厚板5083铝合金搅拌摩擦焊接头沿厚度方向组织与力学性能

doi:10.3901/JME.2022.04.094

机械工程学报 ›› 2022, Vol. 58 ›› Issue (4): 94-101.doi: 10.3901/JME.2022.04.094

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厚板5083铝合金搅拌摩擦焊接头沿厚度方向组织与力学性能

方远方^1,2, 张华¹

1. 北京石油化工学院光机电装备技术北京市重点实验室北京 102617;
2. 北京市安全生产工程技术研究院北京 102617

收稿日期:2021-04-07 修回日期:2021-10-05 出版日期:2022-02-20 发布日期:2022-04-30
作者简介:方远方,男,1984年出生,博士研究生。主要研究方向为搅拌摩擦焊。E-mail:fangyuafnang2000@163.com
基金资助:
国家自然科学基金资助项目(51774047)。

Microstructure and Mechanical Properties for Thick Plate 5083 Aluminum Alloy Friction Stir Welding Joint along the Thickness Direction

FANG Yuanfang^1,2, ZHANG Hua¹

1. Beijing Key Laboratory of Opto-Mechatronic Equipment Technology, Beijing Institute of Petrochemical Technology, Beijing 102617;
2. Beijing Academy of Safety Engineering and Technology, Beijing 102617

Received:2021-04-07 Revised:2021-10-05 Online:2022-02-20 Published:2022-04-30

摘要/Abstract

摘要： 目前，国内外对100 mm以上厚度的铝合金搅拌摩擦焊研究较少。针对110 mm厚5083铝合金(o态)板材进行搅拌摩擦焊双面对接试验。焊后试样进行焊缝表面渗透检测、接头力学性能检测，对焊缝横截面、拉伸试样断口进行光学显微镜金相组织观测、扫面电镜观测。结果表明，试验所得焊接接头质量良好，焊缝表面无渗漏，焊缝内部没有孔洞、隧道等缺陷；试样抗拉伸强度平均值达到母材的98%以上，屈服强度平均值达到母材90%以上，伸长率平均值分别达到母材的75.5%和82.4%，抗拉伸强度沿厚度方向呈现先降低后升高的“V”型趋势；焊缝横截面微观组织无缺陷，晶粒分布均匀并有Mg元素富集相析出；接头断裂机制为混合断裂，从焊缝表面至底部，断裂机制由韧性断裂向脆性断裂趋势发展。试验将110 mm厚铝合金搅拌摩擦焊接头沿厚度方向进行性能分析与研究。

关键词: 搅拌摩擦焊, 5083铝合金, 厚板, 力学性能

Abstract: There was little report about more than 100 mm aluminum alloy friction stir welding. The 110 mm 5083 aluminum alloys thick plates were friction stir butt welded by both sides with two welding parameters. Welded specimen were subjected to tensile testing and observed by metallographic and scanning electron microscopy. The results showed that welds with no defects were superior in quality; Tensile strength of joints were up to 98% of parent metal? yield strength account for 90%, elongation account for 75.5% and 82.4%. The tensile strength was shown the “V” trend along thickness direction; Precipitated phase with enrichment of Mg element were observed on cross section of weld joints but no Interface curve; Fracture mechanism transform from ductile fracture to brittle fracture along direction of welding depth. Mechanical properties for 110 mm aluminum alloy friction stir welding joint along thickness direction were studied.

Key words: friction stir weld, 5083 aluminum alloys, thick plate, mechanical property

中图分类号:

TG456

方远方, 张华. 厚板5083铝合金搅拌摩擦焊接头沿厚度方向组织与力学性能[J]. 机械工程学报, 2022, 58(4): 94-101.

FANG Yuanfang, ZHANG Hua. Microstructure and Mechanical Properties for Thick Plate 5083 Aluminum Alloy Friction Stir Welding Joint along the Thickness Direction[J]. Journal of Mechanical Engineering, 2022, 58(4): 94-101.

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厚板5083铝合金搅拌摩擦焊接头沿厚度方向组织与力学性能

Microstructure and Mechanical Properties for Thick Plate 5083 Aluminum Alloy Friction Stir Welding Joint along the Thickness Direction

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