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2A14-T4鋁合金T形接頭靜軸肩攪拌摩擦焊組織結構與力學性能
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1.哈爾濱工業(yè)大學 先進焊接與連接國家重點實驗室，黑龍江 哈爾濱 150001;2.哈爾濱工業(yè)大學(威海) 山東省特種焊接技術重點實驗室，山東 威海 264209;3.上海航天設備制造總廠有限公司，上海 200245

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國家自然科學基金項目（面上項目，重點項目，重大項目）


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:

    采用靜軸肩攪拌摩擦焊接法（SSFSW）在不同的焊接速度下制備了2A14-T4鋁合金T形接頭。在優(yōu)化的焊接工藝參數(shù)下，可以得到光滑的T形接頭焊縫表面。結果表明：焊接熔核區(qū)（WNZ）的顯微組織為完全動態(tài)再結晶產(chǎn)生的細小等軸晶，第2次焊核區(qū)（WNZ2）的平均晶粒尺寸最大，焊接重合區(qū)（WNOZ）次之，第1次焊核區(qū)（WNZ1）的平均晶粒尺寸最小。WNZ的再結晶機制主要是幾何動態(tài)再結晶，并伴有部分連續(xù)動態(tài)再結晶。WNZ1和WNZ2織構類型為弱{111}<110>，而WNOZ經(jīng)過2次攪拌后織構類型為弱{100}<001>。熱機械影響區(qū)（TMAZ）發(fā)生塑性變形，而熱影響區(qū)（HAZ）只受到焊接熱循環(huán)作用，不發(fā)生塑性變形和晶粒的動態(tài)再結晶。WNZ的硬度較高，硬度最低的區(qū)域位于靠近TMAZ的HAZ。隨著焊接速度的增加，接頭抗拉伸強度先增大后減小。底板和加強板的主要斷裂形式是脆性/韌性混合斷裂。

    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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楊海峰,趙洪運,許欣欣,孫廣達,周利,趙慧慧,劉會杰.2A14-T4鋁合金T形接頭靜軸肩攪拌摩擦焊組織結構與力學性能[J].稀有金屬材料與工程,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
  • 錄用日期:2021-07-09
  • 在線發(fā)布日期: 2021-11-25
  • 出版日期: 2021-11-24