Artykuły (WM)

Stały URI dla kolekcjihttp://hdl.handle.net/11652/206

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20143

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Tematsearch.filters.applied.operator.equals: search.filters.subject.Innovative casting materials and technologies

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Teraz wyświetlane 1 - 3 z 3
  • Pozycja
    Investigation of an Advanced Cellulose Profile Used for the Manufacture of Gating Systems
    (2014) Zawieja, Zbigniew; Sawicki, Jacek; Gumienny, Grzegorz; Sobczyk-Guzenda, Anna
    The herein paper contains the results of investigations on a new type of cellulose blend used for the manufacture of profiles applied in the process of making gating systems in the foundry industry. A standard cellulose profile was subjected to an experiment. During the experiment the profile was filled with a liquid cast iron and at the same time the temperatures of the liquid metal crystallizing inside the profile were measured as well as the temperature of the outer layer of the profile was controlled. Further, the microstructure of the cast iron, which crystallized out inside the cellulose profile, was analysed and the cellulose, thermally degraded after the experiment, was verified with the use of the chemical analysis method. Moreover, a quality analysis of the original as well as the degraded cellulose profile was run with the use of the FTIR infrared spectroscopy. The presented results revealed that the cellulose blend is aluminium silicate enriched and contains organic binder additives. The cast iron, which crystallized out, tended to have an equilibrium pearlitic structure with the release of graphite and carbides. The generation of disequilibrium ausferrite phases was also observed in the structure.
  • Pozycja
    Effect of Temperature on Ausferritic Nodular Cast Iron Microstructure
    (2014) Gumienny, Grzegorz; Klimek, Leszek
    The work presents the results of the studies of the effect of the temperature on the microstructure of ausferritic nodular cast iron. The ausferrite in the matrix was obtained by way of a specific combination of molybdenum and copper. The cast iron underwent annealing at the temperatures of 520, 550 and 580°C. The work presents the effect of the annealing temperature on the fraction of austenite in the cast iron matrix. The annealed and non-annealed cast iron hardness is given. The work also proves that an increase in the temperature up to 580°C causes a drop in the cast iron hardness.
  • Pozycja
    Analysis of the crystallization of AZ91 alloy by thermal and derivative analysis method intensively cooled in ceramic shell.
    (2014) Rapiejko, Cezary; Pisarek, Bogusław; Czekaj, E.; Pacyniak, Tadeusz
    The work presents the test result of the influence of cooling rate on the microstructure of AZ91 alloy, Vickers micro-hardness and Brinell hardness. Studies cooling and crystallization of AZ91 alloy was cast into the ceramic shells pre-heated to 180 ° C and then air-cooled at ambient temperature or intensively super cooled in the liquid coolant. The TDA method was applied to record and characterize the thermal effect resulting from the phase transformations occurring during the crystallization of AZ91 alloy. The kinetics and dynamics of the thermal processes of crystallization of AZ91 alloy in the ceramic shells were determined. Metallographic tests were performed with the use of an optical microscope. A comparison of these test results with the thermal effect recorded by way of the TDA method was made. Influence of cooling rate of AZ91 on HV0, 01 micro-hardness and Brinell hardness alloy was examined.