摘要
本文通过对7075铝合金FSW焊接接头进行固溶处理和时效处理,对比热处理前后焊接接头的力学性能。结果表明:焊接接头抗拉强度从454 MPa提升到486 MPa,延伸率从5.9%提升到6.3%;焊后热处理的焊接接头硬度有整体性提高,热处理前硬度值呈现“W”形分布特征被减弱;热处理后焊接接头断口出现在焊核区,焊接接头前进侧热影响区软化现象得到了改善。
This study carried out solution treatment and aging treatment on 7075 aluminum alloy FSW welded joints,and compared the mechanical properties of welding joints before and after heat treatment.The results showed the ten sile strength of welded joints increased from 454 MPa to 486 MPa,the elongation rose from 5.9%to 6.3%.After heat treatment,the hardness of welded joints achieved overall increase,while the“W”distribution of hardness value was decreased.The fractures of welded joints lied in weld nugget zone,and the strain softening in A-HAZ was improved after heat treatment.
作者
李颖
LI Ying(College of Mechanical and Power Engineering,Shaoyang University,Shaoyang Hunan 422000)
出处
《河南科技》
2020年第4期45-47,共3页
Henan Science and Technology
基金
2016年湖南省教育厅科学研究项目(16C1430)。
关键词
热处理
7075铝合金
焊接接头
力学性能
heat treatment
7075 aluminum alloy
welded joints
mechanical properties
