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The Influence of Cooling Rate on the Microstructure of Casting Produced by Investment Casting
 Vybíral, Ondřej ; Kaňa, Václav (referee) ; Nekuda, Pavel (advisor)
The presented work provides an insight into the theme of investment casting method and the metallurgy of aluminum alloys, focusing on silumins and their crystallization. In the experimental part, three test castings were made from the AlSi7Mg alloy using this method, with combination of various cross-sections and different cooling rates. SDAS analysis was used to evaluate the influence of cooling rate on the microstructure. The measured values were examined for their dependencies on the cooling rate, casting cross-section, and different sampling locations. The measurements demonstrated that SDAS value is lower in castings with higher cooling rates and smaller cross-sections. At the same time, higher value was measured in samples taken near thermal nodes.
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