Effects of Processing Parameters on Grain Size in Die Casting Magnesium Alloy AZ91HP Castings

Fu Zhennan; Cao Yunfeng; Xiong Shoumei

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Effects of Processing Parameters on Grain Size in Die Casting Magnesium Alloy AZ91HP Castings
Issue 7, Pages: 436-438(2006)
Published： 2006 ，
DOI：

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[1]付振南,曹运锋,熊守美.工艺参数对AZ91HP镁合金压铸件晶粒尺寸的影响[J].特种铸造及有色合金,2006(07):436-438+391.

Fu Zhennan, Cao Yunfeng, Xiong Shoumei. Effects of Processing Parameters on Grain Size in Die Casting Magnesium Alloy AZ91HP Castings. [J]. Special Casting & Nonferrous Alloys (7):436-438(2006)
[1]付振南,曹运锋,熊守美.工艺参数对AZ91HP镁合金压铸件晶粒尺寸的影响[J].特种铸造及有色合金,2006(07):436-438+391. DOI：

Fu Zhennan, Cao Yunfeng, Xiong Shoumei. Effects of Processing Parameters on Grain Size in Die Casting Magnesium Alloy AZ91HP Castings. [J]. Special Casting & Nonferrous Alloys (7):436-438(2006) DOI：

摘要

研究了浇注温度、模具温度和内浇道速度对镁合金压铸件抗拉强度和晶粒尺寸的影响规律。结果表明

随浇注温度和内浇道速度的升高

试样的抗拉强度先增大再减小

晶粒尺寸则先减小再增大;当模具温度升高时

试样的抗拉强度随着模具温度升高而增大

晶粒尺寸则随之减小。当压铸工艺参数（浇注温度680℃、模具温度为215℃、内浇道速度为70m/s）适宜时

AZ91HP合金标准拉伸试棒的抗拉强度σb稳定在224.2MPa

密度ρ稳定在1.77g/cm3

晶粒尺寸只有14.4μm。通过线性回归建立了晶粒尺寸和抗拉强度之间的经验关系。

Abstract

Effects of processing parameters

including the pouring temperature

the die temperature

the ingate velocity

on tensile strength and grain size of die casting Mg alloy AZ91 HP have been investigated. The results show that with the increase of the pouring temperature and ingate filling velocity

the tensile strength is increased firstly and then decreased

while grain size is decreased firstly and then increased. However

with increasing in die temperature

tensile strength of the castings is improved and grain size is decreased. The tensile strength of 224.2 MPa and density of 1.77 g/cm

of the samples with grain size of 14.4 μm can be observed at the pouring temperature of 680 ℃ and die temperature of 215 ℃ and ingate velocity of 70 m/s. Finally

an empiric formula between the grain size and tensile strength is established through linear regression.