时效对7A52铝合金激光焊接头组织性能的影响
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摘要
通过硬度试验、拉伸试验、光学显微镜(OM)、扫描电子显微镜(SEM)和EDS分析等手段,研究了6 mm厚7A52铝合金光纤激光焊接头时效前后的组织及性能.结果表明,7A52铝合金光纤激光焊接头的焊缝中心为粗大的等轴晶,热影响区相变再结晶区域存在着细小的等轴晶,热影响区的晶粒相对母材发生明显的长大,焊缝合金强化相主要是T'(Al_2Mg_3Zn_3),焊态接头的抗拉强度为304.6 MPa;当时效工艺为一级时效温度120℃、一级时效时间12 h、二级时效温度160℃、二级时效时间14 h时,焊接接头能够获得相对更好地显微硬度分布,经此时效工艺处理后的焊接接头抗拉强度为326.2 MPa.
Analytical instruments such as hardness test,tensile test,OM,SEM and EDS were employed to analyze microstructures and properties of 6 mm thick 7 A52 aluminum alloy weld joints. The results show that the aging was 120 ℃ + 12 h +160 ℃ + 14 h can get relatively better hardness distribution. The microstructure of weld center consists of larger equiaxed grain,the microstructure in heat affected recrystallization zone consists of fine equiaxed grains,the microstructure in heat-affected area is coarser than that in matrix area,T'( Al2 Mg3 Zn3) is the main strengthening phase in welding seam. The tensile strength of weld joint is 304. 6 MPa. The tensile strength of weld joint is326. 2 MPa after aging.
Analytical instruments such as hardness test,tensile test,OM,SEM and EDS were employed to analyze microstructures and properties of 6 mm thick 7 A52 aluminum alloy weld joints. The results show that the aging was 120 ℃ + 12 h +160 ℃ + 14 h can get relatively better hardness distribution. The microstructure of weld center consists of larger equiaxed grain,the microstructure in heat affected recrystallization zone consists of fine equiaxed grains,the microstructure in heat-affected area is coarser than that in matrix area,T'( Al2 Mg3 Zn3) is the main strengthening phase in welding seam. The tensile strength of weld joint is 304. 6 MPa. The tensile strength of weld joint is326. 2 MPa after aging.
引文
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[2]Shiganov L N,Kholopov A A,Oda E I.Special features of laser welding of aluminium alloys[J].Welding International,2012,26(3):231-235.
[3]Tu J F,Paleocrassas A G.Fatigue crack fusion in thin-sheet aluminum aloys AA7075-T6 using low-speed fiber laser welding[J].Journal of Materials Processing Technology,2011,211(1):95-102.
[4]钱红丽,周琦,陈俐,等.2024铝合金光纤激光焊接头力学性能研究[J].焊接,2013(3):31-33.Qian Hongli,Zhou Qi,Chen Li,et al.Mechanical properties of fiber laser welded 2024 Al alloy joints[J].Welding&Jointing,2013(3):31-33.
[5]张国伟,肖荣诗.5083铝合金厚板超窄间隙光纤激光焊接接头组织与性能[J].中国激光,2014,41(9):102-108.Zhang Guowei,Xiao Rongshi.Microstructure and mechanical properties of 5083 aluminum alloy joint of heavysection by ultranarrow gap fiber laser beam welding[J].Chinese Journal of Lasers,2014,41(9):102-108.
[6]张智慧,董世运,王玉江,等.7A52铝合金光纤激光焊接接头组织与性能研究[J].应用激光,2014,34(6):567-571.Zhang Zhihui,Dong Shiyun,Wang Yujiang,et al.Microstructure and properties of fiber laser welded 7A52 Al alloy joints[J].Applied Laser,2014,34(6):567-571.
[7]钱红丽,周琦,陈俐,等.7A52铝合金光纤激光焊接头组织性能分析[J].焊接,2014(9):49-52.Qian Hongli,Zhou Qi,Chen Li,et al.Microstructure and properties of fiber laser welded 7A52 Al alloy joints[J].Welding&Jointing,2014(9):49-52.
[8]Macchi C E,Somoza A,Dupasquier A,et al.Secondary precipitation in Al-Zn-Mg-(Ag)alloys[J].Acta Materialia,2003,51(17):5151-5158.
[9]张坤,刘志义,郑青春,等.高Zn超高强铝合金的回归再时效处理[J].中南大学学报(自然科学版),2005,36(2):188-192.Zhang Kun,Liu Zhiyi,Zheng Qingchun,et al.Effects of different retrogression and reaging heattreatment on high-zinc superhigh aluminum alloy[J].Journal of Central South University of Technology(Natural Science),2005,36(2):188-192.
[10]尹志民,方家芳,黄继武,等.时效工艺对7A52铝合金晶间腐蚀和剥蚀行为的影响[J].中南大学学报(自然科学版),2007(4):617-622.Yin Zhimin,Fang Jiafang,Huang Jiwu,et al.Effects of aging treatment on intercrystalline corrosion andexfoliation corrosion behavior of 7A52 aluminum alloy[J].Journal of Central South University of Technology(Natural Science),2007(4):617-622.
[11]黄继武,尹志民,聂波,等.双级时效对7A52铝合金组织与性能的影响[J].中南大学学报(自然科学版),2007(6):1045-1049.Huang Jiwu,Yin Zhimin,Nie Bo,et al.Effects of duplex ageing conditions on microstructures andproperties of 7A52 alloy[J].Journal of Central South University(Science and Technology),2007(6):1045-1049.