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    Wyświetlanie 1-4 z 4
    Tytuł:
    Influence of Charge Materials on the Metallurgical Quality of Gray Cast Iron
    Autorzy:
    Dwulat, Rafał
    Janerka, Krzysztof
    Grzesiak, K.
    Gałuszka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/27314156.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    gray cast iron
    thermal analysis
    cast iron properties
    charge materials
    cast iron inoculation
    żeliwo szare
    analiza termiczna
    właściwości żeliwa
    Opis:
    The article presents the influence of the percentage share of pig iron and steel scrap on the chemical composition, physicochemical and mechanical properties. Using an induction furnace, 6 melts were carried out with a variable amount of pig iron in the charge from 0 to 50%. For carburizing, a RANCO 9905 carburizer with a carbon content of 99.2% was used. After melting and introducing FeSi75, temperature measurement was carried out and the metal was superheated to 1500°C. The next step was to pour the samples for chemical analysis, DTA (Derivation Thermal Analysis) and strength and hardness from the melting furnace without inoculation. The last step was to carry out the inoculation by introducing 0.3% barium inoculant into the vat and pouring samplers for DTA analysis. The inoculation was carried out solely to determine changes in DTA parameters, mainly Temin, compared to castings without inoculation.
    Źródło:
    Archives of Foundry Engineering; 2023, 23, 2; 66--71
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Various Aspects of Application of Silicon Carbide in the Process of Cast Iron Melting
    Autorzy:
    Janerka, Krzysztof
    Kostrzewski, Łukasz
    Stawarz, Marcin
    Jezierski, Jan
    Szajnar, Jan
    Powiązania:
    https://bibliotekanauki.pl/articles/2134113.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cast iron
    ductile iron
    silicon carbide
    SiC
    cast iron melting
    Opis:
    The article discusses benefits associated with the use of silicon carbide in the process of melting gray cast iron and ductile cast iron in induction electric furnaces. It presents the analysis of the impact of various charge materials and the addition of a variable amount of SiC and FeSi to the fixed charge when melting cast iron of grades GJS 400-15 and GJS 500-7 on mechanical properties and microstructure. Moreover, the article includes an analysis of the efficiency of carburization and the increase in the content of silicon during the application of SiC. The article also presents the results of the study of primary modification using silicon carbide at the minimum temperature of Temin eutectic and Tsol solidus. Based on analysis of the literature, conducted research, and calculations, it was found that the addition of silicon carbide has a beneficial impact on the properties of melted cast iron. The addition of SiC in the charge increases the content of C and Si without increasing the amount of contaminations. The addition of SiC at reduced pig iron presence in the charge decreases production costs, while the use of SiC as an inoculant increases both Temin and Tsol, which is beneficial from the point of view of cast iron nucleation.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 3; 1093--1098
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Successive Stages of the Melting Process on the Nucleation of Ductile Cast Iron
    Autorzy:
    Kołakowski, Jakub
    Brzeżański, Mateusz
    Burdzy, Daniel
    Sobieraj, J.
    Urbanowicz, M.
    Paruch, T.
    Janerka, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/27314118.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    grey cast iron
    ductile cast iron
    inoculation
    DTA
    eutectic temperature
    nucleation
    żeliwo szare
    żeliwo sferoidalne
    inokulacja
    temperatura eutektyczna
    ziarna
    Opis:
    The article discusses issues related to the melting of grey and ductile cast iron in terms of metallurgical quality. The derivative and thermal analysis (DTA) was used to assess this quality. The article presents the results of research carried out in industrial conditions and analysed by the Itaca system. In the paper, the effect of the furnace type, the charge materials and the inoculation process on the parameters characterising the cast iron being melted was analysed. The most important of these are the minimum eutectic temperature (Temin), the liquidus temperature (Tliquidus) and the nucleation rate. The results of the research and calculations are shown in graphs and as dependencies. Some of DTA results were compared to the microstructure analysis results. The article shows that the derivative and thermal analysis is a very effective tool in the assessment of the metallurgical quality of cast iron. It is a very good addition to chemical analysis. Based on the results of the research, it was concluded that a very high correlation exists between the rate of nucleation (DTA) and the number of graphite nuclei (microstructure analysis). Furthermore, it was also found that an improvement in nucleation could be achieved by ensuring a high value of carbon equivalent (CE) and, above all, by conducting the primary and secondary inoculation processes, respectively.
    Źródło:
    Archives of Foundry Engineering; 2023, 23, 1; 61--67
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Importance of TDA Thermal Analysis in an Automated Metallurgical Process
    Autorzy:
    Petrus, Łukasz
    Bulanowski, Andrzej
    Kołakowski, Jakub
    Sobieraj, Jakub
    Paruch, Tomasz
    Urbanowicz, Mariusz
    Brzeżański, Mateusz
    Burdzy, Daniel
    Zych, Jerzy
    Janerka, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/2056035.pdf
    Data publikacji:
    2021
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    ductile iron
    grey cast iron
    thermal derivative analysis
    melting automation
    modification
    żeliwo sferoidalne
    żeliwo szare
    termiczna analiza pochodnych
    automatyzacja topienia
    modyfikacja
    Opis:
    The article presents the results of research and work related to the implementation of the research and development project POIR.01.01.01-00-0120/17 co-financed by the EU, through the NCBR, entitled: Innovative technology using thermal analysis, TDA, of self-feeding manufacturing of high-quality cast iron to produce new generation, enhanced performance casts. In many foundries, thermal derivative analysis (TDA) is used in addition to chemical analysis to evaluate the physical and chemical properties of an alloy while it is still in the melting furnace or ladle and before it is poured into the mold. This fact makes it possible to improve the metallurgical quality of the alloy by introducing alloying additives, carburizers or modifiers into the furnace as part of the pre-modification or primary or secondary modification in the ladle or when pouring into molds. Foundry machinery (modifier dosing systems and spheroidizing station) is very important in these operations. Only the full synergy of modern equipment with modern technology ensures high quality and repeatability of the casting process. The article mainly discusses the obtained parameters of TDA analysis (with the use of the ITACA system) at different stages of melting and how to improve them by using modern and fully automated dosing systems (Itaca OptiDose, ItacaWire and ItacaStream). Special attention was paid to the minimum temperature of the eutectoid. The change of its value after the modification process, its influence on the quality of the melted metal, a very strong correlation with the number of nuclei and the number of graphite precipitations in the casts were shown.
    Źródło:
    Journal of Casting & Materials Engineering; 2021, 5, 4; 89--93
    2543-9901
    Pojawia się w:
    Journal of Casting & Materials Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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