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    Wyświetlanie 1-9 z 9
    Tytuł:
    The influence of small amounts of aluminium on the effectiveness of cast iron spheroidization with magnesium
    Autorzy:
    Soiński, M. S.
    Jakubus, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/379819.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metallography
    aluminium
    cast iron
    spheroidization
    graphite precipitates
    metalografia
    żeliwo
    sferoidyzacja
    wydzielenia grafitu
    Opis:
    The influence of aluminium added in amounts of about 1.6%, 2.1%, or 2.8% on the effectiveness of cast iron spheroidization with magnesium was determined. The cast iron was melted and treated with FeSiMg7 master alloy under industrial conditions. The metallographic examinations were performed for the separately cast rods of 20 mm diameter. They included the assessment of the shape of graphite precipitates and of the matrix structure. The results allowed to state that the despheroidizing influence of aluminium (introduced in the above mentioned quantities) is the stronger, the higher is the aluminium content in the alloy. The results of examinations carried out by means of a computer image analyser enabled the quantitative assessment of the considered aluminium addition influence. It was found that the despheroidizing influence of aluminium (up to about 2.8%) yields the crystallization of either the deformed nodular graphite precipitates or vermicular graphite precipitates. None of the examined specimens, however, contained the flake graphite precipitates. The results of examinations confirmed the already known opinion that aluminium widens the range of ferrite crystallization.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 3; 80-83
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal Shock Resistance of Cast Iron with Various Shapes of Graphite Precipitates
    Autorzy:
    Jakubus, A.
    Soiński, M. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/379522.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cast iron
    graphite precipitates
    thermal shock
    żeliwo
    wydzielenia grafitu
    szok termiczny
    Opis:
    The influence of a shape of graphite precipitates in cast iron on the thermal shock resistance of the alloy was initially determined. Investigations included the nodular cast iron and the vermicular one, as well as the cast iron containing flake graphite. The thermal shock resistance was examined at a special laboratory stand which allowed for multiple heating and cooling of specimens within the presumed temperature range. The specimens were inductively heated and then cooled in water of constant temperature of about 30°C. There were used flat specimens 70 mm long, 5 mm thick in the middle part, and tapering like a wedge over a distance of 15 mm towards both ends. The total length of cracks generated on the test surfaces of the wedge-shaped parts of specimens was measured as a characteristic value inversely proportional to the thermal shock resistance of a material. The specimens heated up to 500°C were subjected to 2000 test cycles of alternate heating and cooling, while the specimens heated up to 600°C underwent 1000 such cycles. It was found that as the heating temperature rose within the 500-600°C range, the thermal shock resistance decreased for all examined types of cast iron. The research study proved that the nodular cast iron exhibited the best thermal shock resistance, the vermicular cast iron got somewhat lower results, while the lowest thermal shock resistance was exhibited by grey cast iron containing flake graphite.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 2; 121-124
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Initial Assessment of Abrasive Wear Resistance of Austempered Cast Iron with Vermicular Graphite
    Wstępna ocena odporności na ścieranie żeliwa z grafitem wermikularnym hartowanego izotermicznie
    Autorzy:
    Soiński, M. S.
    Jakubus, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/351080.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cast iron
    vermicular graphite
    austempering
    abrasive wear resistance
    żeliwo
    grafit wermikularny
    odporność na ścieranie
    hartowanie izotermiczne
    Opis:
    The work compares the abrasive wear resistance of cast iron containing vermicular graphite, measured in the as-cast state and after austempering carried out at 290°C, 340°C, or 390°C. Theexaminations were performed by means of the T-01M tribological tester using the pin-on-disc configuration. Specimens used for examinations were taken from the end tabs of the tensile specimens, these being cut out of the test walls of the double-leg keel block test castings. Examinations proved that the austempering process increases the abrasive wear resistance of vermicular cast iron by several times as compared with the as-cast material. A tendency for a slight decrease in abrasive wear with an increase in austempering temperature can be stated. The coefficient of friction took a little higher values for cast iron after thermal treatment than for the as-cast material. The work was completed with roughness examination by means of electron scanning microscopy.
