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
李进广 1罗帆 1叶宁 1任永海 1程治 1朱亚君 1郑禄鹏 1吴迪1
作者信息
- 1. 重机宇航材料工程(贵州)有限公司,贵州贵阳 550000
- 折叠
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Rm≥410 MPa、Rp0.2≥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Rm≥410 MPa、Rp0.2≥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.
Abstract
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 Rm ≥410 MPa,Rp0.2 ≥ 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 Rm ≥410 MPa,Rp0.2 ≥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Key words
2A70 aluminum alloy/pre-forging/forging/heat treatment/microstructure/mechanical properties引用本文复制引用
出版年
2024
NETL
NSTL
万方数据