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Title: 過共晶Al-Si合金の複合鋳込み鋳塊の初晶微細化に及ぼす鋳造条件の影響
Other Titles: Effect of Casting Condition on Refinement of Primary Crystals in Hypereutectic Al-Si Alloy Ingots Produced by Duplex Casting Process
Authors: 大参, 達也1 Browse this author →KAKEN DB
工藤, 昌行2 Browse this author
大笹, 憲一3 Browse this author
Authors(alt): Ohmi, Tatsuya1
Kudoh, Masayuki2
Ohsasa, Ken-ichi3
Keywords: casting process
hypereutectic aluminum-silicon alloy
primary silicon
Issue Date: Sep-1992
Publisher: 日本金属学会
Journal Title: 日本金属学会誌
Journal Title(alt): Journal of the Japan Institute of Metals
Volume: 56
Issue: 9
Start Page: 1064
End Page: 1071
Publisher DOI: 10.2320/jinstmet1952.56.9_1064
Abstract: The primary silicon crystals of hypereutectic Al-Si alloy are refined by the Duplex Casting process. In this process, two kinds of alloy melts, i.e. “the first alloy” with a relatively low liquidus temperature and “the second alloy” with a relatively high liquidus temperature, are cast in a mold in sequence at a given time interval. Concerning the refining mechanism, the authors have explained that the second alloy melt is rapidly cooled during mixing with the first alloy which acts as a coolant. In this study, the influences of alloy composition and mold properties on the refinement of the primary silicon crystals in the Duplex Casting process were examined. As a result, it was shown that the grain size of primary silicon varied intricately depending on these conditions. The decantation technique showed that a considerable amount of solidified shell had formed in the first alloy before the pouring of the second alloy melt. Several comparative experiments were carried out in order to examine the effect of heat extraction by the solidified shell, which is to be remelted during the mixing with the second alloy melt, on the refinement of primary silicon crystals. In those experiments, the second alloy melt was mixed with the first alloy which was in the liquid or solid state. As a result, it was proved that the solidified shell contributes greatly to the refinement of the primary silicon crystals through the remarkable enhancement of the cooling capacity of the first alloy. Considering this effect, the influences of alloy composition and mold properties on the primary silicon size can be explained.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 大参 達也

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