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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 12    No. 3    June 2002

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Effect of high density pulse electric
 current on solidification structure of
low temperature melt of A356 alloy
HE Shu-xian(何树先),WANG Jun(王  俊),
SUN Bao-de(孙宝德),ZHOU Yao-he(周尧和)

School of Materials Science and Engineering,
Shanghai Jiaotong University, Shanghai 200030, China

Abstract:The effect of high density pulse electric current (HDPEC) on the solidification structure of the low temperaturemelt(LTM) of commercial A356 alloy was investigated. In the experiments, the HDPEC was discharged in the LTM(953K, 903K and 873K). By the control experiments, the results showed that the solidification structure of the LTM of A356 alloy is refined apparently when the HDPEC is discharged in low temperature melt. However, the holding time of melt treated has an adverse effect on the solidification structure. The longer the holding time of the melt treated with HDPEC, the coarser the microstructure. With the same discharge voltage, the lower the temperature of LTM, the more obscure the refinement of solidification structure. Finally, the mechanism of microstructure refining by HDPEC was analyzed.

 

Key words: A356 alloy; low temperature melt; solidification structure; high density pulse electric current

ISSN 1672-7029
CN 43-1423/U

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