발간논문

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Vol.29, No.2, 165 ~ 172, 1991
Title
Study on the Effect of Rapid Cooling on the Mechanical Properities of Al - 5.2Si - O.4Mg Casting Alloy
심재진Jae Jin Shim, 이상윤Sang Yun Lee
Abstract
To improve the ductility and toughness of Al-5.2%Si-0.4%Mg casting alloy with a reduced amount of Si, the specimens have been prepared by quenching from 450℃ after solidification and the changes in mechanical properties during solution treatment and aging have been investigated. Needle like eutectic Si crystals have been observed to be small and uniform due to rapid quenching and the spheroidization of Si crystals has therefore rapidly occured. When solution treated and aged, the mechanical properties of rapid quenched specimen have been found to be superior to that of slow cooled specimen. In case of aging at 140℃, both elongation and impact strength have been measured to increase by about 30% and solution treatment time can be reduced by rapid quenching after solidification. The Jominy test has been effectively conducted to determine the quenching sensitivity and the air cooled specimen has been found to be more sensitive than the quenched specimen.
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