稀土镁合金框架铸造工艺优化研究  

Research on Optimization of Rare-Earth Magnesium Alloy Frame Casting Process

作　　者：潘龙 武丽丽[2] 张益锋 李蒙 高伟宏 毛燚 叶峰 PAN Long;WU Li-li;ZHANG Yi-feng;LI Meng;GAO Wei-hong;MAO Yi;YE Feng(Xinjiang Technology(Jiangsu)Co.,Ltd.,Nantong City,Nantong 226100,Jiangsu,China;Shanghai Aerospace Precision Machinery Research Institute,Shanghai 201600,China)

机构地区：[1]新江科技(江苏)有限公司,江苏南通226100 [2]上海航天精密机械研究所,上海201600

出　　处：《铸造》2024年第8期1165-1170,共6页Foundry

摘　　要：采用ProCAST软件及试验验证的方法对稀土镁合金框架铸造工艺进行优化研究,并结合X射线无损检测、光学显微镜等设备对铸件内部质量、显微组织和力学性能进行表征分析。结果表明:工艺优化前,由于补缩效果不足等原因,铸件内部夹渣、气孔以及疏松等缺陷较多;工艺优化后,通过调节浇注和补缩系统,铸件内部缩松和气孔缺陷基本消失,铸件合格率从68.2%提升到93.5%。显微组织观察表明:铸态显微组织均由等轴的α-Mg基体和沿晶界连续网状分布的第二相组成,工艺优化后铸件晶粒尺寸变得更加细小,平均达到35.99μm。力学性能测试表明:工艺优化后,铸件T6态的室温平均抗拉强度和断后伸长率为265.33 MPa和7.17%,相比于工艺改进前,分别提高23.03%和26.46%。The ProCAST software and test verification method were used to optimize the casting process of rare-earth magnesium alloy frame,and the X-ray non-destructive testing,optical microscopy and other equipments were used to characterize the internal quality,microstructures and mechanical properties of the castings.The results showed that there were many defects such as slag inclusions,blowholes and porosities in castings due to insufficient feeding effect before process optimization.After the process optimization,by adjusting the gating and feeding system,the internal dispersed shrinkage and blowhole defects of castings basically disappeared,and the pass rate of castings increased from 68.2%to 93.5%.The microstructure observation showed that the as-cast microstructure was composed ofα-Mg matrix and the second phase distributed in a continuous network along the grain boundary.The grain sizes of the castings become smaller after the process optimization,reaching 35.99μm averagely.The mechanical property tests showed that after the process optimization,the average tensile strength and post-break elongation of the casting at room temperature in T6 state were 265.33 MPa and 7.17%,compared with the process before improvement,increasing by 23.03%and 26.46%,respectively.

关 键 词：稀土镁合金 铸造工艺 PROCAST 内部质量 显微组织 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]