Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第19卷    第5期    总第122期    2009年5月

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文章编号:1004-0609(2009)05-0869-05
采用蛇形管通道浇注法制备半固态浆料
杨小容1, 2,毛卫民1,高  冲1

(1. 北京科技大学 铸造研究所,北京 100083;
2. 太原科技大学 材料科学与工程学院,太原 030024
)

摘 要: 采用蛇形管浇注法制备了半固态A356铝合金浆料。结果表明:当浇注温度为660~680 ℃时,采用蛇形管可以制备出半固态A356铝合金组织,且管道内没有出现凝固壳;蛇形管通道的直管段长度对半固态浆料组织有较大影响,即直管段长度变短后,浆料组织变差,且制备合适半固态浆料组织的浇注温度也降低;沿径向浆料组织的形貌分布不同,由心部的球状初生α相向过渡区域的球状和蔷薇状初生α相的混合组织转变,边缘部位为蔷薇状的初生α相组织。

 

关键词: A356铝合金;半固态浆料;蛇形管;初生α

Preparation of semi-solid feedstock by serpentine pipe pouring
YANG Xiao-rong1, 2, MAO Wei-min1, GAO Chong1

1.Foundry Institute, University of Science and Technology Beijing, Beijing 100083, China;
2. School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China

Abstract: The semi-solid feedstock of A356 aluminum alloy was prepared through a serpentine pouring channel. The results indicate that favorable the microstructures of semi-solid A356 aluminum alloy can be generated by a serpentine pouring channel and the solid shell inside the channel can be avoided when the pouring temperature is in the range between 660 ℃ and 680 ℃. The length of the vertical section of the serpentine pouring channel has a significant influence on the microstructures of the feedstock, namely the microstructures of the feedstock become worse when the length of the vertical section is shortened, moreover, the pouring temperature for obtaining the feedstock with suitable microstructure decreases. And some changes occur across the radial microstructures, that is, the spherical grains at the centre transfer to a mixture of spherical and rosette-like grains at the transitional region, then to full rosettes at the edge.

 

Key words: A356 aluminum alloy; semi-solid feedstock; serpentine pouring channel; primary α phase

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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