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Browsing by Subject "ADI"

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  • thumbnail.journal.alt
    Item type:Thesis, Access status: Restricted ,
    Analiza wpływu austenityzacji na strukturę i właściwości żeliwa ADI
    (Data obrony: 2020-10-22) Świercz, Iga
    Wydział Odlewnictwa
  • thumbnail.journal.alt
    Item type:Article, Access status: Open Access ,
    Bainite transformation time model optimization for Austempered Ductile Iron with the use of heuristic algorithms
    (Wydawnictwa AGH, 2022) Olejarczyk-Wożeńska, Izabela; Opaliński, Andrzej; Mrzygłód, Barbara; Regulski, Krzysztof; Kurowski, Wojciech
    The paper presents the application of heuristic optimization methods in identifying the parameters of a model for bainite transformation time in ADI (Austempered Ductile Iron). Two algorithms were selected for parameter optimization - Particle Swarm Optimization and Evolutionary Optimization Algorithm. The assumption of the optimization process was to obtain the smallest normalized mean square error (objective function) between the time calculated on the basis of the identified parameters and the time derived from the experiment. As part of the research, an analysis was also made in terms of the effectiveness of selected methods, and the best optimization strategies for the problem to be solved were selected on their basis.
  • thumbnail.journal.alt
    Item type:Thesis, Access status: Restricted ,
    Określenie stopnia akumulacji wybranych zanieczyszczeń w organizmach ryb z rzeki Dunajec oraz w gatunkach ryb hodowlanych.
    (Data obrony: 2019-09-30) Leśniak, Bartłomiej
    Wydział Geologii, Geofizyki i Ochrony Środowiska
  • thumbnail.journal.alt
    Item type:Article, Access status: Open Access ,
    Optimization of isothermal transformation period for austempered ductile iron
    (Wydawnictwa AGH, 2017) Parhad, Prashant; Likhite, Ajay; Bhatt, Jatin; Peshwe, Dilip
    The present paper examines and compares the influence of austempering parameters such as temperature and time on the isothermal transformation and microstructural changes of ductile iron. To identify the compositional and structural changes during an isothermal transformation, a very wide austempering period is chosen at a transformation temperature for the precise determination of the process window. XRD, optical, and scanning electron microscopic techniques are exploited to identify and analyze the changes in the austempered structure, at austempering temperatures of 250°C and 400°C. The various structural parameters like austenite volume fraction (Vg, its carbon content (Cg), lattice parameter, and the average cell size of the ferrite are ascertained. Electron backscattered diffraction (EBSD) analysis is used to identify the carbide precipitation obtained due to the austempering Stage-II reaction. It is noticed that, at the end of the austempering Stage-II reaction, there is a significant reduction in the volume fraction of stabilized austenite and it's carbon content, as the microstructure at this stage not only contains ausferrite but also additional precipitated iron carbides. With an increase in austempering time, the austenite and ferrite volume fraction increase until the austenite becomes stabilized with sufficient carbon. The increase in the lattice parameter of the austenite during austempering corresponds to the rise in carbon content within the austenite. A rise in the austempering temperature leads to a  reduction in the volume fraction of the ferrite and an increase in the stabilized austenite volume fraction. The optimum isothermal transformation period for austempered ductile iron is established, based on the period during which the maximum content of the austenite volume fraction, its carbon, the lattice parameter, and the average cell size of the ferrite are maintained.
  • thumbnail.journal.alt
    Item type:Thesis, Access status: Restricted ,
    Stabilność termiczna struktury żeliwa ADI
    (Data obrony: 2021-02-09) Adaszyński, Piotr
    Wydział Odlewnictwa
  • thumbnail.journal.alt
    Item type:Thesis, Access status: Restricted ,
    Wpływ temperatury oraz czasu ausferrytyzacji na właściwości tribologiczne żeliwa ADI
    (Data obrony: 2016-10-18) Sosiński, Łukasz Sebastian
    Wydział Odlewnictwa
  • thumbnail.journal.alt
    Item type:Thesis, Access status: Restricted ,
    Wyznaczanie wykresu CTPi dla żeliwa sferoidalnego z zastosowaniem wybranych technik aproksymacji
    (Data obrony: 2020-10-26) Górkiewicz, Grzegorz
    Wydział Inżynierii Metali i Informatyki Przemysłowej