真空度对真空压铸镁合金副车架品质的影响  

Effects of Vacuum Level on Appearance and Internal Quality of Die Cast Mg Subframe

作　　者：付彭怀[1] 孙启才 王嘉诚 李德江[1] 王泽忠[2] 赵正江 周力 朱胜利 丁胜长 刘锡林 胡国琦[4] 鲍明东[4] 彭立明[1] Fu Penghuai;Sun Qicai;Wang Jiacheng;Li Dejiang;Wang Zezhong;Zhao Zhengjiang;Zhou Li;Zhu Shengli;Ding Shengchang;Liu Xilin;Hu Guoqi;Bao Mingdong;Peng Liming(National Engineering Research Center of Light Alloy Net Forming,School of Materials Science and Engineering,Shanghai Jiaotong University;Technology Center of Dongfeng Automobile Company;Fengyang Light Alloy Net Forming National Engineering Research Center Co.,Ltd.;School of Materials and Chemical Engineering,Ningbo University of Technology)

机构地区：[1]上海交通大学材料科学与工程学院,轻合金精密成型国家工程研究中心 [2]东风汽车公司技术中心 [3]凤阳爱尔思精密成型有限责任公司 [4]宁波工程学院材料与化工学院

出　　处：《特种铸造及有色合金》2023年第1期88-91,共4页Special Casting & Nonferrous Alloys

基　　金：国家重点研发计划资助项目(2021YFB3701003,2016YFB0301002);国家自然科学基金资助项目(51821001,U21A2048);宁波市科技创新2025重大专项资助项目(2019B10102);广东省重点领域研发计划资助项目(2020B010186001)。

摘　　要：对比研究了真空压铸中低真空(20~30 kPa)与高真空(<5 kPa)对AE44镁合金副车架铸件外观与内部品质的影响。结果表明,与低真空压铸相比,高真空压铸能够显著减少镁合金副车架表面压铸流痕、冷隔以及内部的气孔类缺陷、提高镁合金副车架本体试样的室温塑性和抗拉强度及其致密度,并降低孔隙率,其中铸件本体试样室温伸长率增幅接近50%,平均密度提高了0.51%,孔隙率均值下降了0.50%。压铸中采用高真空(<5 kPa)能够有效地提高镁合金副车架的致密度,从而显著提高铸件的抗拉强度和伸长率。The effects of vacuum level on the appearance and internal quality of die cast AE44 Mg subframe castings were investigated.The results show that compared with low vacuum(20~30 kPa),high vacuum(<5 kPa)can significantly reduce the flow marks/cold shuts on the surface of castings and the gas hole defects in the castings,improve the elongation and tensile strength at room temperature,increase the density and reduce the porosity of the castings.The elongation of the magnesium alloy subframe is increased about 50%,and the average density is improved by 0.51%with the average porosity decreased by 0.50%.High vacuum die casting(vacuum level<5 kPa)can effectively improve the density of Mg subframe castings,which further significantly improves their tensile strength and elongation.

关 键 词：镁合金 副车架 真空压铸 伸长率 密度 

分 类 号：TG249.2[金属学及工艺—铸造] TG146.22[一般工业技术—材料科学与工程] TP311[金属学及工艺—金属材料]