In this paper, the effects of process parameters on the recycling efficiency of used aluminium beverage cans (UBCs) were investigated. In the experimental studies, separated internal workshop scraps and used aluminium beverage cans are used as charge materials for melting process. Aluminium beverage cans are thin walled parts and produced with high Mg content aluminium alloys. Thus its high oxidation affinity reduces recycling efficiency of the cans. Used can pieces were pressed to obtain briquettes for charging. To increase the recycling efficiency and to optimize the process conditions, preheating, pre-charging, and fluxing were applied. The optimum parameters that provide the maximum recycling efficiency were determined. Chemical analyses and tensile tests were carried out with the resulting as cast samples.
Ductile cast irons have several engineering and manufacturing advantages compared to other cast materials such as steels. These include high damping capacity, wear resistance, to and lower manufacturing cost. The combination of good mechanical properties and casting abilities of ductile cast iron makes its usage successful in structural applications especially in the energy and automotive industries. In this study, the influence of the section thickness on the microstructure and hardness of spheroidal graphite cast iron was investigated with a cascaded model using the full mold casting method. By the high linear correlation coefficient, R2 > 0.90, it was observed that the section thickness directly affected the microstructure and hardness. An increase in the cross-sectional thickness decreases hardness and number of graphite nodules per square millimeters, however, percentage of ferrite was increased.
Birincil alüminyumun üretim maliyetleri ve çevresel etkileri göz önünde bulundurulduğunda ikincil alüminyum öne çıkmaktadır. Ancak içerdiği katışkılar (inklüzyonlar) veya kirlilikler neticesinde ikincil alüminyumun da kritik parçaların üretiminde kullanılmaktan kaçınılmaktadır. Bu çalışmada titreşim altında katılaşma yapılarak bu kirliliklerin titreşimin etkisi ile yüzeye doğru yükseltilmesi ve altta kalan nihai döküm parçasının sağlam şekilde imal edilip edilemeyeceğinin bir ön araştırması yapılmıştır. Aynı zamanda titreşimin katılaşma karakteristiğine de etkisi incelenmiştir. Işık mikroskobu kullanılarak katılaşma esnasında dendritlerin morfolojisi değişimi incelenmiştir. Dendrit kolları arası mesafe ve ikincil dendrit kolları arası mesafeler ölçülmüştür.
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