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首页 > 过刊浏览>2021年第50卷第11期 >3845-3856. DOI:10.12442/j.issn.1002-185X.20210217
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2A14-T4铝合金T形接头静轴肩搅拌摩擦焊组织结构与力学性能
作者:
作者单位:

1.哈尔滨工业大学 先进焊接与连接国家重点实验室，黑龙江 哈尔滨 150001;2.哈尔滨工业大学(威海) 山东省特种焊接技术重点实验室，山东 威海 264209;3.上海航天设备制造总厂有限公司，上海 200245

基金项目:

国家自然科学基金项目（面上项目，重点项目，重大项目）


Microstructure and Mechanical Properties of 2A14-T4 Aluminum Alloy T-joints Prepared by Stationary Shoulder Friction Stir Welding
Author:
Affiliation:

1.State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China;2.Shandong Provincial Key Laboratory of Special Welding Technology, Harbin Institute of Technology (Weihai), Weihai 264209, China;3.Shanghai Aerospace Equipments Manufacturer Co., Ltd, Shanghai 200245, China

Fund Project:

Key National Defense Basic Research Project (JCKY2017203B066); National Natural Science Foundation of China (51974100); National Science and Technology Major Project (2017ZX04005001)

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    摘要:

    采用静轴肩搅拌摩擦焊接法（SSFSW）在不同的焊接速度下制备了2A14-T4铝合金T形接头。在优化的焊接工艺参数下，可以得到光滑的T形接头焊缝表面。结果表明：焊接熔核区（WNZ）的显微组织为完全动态再结晶产生的细小等轴晶，第2次焊核区（WNZ2）的平均晶粒尺寸最大，焊接重合区（WNOZ）次之，第1次焊核区（WNZ1）的平均晶粒尺寸最小。WNZ的再结晶机制主要是几何动态再结晶，并伴有部分连续动态再结晶。WNZ1和WNZ2织构类型为弱{111}<110>，而WNOZ经过2次搅拌后织构类型为弱{100}<001>。热机械影响区（TMAZ）发生塑性变形，而热影响区（HAZ）只受到焊接热循环作用，不发生塑性变形和晶粒的动态再结晶。WNZ的硬度较高，硬度最低的区域位于靠近TMAZ的HAZ。随着焊接速度的增加，接头抗拉伸强度先增大后减小。底板和加强板的主要断裂形式是脆性/韧性混合断裂。

    Abstract:

    The 2A14-T4 Al-alloy T-joints were prepared by stationary shoulder friction stir welding (SSFSW) at different welding speeds. A smooth T-joint surface was obtained with the optimized welding process parameters. The results show that the microstructure of weld nugget zone (WNZ) consists of fine equiaxed grains caused by full dynamic recrystallization. The average grain size of the second weld nugget zone (WNZ2) is the largest, that of the weld nugget overlap zone (WNOZ) is in the middle, and that of the first weld nugget zone (WNZ1) is the smallest. The recrystallization mechanism in WNZ is mainly the geometric dynamic recrystallization accompanied by partial continuous dynamic recrystallization. The weak {100}<001> texture is formed in the WNOZ after two times of stirring, and the weak {111}<110> texture appears in WNZ1 and WNZ2. The thermo-mechanically-affected zone (TMAZ) undergoes plastic deformation, while the heat-affected zone (HAZ) is only affected by weld thermal cycles. No plastic deformation or the dynamic recrystallization of grains occurs in HAZ. The hardness of WNZ is high, and the zone with the lowest hardness is located in HAZ which is close to TMAZ. With increasing the welding speed, the ultimate tensile strength is firstly increased and then decreased. The mixed brittle/ductile fracture dominates the fracture mode of skin and stiffener plates.

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杨海峰,赵洪运,许欣欣,孙广达,周利,赵慧慧,刘会杰.2A14-T4铝合金T形接头静轴肩搅拌摩擦焊组织结构与力学性能[J].稀有金属材料与工程,2021,50(11):3845~3856.[Yang Haifeng, Zhao Hongyun, Xu Xinxin, Sun Guangda, Zhou Li, Zhao Huihui, Liu Huijie. Microstructure and Mechanical Properties of 2A14-T4 Aluminum Alloy T-joints Prepared by Stationary Shoulder Friction Stir Welding[J]. Rare Metal Materials and Engineering,2021,50(11):3845~3856.]
DOI：10.12442/j. issn.1002-185X.20210217

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  • 收稿日期:2021-03-15
  • 最后修改日期:2021-06-19
  • 录用日期:2021-07-09
  • 在线发布日期: 2021-11-25
  • 出版日期: 2021-11-24

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