One-Step Aging of A357 Alloy Produced by Low Pressure Casting and by Counter Pressure Casting

Li Qiang; Hao Qitang; Jie Wanqi

doi:10.15980/j.tzzz.2012.09.024

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One-Step Aging of A357 Alloy Produced by Low Pressure Casting and by Counter Pressure Casting
Vol. 32, Issue 9, Pages: 824-828(2012)
Published： 2012 ，
DOI： 10.15980/j.tzzz.2012.09.024

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[1]李强,郝启堂,介万奇.低压铸造和差压铸造A357合金人工时效工艺研究[J].特种铸造及有色合金,2012,32(09):824-828.

Li Qiang, Hao Qitang, Jie Wanqi. One-Step Aging of A357 Alloy Produced by Low Pressure Casting and by Counter Pressure Casting. [J]. Special Casting & Nonferrous Alloys 32(9):824-828(2012)
[1]李强,郝启堂,介万奇.低压铸造和差压铸造A357合金人工时效工艺研究[J].特种铸造及有色合金,2012,32(09):824-828. DOI： 10.15980/j.tzzz.2012.09.024.

Li Qiang, Hao Qitang, Jie Wanqi. One-Step Aging of A357 Alloy Produced by Low Pressure Casting and by Counter Pressure Casting. [J]. Special Casting & Nonferrous Alloys 32(9):824-828(2012) DOI： 10.15980/j.tzzz.2012.09.024.

摘要

利用低压铸造和差压铸造两种工艺制取了A357试样

分别在150、165、180和200℃温度下

研究了不同时效温度下硬度随时间的变化趋势。结果表明

铸态下

低压铸造试样和差压铸造试样硬度均值相差不大

但差压铸造试样硬度分布较为均匀。固溶处理后

两者的硬度均下降20%左右。人工时效开始后

铸造工艺对硬度的影响在铸件上显现出来

差压铸造试样的测试结果均高于低压铸造试样;而且

在165和200℃人工时效温度下

低压铸造试样和差压铸造试样硬度随时间的变化趋势有所不同。

Abstract

Effects of different artificial aging at 150

165

180 and 200 ℃ for different time on hardness of A357 alloy specimens produced by low pressure casting and by counter pressure casting were evaluated.The results reveal that the hardness difference between the specimens produced by low pressure casting and by counter pressure casting can be neglected

however

hardness of the specimens produced by counter pressure casting exhibits more uniform distribution.The hardness of the two specimens is decreased by approximately 20% after solid solution.However

after artificial ageing

hardness of the specimens produced by counter pressure castings is higher than that produced by low pressure casting.In addition

the specimens produced by low pressure casting is different from counter pressure castings in hardness change with the time change at 165 ℃ and 200 ℃.