발간논문

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Vol.38, No.4, 529 ~ 534, 2000
Title
Pesearch Paper / Solidification : Microstructure of A356 Semi - Solid Metal Fabricated by Inclination Cooling Plate
김권섭Kwon Sup Kim,임수근Su Gun Lim
Abstract
Semi-solid metal was obtained by semi-solid continuous casting apparatus which consisted of melting furnace, cooling plate and continuous casting part. Primary α size, aspect ratio and hardness of an A356 Al alloy have been investigated. Crystal seeds of the primary α were nucleated on a cooling plate. The seed of primary crystals existing in the molten alloy grew granular grain. The minimum size of primary α at pouring temperature 700℃ were 65 ㎛ in BN coated cooling plate, 53 ㎛ in BN uncoated cooling plate. BN coated cooling plate prevented molten metal from becoming hard. The primary α size increases from 53 ㎛ to 61 ㎛ as casting temperature increase from 630℃ to 650℃. The aspect ratio was increased with increasing primary α size. To investigate the effect of addition of Al-5Ti-1B master alloy is added to A356 Al alloy. The primary α size and aspect ratio are about 42 ㎛ and 1.3 at the content of additional 0.5% grain refiner. The solid fraction of the α phase are about 60∼70%.
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