Porosity Formation in A356 Alloy in Counter-gravity Withdrawal Casting

Zhou Biao; Liao Hengcheng; Pan Ye

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Porosity Formation in A356 Alloy in Counter-gravity Withdrawal Casting
Issue 5, Pages: 388-391(2008)
Published： 2008 ，
DOI：

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[1]周标,廖恒成,潘冶.反重力铸造凝固条件下A356合金中孔洞形成的研究[J].特种铸造及有色合金,2008(05):388-391+327.

Zhou Biao, Liao Hengcheng, Pan Ye. Porosity Formation in A356 Alloy in Counter-gravity Withdrawal Casting. [J]. Special Casting & Nonferrous Alloys (5):388-391(2008)
[1]周标,廖恒成,潘冶.反重力铸造凝固条件下A356合金中孔洞形成的研究[J].特种铸造及有色合金,2008(05):388-391+327. DOI：

Zhou Biao, Liao Hengcheng, Pan Ye. Porosity Formation in A356 Alloy in Counter-gravity Withdrawal Casting. [J]. Special Casting & Nonferrous Alloys (5):388-391(2008) DOI：

摘要

利用自行设计的反重力铸造凝固装置

考察了未进行去气除渣处理的Sr变质A356合金中孔洞形成情况

发现远离结晶器方向

所取横截面大孔数量由几乎没有增多到7个然后减少到1个

单位面积小孔数量由2个/mm2减少到1个/mm2然后增多到4个/mm2

而纵截面孔隙率则由0.3%增大到中部最大2.5%然后减小到0.9%。这种现象是由于远离结晶器方向冷却速度逐渐变小

温度梯度逐渐变小造成的。

Abstract

We have developed a counter-gravity withdrawal casting （CWC） to understand porosity formation in Sr modified A356 alloy without degassing. It is found that with distance far from the crystallizer

the number of large pore with the size larger than 0.5 mm in cross section is firstly increased from 0 to 7 then decreased to 1

while the number of small pore with size less than 0.5 mm is firstly decreased from 2 to 1 then increased to 4

however

the porosity rate in transverse section is increased from 0.3% to 2.5% then decreased to 0.9%

which is attributed to the decrease of temperature gradient with decreasing in cooling rate far from the crystallizer.