ZL205A合金侧盖壳体铸造工艺研究与产品试制  

Research of Casting Technology and Trial-Production of ZL205A Alloy Side Cover Shell

作　　者：马文龙 杨力[2] 杨小冬 徐远财 罗辉 樊自田[2] 唐锦球 MA Wen-long;YANG Li;YANG Xiao-dong;XU Yuan-cai;LUO Hui;FAN Zi-tian;TANG Jin-qiu(Electromechanical Group Co.of Jiang Lu,Xiangtan 411100,Hunan,China;School of Materials Science and Engineering,Huazhong University of Science and Technology,State Key Laboratory of Material Processing and Die&Mould Technology,Wuhan 030024,Hubei,China)

机构地区：[1]江麓机电集团有限公司,湖南湘潭411100 [2]华中科技大学材料成形与模具技术全国重点实验室,湖北武汉430000

出　　处：《铸造》2024年第6期865-871,共7页Foundry

摘　　要：模拟分析了重力铸造与低压铸造方法下ZL205A合金侧盖壳体铸件的充型、凝固过程及缺陷特征,进行了侧盖壳体铸件试制及性能对比。采用重力铸造时,模拟显示铸件充型速度快,紊流、混流现象严重,凝固速率慢且过程混乱,孔隙率高;样件表面及内部缩松、偏析等缺陷严重,基体组织及晶界中微观缩松与成分偏析交织显现。取样部位平均抗拉强度与伸长率为A区:400 MPa,3.1%,B区:444 MPa,3.4%,铸件为不合格品。采用低压铸造时,模拟显示铸件充型平稳,凝固速率快且自上而下顺序凝固,孔隙率低,样件探伤合格,组织均匀致密且微观缩松和偏析占比显著降低。取样部位平均抗拉强度与伸长率为A区:478 MPa,4.7%,B区:484 MPa,4.9%,铸件合格且性能优异。验证了低压铸造工艺对ZL205A合金侧盖壳体铸件的适应性与优势。In this paper,the filling,solidification process and defect characteristics of ZL205A alloy side cover shell castings under gravity casting and low pressure casting are simulated and analyzed,and the trial production and performance comparison of side cover shell castings are also conducted.When gravity casting is adopted,the simulation shows that the casting filling speed is fast,the phenomenon of turbulence and mixed flow is serious,the solidification rate is slow and the process is chaotic,and the porosity is high.The defects of shrinkage and segregation on the surface and inside of the sample are serious,and the micro-shrinkage and composition segregation are interwoven in the matrix and grain boundaries.The average tensile strength and elongation of the sampling site are 400 MPa,3.1%in zone A and 444 MPa,3.4% in zone B,indicating that the casting is unqualified.When using low pressure casting,the simulation shows that the mold filling is stable,the solidification rate is fast and the porosity is low.The sample is qualified in inspection,the microstructure is uniform and dense,and the proportion of micro-shrinkage and segregation is significantly reduced.The average tensile strength and elongation of the sampling site are 478 MPa,4.7% in zone A and 484 MPa,4.9%in zone B.The casting is qualified and has excellent performance.The adaptability and advantages of low pressure casting process to ZL205A alloy side cover shell casting are verified.

关 键 词：ZL205A 铸造 侧盖壳体 组织结构 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]