Study of microstructural and mechanical properties of weld heat affected zones of 2024-T3 aluminium using Gleeble simulation

被引：8
作者：
Yang, J. G. [2 ]
Sung, S. H. [1 ]
Chen, C. S. [3 ]
Tan, A. H. [1 ]
机构：
[1] Ching Yun Univ, Dept Mech Engn, Jhongli 320, Taiwan
[2] Chun Shan Inst Sci & Technol, Longtan, Taiwan
[3] Lunghwa Univ Sci & Technol, Dept Mech Engn, Gueishan 333, Taiwan
来源：
MATERIALS SCIENCE AND TECHNOLOGY | 2011年 / 27卷 / 01期
关键词：
Microstructural; Mechanical properties; Heat affected zone; 2024-T3 aluminum alloy; Gleeble simulation; FRICTION STIR WELDS; PEAK TEMPERATURES; ALLOY; JOINTS; FATIGUE; PARAMETERS; BEHAVIOR; HARDNESS;
D O I：
10.1179/026708310X12668415533964
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The effect of the microstructural properties on the mechanical properties of welding thermal cycles and post-weld heat treatment of the heat affected zone (HAZ) in 2024-T3 aluminium alloy has been investigated. Gleeble HAZ simulation, differential scanning calorimetry, TEM and tensile test have been utilised to investigate the regions representative of HAZ microstructures. The decay of strength in the weld HAZ is primarily due to the precipitation and coarsening of stable S phases. The welded HAZ in the region at peak temperature of 414 degrees C has the lowest strength after natural aged temper. Post-weld T81 artificial aging (PWAA-T81) heat treatment at 190 degrees C for 12 h has no effect on improving the HAZ strength; the HAZ strength of 2024-T3 alloy obtained by PWAA-T81 treatment is less than that obtained by natural aging, and its lowest strength is shifted to the region of the peak temperature, which is 452 degrees C. Scanning electron microscopy observation reveals that the fracture mode changes from transgranular to intergranular failure when the 2024 specimen is exposed to a thermal cycle up to a peak temperature of 550 degrees C. This is caused by the liquation of grain boundary segregates or formation of a eutectic structure while the specimen is subjected to high temperature thermal cycles during welding, which results in a decrease in the strength and ductility of the grain boundary. It is also shown that the decrease in ductility in this high temperature HAZ cannot be improved using the PWAA-T81 heat treatment.
引用
收藏
页码：357 / 365
页数：9
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