真空增压铸造工艺对ZL114A合金充型能力和力学性能的影响  

Effect of Vacuum Pressurized Casting Process on Filling Ability and Mechanical Properties of ZL114A Alloy

作　　者：陶健全[1] 向林 李晓松 邢志辉 李明 TAO Jian-quan;XIANG Lin;LI Xiao-song;XING Zhi-hui;LI Ming(No.59 Research Institute of China Ordnance Industry,Chongqing 400039,China)

机构地区：[1]中国兵器工业第五九研究所,重庆400039

出　　处：《精密成形工程》2020年第4期166-170,共5页Journal of Netshape Forming Engineering

摘　　要：目的研究不同真空增压铸造工艺参数下ZL114A合金的充型距离、组织性能的变化规律。方法设计了不同厚度的充型距离测试片,采用游标卡尺测试了不同真空度和石膏铸型温度条件下合金的流动性。采用万能拉伸机测试了不同凝固压力条件下单铸试棒的力学性能,采用金相显微镜观察合金的显微组织,采用扫描电子显微镜观察拉伸断口的形貌。结果当真空度从重力状态(0 MPa)提高至-0.08 MPa时,3.0 mm薄片的充型距离从42 mm提升至210 mm。当铸型温度从260℃提高至340℃,3.0 mm薄片的充型距离从95 mm提升至175 mm。凝固压力从重力条件下提升至0.8 MPa,抗拉强度从293 MPa提升至338 MPa,屈服强度从240 MPa提升至278 MPa,断后伸长率从2.0%提升至4.0%。结论提高真空度、铸型温度,可显著提升ZL114A合金的充型能力。提高凝固压力、凝固组织致密,第二相分布均匀,疏松缺陷明显减少,力学性能提高。The paper aims to study the variation law of filling distance and microstructure and properties of ZL114 A alloy under different vacuum pressurized casting process parameters. The filling distance test pieces of different thickness were designed. The fluidity of the alloy under different vacuum and gypsum mold temperature conditions were tested by vernier caliper. The universal tensile machine was used to test the mechanical properties of single-cast test bars under different solidification pressures. The metallographic microscope was used to observe the microstructure of the alloy, and the scanning electron microscope was used to observe the morphology of the tensile fracture. The results showed that when the vacuum degree was increased from the gravity state(0 MPa) to-0.08 MPa, the filling distance of the 3.0 mm sheet was increased from 42 mm to 210 mm. When the mold temperature was increased from 260 ℃ to 340 ℃, the filling distance of the 3.0 mm wafer was increased from 95 mm to 175 mm. The coagulation pressure was increased from gravity to 0.8 MPa;the tensile strength was increased from 293 MPa to 338 MPa;the yield strength was increased from 240 MPa to 278 MPa;and the elongation after fracture was increased from 2.0% to 4.0%. Increasing the vacuum and mold temperature can significantly improve the filling ability of ZL114 A alloy, and increase the solidification pressure. The solidification structure is dense. The second phase is evenly distributed. The loose defects are significantly reduced, and the mechanical property is high.

关 键 词：真空增压 ZL114A 流动性 显微组织 力学性能 

分 类 号：TG249.2[金属学及工艺—铸造]