    W pracy porównano odporność na ścieranie żeliwa z grafitem wermikularnym w stanie lanym oraz po hartowaniu izotermicznym przeprowadzonym w temperaturach 290°C, 340°C i 390°C. Badaniaodporności na ścieranie przeprowadzono przy użyciu zestawu trybologicznego T-01M typu trzpień-tarcza. Próbki do badań pochodziły z próbek wytrzymałościowych wyciętych ze ścianek badawczych wlewków próbnych w kształcie odwróconej litery „U”. Badania wykazały, że poddanie żeliwa wermikularnego hartowaniu izotermicznemu prowadzi do kilkukrotnego wzrostu odporności tworzywa na ścieranie w porównaniu z żeliwem w stanie lanym. Zaobserwowano niewielki spadek zużycia wraz ze wzrostem temperatury hartowania. Współczynnik tarcia dla żeliwa po obróbce cieplej przybrał nieco większe wartości aniżeli w przypadku żeliwa w stanie lanym. W ramach pracy wykonano także badania chropowatości z wykorzystaniem mikroskopii skaningowej.
    Źródło:
    Archives of Metallurgy and Materials; 2014, 59, 3; 1073-1076
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Aluminium on the Spheroidization of Cast Iron Assessed on the Basis of Wedge Test
    Autorzy:
    Soiński, M. S.
    Jakubus, A.
    Stradomski, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/383125.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metallography
    cast iron
    aluminium
    spheroidization
    graphite precipitates
    metalografia
    żeliwo
    sferoidyzacja
    wydzielenia grafitu
    Opis:
    The paper discusses the influence of aluminium in quantities from about 1.9% to about 4.7% on both the alloy matrix and the shape of graphite precipitates in cast iron spheroidized with cerium mixture (added in the quantity of 0.11%) and inoculated with ferrosilicon (1.29%). The metallographic examinations were carried out for specimens cut out of the wedge test castings (22 mm base width, 120 mm height, 180 mm length) halfway along their length. It was found that the highest susceptibility to graphitization exhibits the cast iron containing about 2.8% Al. The alloy matrices were classified and the degrees of graphite spheroidization were determined. Microscopic observations were carried out along the wedge test casting height at several places, the first distant by 20 mm from the specimen apex, the next ones every 20 mm farther. Precipitates of nodular and vermicular graphite were found in the cast iron structure. The results of examination allow to state that cast iron spheroidized in the way described here is characterised by the degree of spheroidization which increase with an increase in aluminium content within the examined range.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 1 spec.; 163-168
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Assessment of Resistance to Thermal Fatigue and Thermal Shock of Cast Iron Used for Glass Moulds
    Autorzy:
    Stradomski, G.
    Gzik, S.
    Jakubus, A.
    Nadolski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/379733.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thermal fatigue
    high temperature parameters
    cracking
    cast iron
    production of glass
    zmęczenie termiczne
    parametry wysokiej temperatury
    pękanie
    żeliwo
    produkcja szkła
    Opis:
    Constantly developing production process and high requirements concerning the quality of glass determine the need for continuous improvement of tools and equipment needed for its production. Such tools like forms, most often made of cast-iron, are characterized by thick wall thickness compared to their overall dimensions and work in difficult conditions such as heating of the surface layer, increase of thermal stresses resulting from the temperature gradient on the wall thickness, occurrence of thermal shock effect, resulting from cyclically changing temperatures during filling and emptying of the mould. There is no best and universal method for assessing how samples subjected to cyclic temperature changes behave. Research on thermal fatigue is a difficult issue, mainly due to the instability of this parameter, which depends on many factors, such as the temperature gradient in which the element works, the type of treatment and the chemical composition of the material. Important parameters for these materials are at high temperature resistance to thermal shock and thermal fatigue what will be presented in this paper.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 3; 173-178
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Aluminium on Graphitization of Cast Iron Treated with Cerium Mixture
    Autorzy:
    Soiński, M. S.
    Jakubus, A.
    Kordas, P.
    Skurka, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/380446.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cast iron
    aluminium
    graphitization
    cerium mixture
    żeliwo
    grafityzacja
    cer
    Opis:
    The work determined the influence of aluminium in the amount from about 0.6% to about 8% on graphitization of cast iron with relatively high silicon content (3.4%-3.9%) and low manganese content (about 0.1%). The cast iron was spheroidized with cerium mixture and graphitized with ferrosilicon. It was found that the degree of graphitization increases with an increase in aluminium content in cast iron up to 2.8%, then decreases. Nodular and vermicular graphite precipitates were found after the applied treatment in cast iron containing aluminium in the amount from about 1.9% to about 8%. The Fe3AlCx carbides, increasing brittleness and deteriorating the machinability of cast iron, were not found in cast iron containing up to about 6.8% Al. These carbides were revealed only in cast iron containing about 8% Al.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 2; 95-100
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure of Foundry Production in the World and in Poland over the 1974-2013 Period
    Autorzy:
    Soiński, M. S.
