Effects of Vacuum Rate on Microstructure and Mechanical Properties of Die Casting AZ91D Alloy

Zhang Yubi; Li Dejiang; Hu Bin; Zeng Xiaoqin

doi:10.15980/j.tzzz.2016.01.014

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Effects of Vacuum Rate on Microstructure and Mechanical Properties of Die Casting AZ91D Alloy
Vol. 36, Issue 1, Pages: 52-55(2016)
Published： 2016 ，
DOI： 10.15980/j.tzzz.2016.01.014

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[1]张钰笔,李德江,胡斌,曾小勤.真空度对压铸AZ91D镁合金组织和力学性能的影响[J].特种铸造及有色合金,2016,36(01):52-55.

Zhang Yubi, Li Dejiang, Hu Bin, et al. Effects of Vacuum Rate on Microstructure and Mechanical Properties of Die Casting AZ91D Alloy. [J]. Special Casting & Nonferrous Alloys 36(1):52-55(2016)
[1]张钰笔,李德江,胡斌,曾小勤.真空度对压铸AZ91D镁合金组织和力学性能的影响[J].特种铸造及有色合金,2016,36(01):52-55. DOI： 10.15980/j.tzzz.2016.01.014.

Zhang Yubi, Li Dejiang, Hu Bin, et al. Effects of Vacuum Rate on Microstructure and Mechanical Properties of Die Casting AZ91D Alloy. [J]. Special Casting & Nonferrous Alloys 36(1):52-55(2016) DOI： 10.15980/j.tzzz.2016.01.014.

摘要

在现有真空系统的基础上

通过优化压铸工艺参数以提高模具型腔的真空度

降低压铸件内部的孔隙率

同时提供了一种依据压铸工艺参数计算理论抽真空时间的方法。按照该方法计算的理论时间与实际值的偏差度小于12%。AZ91D镁合金的伸长率随真空度的提升而提高

在17.5kPa真空度下的压铸件伸长率相比普通压铸提高近70%

真空度达到25kPa后继续提升

伸长率的增长速率逐渐减小

在25

0kPa的真空度范围内压铸

具有较高的工业应用价值。

Abstract

Through optimizing vacuum die casting parameters

vacuum rate in mold cavity can be improved and porosity in castings can be decreased.Meanwhile

a method that can calculate theoretical pump-down time according to die casting parameters is presented.The error between theoretical and the actual pump-down time is less than 12%.With increasing in vacuum rate

the elongation of AZ91 Dalloy can be increased.With vacuum rate of 17.5kPa

the elongation of AZ91 Dalloy can increase by 70%compared with those of conventional die casting.After vacuum rate reaching 25 kPa

the increase of elongation is slow down.The range of vacuum rate from 25 kPa to 30 kPa exhibits high industrial application value.