Solidification Characteristics of Semi-solid Al-30Si Alloy by Weak Electromagnetic Stirring with Low Super-heating Pouring

Fan Gang; Zhang Jiatao; Wei Chang

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Solidification Characteristics of Semi-solid Al-30Si Alloy by Weak Electromagnetic Stirring with Low Super-heating Pouring
Issue 4, Pages: 278-280(2008)
Published： 2008 ，
DOI：

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[1]樊刚,张家涛,魏昶.低过热度浇注弱电磁搅拌下半固态Al-30Si合金凝固特性分析[J].特种铸造及有色合金,2008(04):278-280+243.

Fan Gang, Zhang Jiatao, Wei Chang. Solidification Characteristics of Semi-solid Al-30Si Alloy by Weak Electromagnetic Stirring with Low Super-heating Pouring. [J]. Special Casting & Nonferrous Alloys (4):278-280(2008)
[1]樊刚,张家涛,魏昶.低过热度浇注弱电磁搅拌下半固态Al-30Si合金凝固特性分析[J].特种铸造及有色合金,2008(04):278-280+243. DOI：

Fan Gang, Zhang Jiatao, Wei Chang. Solidification Characteristics of Semi-solid Al-30Si Alloy by Weak Electromagnetic Stirring with Low Super-heating Pouring. [J]. Special Casting & Nonferrous Alloys (4):278-280(2008) DOI：

摘要

在凝固理论框架下充分揭示搅拌作用下合金凝固及颗粒形核和生长规律

对深入理解电磁搅拌条件下合金凝固组织形态演化过程具有重要意义。从搅拌对合金熔体运动状态的影响、低过热度浇注、弱电磁搅拌对形核的影响等角度对Al-30Si合金的凝固过程进行了理论分析。分析结果表明

搅拌时液态熔体的切向速度分量占主导地位

轴向和径向分量与切向分量相比很小

可视为零;在低过热度浇注、弱电磁搅拌过程中

低过热度浇注直接导致形核率大幅增加、电磁搅拌间接导致形核率急剧增加。

Abstract

There exists an obvious difference in solidification characteristics of the alloy melt between by weak electromagnetic stirring with low super-heating pouring and by conventional casting.It is important to understand deeply the microstructure evolution of the alloy by analyzing the grain nucleation and growth of the stirred alloy based on solidification theory.The solidification process of semi-solid Al-30Si alloy was described by analyzing effects of weak electromagnetic stirring with low super-heating pouring on the moving of melt and nucleation.The results reveal that the tangential velocity of liquid melt is dominant in stirring process

and the radial and axial velocity can be neglected.The low super-heating pouring can directly increase the nucleation rate in semi-solid alloy and the weak electromagnetic stirring can indirectly increase the nucleation rate.