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材料工程  2017, Vol. 45 Issue (11): 90-95    DOI: 10.11868/j.issn.1001-4381.2015.001071
  研究论文 本期目录 | 过刊浏览 | 高级检索 |
2024-T4铝合金光纤激光填丝焊缝成形与组织性能的相关性
许飞, 陈俐, 何恩光, 郭路云
北京航空制造工程研究所 高能束流加工技术重点实验室, 北京 100024
Correlation of Weld Appearance with Microstructure and Mechanical Properties of 2024-T4 Aluminum Alloy Welded by Fiber Laser with Filler Wire
XU Fei, CHEN Li, HE En-guang, GUO Lu-yun
Key Laboratory of High Energy Beam Processing Technology, Beijing Aeronautical Manufacturing Technology Research Institute, Beijing 100024, China
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摘要 2024-T4铝合金光纤激光填丝焊缝横截面分为钉头形和近X形2种典型形貌,对比分析了该2种形貌的焊缝成形与组织形态、显微硬度和接头拉伸性能的相关性。结果表明:近X形横截面的焊缝在焊接过程中更加平稳,焊接飞溅更少。焊缝区的组织特征为垂直于熔合线相对生长的柱状晶组织和焊缝中心的等轴晶组织。钉头形焊缝中心晶粒的二次枝晶较发达,逐渐形成等轴树枝晶,而近X形焊缝中心晶粒相对细小,呈现为等轴胞状晶。与钉头形横截面的接头相比,近X形横截面的接头焊缝区析出的强化相θ(Al2Cu)相对较多,平均显微硬度值略高,热影响区的软化现象逐渐减弱,接头强度和塑性略低。
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许飞
陈俐
何恩光
郭路云
关键词 2024-T4铝合金光纤激光填丝焊焊缝横截面显微组织拉伸性能    
Abstract:Two typical cross-section of welds, including nail shape and near X shape, are obtained in the process of fiber laser welding 2024-T4 Al alloy with filler wire. The correlations of the two weld appearances and other elements (such as microstructure, microhardness, and joint's tensile properties) were analyzed. The results show that the weld with near X shape cross-section during the welding process is more stable than that with nail shape cross-section, and the welding spatter of the former is smaller than that of the latter. The microstructure of the weld zone is columnar grains and equiaxed grains, the columnar grains are formed near the fusion line and growing along the vertical direction of the fusion line, the equiaxed grains are distributed in the center of the weld zone. The secondary dendrite of the grains in the center of the weld with nail shape cross-section grows better, and gradually forms to equiaxed dendrite, while the grains size of the weld with near X shape cross-section is relatively finer, exhibiting equiaxed cellular grain. Compared with the joint with nail shape cross-section of the weld, the joint with near X shape cross-section of the weld have some different characteristics, the precipitation strengthening phase θ(Al2Cu) content in weld zone of the latter is more than that of the former, the average microhardness value of the weld zone of the latter is higher than that of the former, the softening phenomenon of heat affect zone (HAZ) of the latter is weaker than that of the former, and the joint's tensile strength and plasticity of the latter are lower than that of the former slightly.
Key words2024-T4 Al alloy    fiber laser    welding with filler wire    cross-section of weld    microstructure    tensile property
收稿日期: 2015-08-31      出版日期: 2017-11-18
中图分类号:  TG456.7  
通讯作者: 许飞(1982-),男,高级工程师,硕士,主要从事轻质合金激光焊接方面的研究工作,联系地址:北京朝阳区八里桥北东军庄1号北京航空制造工程研究所104室(100024),E-mail:xufei_0623@163.com     E-mail: xufei_0623@163.com
引用本文:   
许飞, 陈俐, 何恩光, 郭路云. 2024-T4铝合金光纤激光填丝焊缝成形与组织性能的相关性[J]. 材料工程, 2017, 45(11): 90-95.
XU Fei, CHEN Li, HE En-guang, GUO Lu-yun. Correlation of Weld Appearance with Microstructure and Mechanical Properties of 2024-T4 Aluminum Alloy Welded by Fiber Laser with Filler Wire. Journal of Materials Engineering, 2017, 45(11): 90-95.
链接本文:  
http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2015.001071      或      http://jme.biam.ac.cn/CN/Y2017/V45/I11/90
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