Effects of Casting Speed on Hypereutectic Al-Si Alloy Hollow Billet Fabricated by Direct-chill Casting

Zuo Kesheng; Zhang Haitao; Lin Zhaowei; Qin Ke; Cui Jianzhong

doi:10.15980/j.tzzz.2016.04.021

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Effects of Casting Speed on Hypereutectic Al-Si Alloy Hollow Billet Fabricated by Direct-chill Casting
Vol. 36, Issue 4, Pages: 407-411(2016)
Published： 2016 ，
DOI： 10.15980/j.tzzz.2016.04.021

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[1]左克生,张海涛,林兆伟,秦克,崔建忠.铸造速度对半连续铸造过共晶Al-Si合金管坯的影响[J].特种铸造及有色合金,2016,36(04):407-411.

Zuo Kesheng, Zhang Haitao, Lin Zhaowei, et al. Effects of Casting Speed on Hypereutectic Al-Si Alloy Hollow Billet Fabricated by Direct-chill Casting. [J]. Special Casting & Nonferrous Alloys 36(4):407-411(2016)
[1]左克生,张海涛,林兆伟,秦克,崔建忠.铸造速度对半连续铸造过共晶Al-Si合金管坯的影响[J].特种铸造及有色合金,2016,36(04):407-411. DOI： 10.15980/j.tzzz.2016.04.021.

Zuo Kesheng, Zhang Haitao, Lin Zhaowei, et al. Effects of Casting Speed on Hypereutectic Al-Si Alloy Hollow Billet Fabricated by Direct-chill Casting. [J]. Special Casting & Nonferrous Alloys 36(4):407-411(2016) DOI： 10.15980/j.tzzz.2016.04.021.

摘要

采用半连续铸造制备了尺寸为φ106mm/φ60mm的过共晶Al-Si合金管坯。结合数值模拟和铸造试验

研究了铸造速度对半连续铸造过程和组织的影响。结果表明

随着铸造速度的增加

A390合金管坯中的液穴深度逐渐增加

内壁处重熔层的高度和最高温度逐渐增加。当铸造速度达到240mm/min以上

管坯内壁出现了明显的贫Si层

这是由于熔体的对流作用所致。当铸造速度增加至使Si原子或原子团簇在内侧凝固前沿的附着能力小于冲刷作用时

即在内壁处形成贫Si层。

Abstract

Hypereutectic Al-Si alloy hollow billets with φ106mm/φ60mm in diameter were fabricated by direct-chill casting.Combined numerical simulation with casting experiments

effects of casting speed on casting process and microstructures of the hollow billet were analyzed.The results reveal that with increasing in the casting speed

the sump depth is increased

and the height and the maximum temperature of remelting layer at the inner wall are increased gradually.When the casting speed reaches 240 mm/min

a significant Si-deplete layer is formed at the inner wall

which is attributed to the melt convection at the solidification front.When the casting speed reaches a certain value that the absorption ability of Si atoms or cluster is the lower than that of breaking away at the solidification front

the Si-deplete layer can be formed.