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材料工程  2020, Vol. 48 Issue (4): 131-138    DOI: 10.11868/j.issn.1001-4381.2018.001373
  研究论文 本期目录 | 过刊浏览 | 高级检索 |
焊后热处理对AA7204-T4铝合金搅拌摩擦焊接头组织与力学性能的影响
邓运来1,2, 邓舒浩1, 叶凌英1, 林森1, 孙琳3, 吉华2
1. 中南大学 材料科学与工程学院, 长沙 410083;
2. 中南大学 轻合金研究院, 长沙 410083;
3. 中车青岛四方机车车辆股份有限公司, 山东 青岛 266000
Effects of post-weld heat treatment on microstructures and mechanical properties of AA7204-T4 aluminum alloy FSW joint
DENG Yun-lai1,2, DENG Shu-hao1, YE Ling-ying1, LIN Sen1, SUN Lin3, JI Hua2
1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Light Alloy Research Institute, Central South University, Changsha 410083, China;
3. China Railway Rolling Stock Corporation Qingdao Sifang Co., Ltd., Qingdao 266000, Shandong, China
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摘要 采用搅拌摩擦焊对AA7204-T4铝合金板材进行焊接,研究焊后热处理对FSW接头组织与力学性能的影响。结果表明:焊后(AW)态焊核区平均晶粒尺寸和再结晶分数分别为4.7 μm和81.9%,焊后直接人工时效(AA)后二者分别为4.8 μm和82.4%,焊后固溶+人工时效(SAA)后分别为5.9 μm和86.5%,AA态并未对焊核区的晶粒结构产生明显的影响,而SAA态则使其分别提高了25.5%和5.6%。AW态,AA态和SAA态接头抗拉强度分别为296.6,318.2 MPa和357.4 MPa,AA态对接头力学性能提升有限,而SAA态则有效提升接头力学性能,焊接系数达92.0%。焊后固溶淬火导致接头连接界面"S"线处产生微裂纹,接头断裂于此,且伸长率严重降低。
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邓运来
邓舒浩
叶凌英
林森
孙琳
吉华
关键词 AA7204-T4铝合金搅拌摩擦焊焊后热处理组织与性能"S"线    
Abstract:AA7204-T4 aluminum alloy plates were welded by friction stir welding(FSW), and the effect of post-weld heat treatment on the microstructure and mechanical properties of the FSW joints were studied. The results show that the average grain size(AGS) and recrystallization fraction of nugget zone(NZ) are 4.7 μm and 81.9% in as-welded(AW) treatment, 4.8 μm and 82.4% under the post-weld artificial aging(AA) treatment, 5.9 μm and 86.5% under the heat treatment of solid solution followed by artificial aging(SAA), respectively. The grain structure of NZ is not obviously affected by AA treatment, and the AGS and recrystallization fraction of NZ increase by 25.5% and 5.6% under SAA treatment. The ultimate tensile strength(UTS) of the FSW joints are 296.6, 318.2, 357.4 MPa under the heat treatments of AW, AA and SAA, respectively. The improvement of the mechanical properties of FSW joints is limited by AA treatment, while that can be effectively improved by SAA treatment which leads to the welding coefficient reaching 92.0%. Additionally, the microcracks tend to generate on the "S" line under the effect of water quenching after solid solution, which would lead to the fracture location at this zone and the serious decrease of the elongation.
Key wordsAA7204-T4 aluminum alloy    friction stir welding    post-weld heat treatment    microstruc-tures and mechanical property    "S"line
收稿日期: 2018-11-25      出版日期: 2020-04-23
中图分类号:  TG146.2+1  
  TG166.3  
基金资助: 
通讯作者: 叶凌英(1981-),男,副教授,博士,从事高性能铝合金制备与加工技术方面的研究工作,联系地址:湖南省长沙市岳麓区中南大学校本部特冶楼416室(410083),E-mail:lingyingye@csu.edu.cn     E-mail: lingyingye@csu.edu.cn
引用本文:   
邓运来, 邓舒浩, 叶凌英, 林森, 孙琳, 吉华. 焊后热处理对AA7204-T4铝合金搅拌摩擦焊接头组织与力学性能的影响[J]. 材料工程, 2020, 48(4): 131-138.
DENG Yun-lai, DENG Shu-hao, YE Ling-ying, LIN Sen, SUN Lin, JI Hua. Effects of post-weld heat treatment on microstructures and mechanical properties of AA7204-T4 aluminum alloy FSW joint. Journal of Materials Engineering, 2020, 48(4): 131-138.
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http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2018.001373      或      http://jme.biam.ac.cn/CN/Y2020/V48/I4/131
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