Hard Spots in Die Casting ZL111 Aluminum Alloy Parts

Zhang Xiaoyan; Yu Xingzhi

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Hard Spots in Die Casting ZL111 Aluminum Alloy Parts
Vol. 29, Issue 1, Pages: 30-32(2009)
Published： 2009 ，
DOI：

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[1]张晓妍,于兴芝.ZL111铝合金压铸件硬质点缺陷分析[J].特种铸造及有色合金,2009,29(01):30-32+5.

Zhang Xiaoyan, Yu Xingzhi. Hard Spots in Die Casting ZL111 Aluminum Alloy Parts. [J]. Special Casting & Nonferrous Alloys 29(1):30-32(2009)
[1]张晓妍,于兴芝.ZL111铝合金压铸件硬质点缺陷分析[J].特种铸造及有色合金,2009,29(01):30-32+5. DOI：

Zhang Xiaoyan, Yu Xingzhi. Hard Spots in Die Casting ZL111 Aluminum Alloy Parts. [J]. Special Casting & Nonferrous Alloys 29(1):30-32(2009) DOI：

摘要

采用光学显微镜、电子探针和显微硬度机等试验手段

对ZL111铝合金曲轴箱体的硬质点缺陷进行分析

结果表明曲轴箱体压铸件化学成分严重偏析和超标。组织为不均匀密集分布的白色亮块、不均匀群集的黑色夹杂及浅灰相复合硬质点

分别为压射紊流喷溅卷入的低硬度急冷性硬质点

未熔化的结晶硅、尖晶石MgAl2O4氧化物、AlSiMnFe金属间化合物和金属间化合物复合硬质点。

Abstract

Hard spots in die casting ZL111 aluminum alloy crankcase were observed by OM （optical microscope）

electronic prober and micro-hardness tester

and so on. The results reveal that serious segregation and exceeding-standard of chemical composition in the crankcase can be examined. There exists heterogeneous distribution of white block and gray inclusion as well as low-gray compound hard spots in the microstructure

which coresponding to quenching low hardness spots entrapped by turbulent flow injection

unsmelted Si phase and spinel

MgAl2O4

AlSiMnFe phase as well as compound hard spot of intermetallic compound

respectively.