    Skurka, K.
    Jakubus, A.
    Kordas, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/381277.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    foundry production
    cast iron
    cast steel
    aluminium alloy
    nonferrous alloy
    produkcja odlewnicza
    żeliwo
    staliwo
    stop aluminium
    stop nieżelazny
    Opis:
    The paper presents data illustrating the total production of castings in the world and in Poland over the 1974-2013 period. The fractions of basic casting alloys in the total amount of material used for the production of metal castings during the considered period of time were found. It was noticed that the fraction of grey cast iron castings in the total amount of the produced castings decreased significantly over the past 40 years, both on a global scale (from about 65-75% to about 45%) and in Poland (from about 75-80% to about 45-55%). The fraction of SG iron increased considerably, up to about 25% in the world, and up to about 12-16% in Poland. The fraction of malleable became almost negligible (about 1%). The fraction of cast steel took different course in Poland and in the world: it stabilised on a global scale at about 10% in recent years, but dropped down to the level of about 4-7% in Poland. The use of aluminium alloys for the production of casting grew dynamically; their fraction in the total production of casting rose from somewhat less than 4% to almost 15% on a global scale. As far as Poland is considered, this growth was ever more intensive: from about 6-8% to about 25-30% in the 1989-2013 period (the detailed data for the previous period of time are lacking).
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 2 spec.; 69-76
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Production of Castings in the World and in Selected Countries from 1999 to 2013
    Autorzy:
    Soiński, M. S.
    Jakubus, A.
    Kordas, P.
    Skurka, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/383237.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    production of castings
    cast iron
    cast steel
    non-ferrous alloys
    produkcja odlewów
    żeliwo
    staliwo
    stopy metali nieżelaznych
    Opis:
    The paper compares the foundry production in years 1999-2013 on a world scale, in countries counted among the leading producers of castings, and in Poland. Various types of foundry alloys were taken into account. It was found that the position of China – the leader in the world production of castings – was not changed over many years, however China's share in the total production of casting has stabilised at the level of 42-44% during the recent five years. In the analysed period of time Poland increased the share in the world production of castings from 1.07% to about 1.23%, so that Polish production of castings was almost doubled. There is a tendency on the world scale that the grey cast iron fraction in the total production of castings decreases, while an increase occurs as far as spheroidal graphite cast iron, cast steel, and aluminium alloy castings are concerned.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 1 spec.; 103-110
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characteristics of Graphite Precipitates in Aluminium Cast Iron Treated with Cerium Mixture
    Autorzy:
    Soiński, M. S.
    Jakubus, A.
    Kordas, P.
    Skurka, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/381207.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metallography
    cast iron
    aluminium
    spheroidization
    graphite precipitates
    metalografia
    żeliwo
    sferoidyzacja
    wydzielenia grafitu
    Opis:
    The work determined the influence of aluminium in the amount from about 1% to about 7% on the graphite precipitates in cast iron with relatively high silicon content (3.4% to 3.90%) and low manganese content (about 0.1%). The cast iron was spheroidized with cerium mixture and graphitized with ferrosilicon. The performed treatment resulted in occurring of compact graphite precipitates, mainly nodular and vermicular, of various size. The following parameters were determined: the area percentage occupied by graphite, perimeters of graphite precipitates per unit area, and the number of graphite precipitates per unit area. The examinations were performed by means of computer image analyser, taking into account four classes of shape factor. It was found that as the aluminium content in cast iron increases from about 1.1% to about 3.4%, the number of graphite precipitates rises from about 700 to about 1000 per square mm. For higher Al content (4.2% to 6.8%) this number falls within the range of 1300 – 1500 precipitates/mm2. The degree of cast iron spheroidization increases with an increase in aluminium content within the examined range, though when Al content exceeds about 2.8%, the area occupied by graphite decreases. The average size of graphite precipitates is equal to 11-15 μm in cast iron containing aluminium in the quantity from about 1.1% to about 3.4%, and for higher Al content it decreases to about 6 μm.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 1; 93-98
    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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