预锻对2A70铝合金锻件组织与力学性能的影响  

Effect of pre-forging on microstructure and properties of 2A70 aluminum alloy forgings

作　　者：李进广 罗帆 叶宁 任永海 程治 朱亚君 郑禄鹏 吴迪 LI Jinguang;LUO Fan;YE Ning;REN Yonghai;CHENG Zhi;ZHU Yajun;ZHENG Lupeng;WU Di(Heavy Machinery Aerospace Material Engineering(Guizhou)Co.,Ltd.,Guiyang 550000,China)

机构地区：[1]重机宇航材料工程(贵州)有限公司,贵州贵阳550000

出　　处：《轻合金加工技术》2024年第4期31-35,共5页Light Alloy Fabrication Technology

摘　　要：为了获得高性能的2A70铝合金锻件,对锻造+热处理和预锻+锻造+热处理的2A70铝合金锻件微观组织与力学性能进行研究。用GX51金相显微镜观察2A70铝合金锻件微观组织,用电子万能试验机检测2A70铝合金锻件的力学性能。研究结果表明,锻造+热处理的2A70铝合金锻件性能满足R_(m)≥410 MPa、R_(p)0.2≥350 MPa、显微组织无过烧、显微晶粒度不小于4级的设计要求,但不满足A≥8%的设计要求;预锻+锻造+热处理的2A70铝合金锻件性能满足R_(m)≥410 MPa、R_(p)0.2≥350 MPa、A≥8%、显微组织无过烧、显微晶粒度不小于4级的全部设计要求。2A70铝合金锻造前增加预锻,可以提高其断后伸长率,综合性能优良,符合设计要求。In order to obtain high-performance 2A70 aluminum alloy forgings,the micro-structure and mechanical properties of 2A70 aluminum alloy forgings after forging+heat treatment and pre-forging+forging+heat treatment were studied.The microstructure of 2A70 aluminum alloy forgings after treatment were observed under GX51 metallography mi-croscope and their mechanical properties were tested on electronic universal test machine.The results show that the properties of forging+heat-treated 2A70 aluminum alloy forgings meet the design requirements of R_(m)≥410 MPa,R_(p)0.2≥350 MPa,no burnt microstructure and grain size not less than Lv.4,but does not meet the design requirements of A≥8%.The performance of 2A70 aluminum alloy forgings modified by pre-forging+forging+heat treat-ment meets all design requirements of R_(m)≥410 MPa,R_(p)0.2≥350 MPa,A≥8%,no burnt microstructure and grain size not less than Lv4.The elongation after fracture of 2A70 alumi-num alloy forgings can be improved by adding pre-forging before forging,and the comprehen-sive performance is excellent,which meets the design requirements.

关 键 词：2A70铝合金 预锻 锻造 热处理 微观组织 力学性能 

分 类 号：TG319[金属学及工艺—金属压力加工]