    The article presents the concept of division of a carbon block into single cathode sections to reduce stresses that occur during thermal shock accompanying the operation of pouring cast iron into a shaped groove in which the current-carrying steel pin is mounted. The temperature field and the state of stress were determined by FEM. Experimental measurements were used to determine the core displacement during pouring operation. The calculations were verified by thermovision and photoelastic method. Based on the temperature field and stress field analysis, a method for the block division into sections has been proposed, resulting in a significant reduction of the stress level.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 1; 67-71
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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