冷却条件对5E83铝合金搅拌摩擦焊接头组织与性能的影响

doi:10.13251/j.issn.0254-6051.2022.01.022

金属热处理 ›› 2022, Vol. 47 ›› Issue (1): 130-134.DOI: 10.13251/j.issn.0254-6051.2022.01.022

冷却条件对5E83铝合金搅拌摩擦焊接头组织与性能的影响

李昂, 高坤元, 文胜平, 黄晖, 聂祚仁

北京工业大学材料与制造学院新型功能材料教育部重点实验室, 北京 100124

收稿日期:2021-08-24 修回日期:2021-10-18 出版日期:2022-01-25 发布日期:2022-02-18
通讯作者: 高坤元,教授,E-mail:gaokunyuan@bjut.edu.cn
作者简介:李昂(1996—),男,硕士研究生,主要研究方向为铝合金搅拌摩擦焊,E-mail:15722868803@163.com。
基金资助:
国家自然科学基金(51671005);国家重点研发计划(2016YFB0300801);北京市自然科学基金(2202009)

Effect of cooling condition on microstructure and properties of friction stir welded joints of 5E83 aluminum alloy

Li Ang, Gao Kunyuan, Wen Shengping, Huang Hui, Nie Zuoren

Key Laboratory of Advanced Functional Materials, Ministry of Education, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China

Received:2021-08-24 Revised:2021-10-18 Online:2022-01-25 Published:2022-02-18

摘要/Abstract

摘要： 通过光学显微镜、扫描电镜(SEM)、电子背散射衍射(EBSD)、显微硬度试验和拉伸试验,研究了转速为400、800、1200 r/min时,水冷和空冷对5E83铝合金搅拌摩擦焊接头组织与性能的影响。结果表明,与空冷条件相比,水冷条件下搅拌摩擦焊接头产生的飞边减少,洋葱环形成区域缩减、焊核区的硬度明显提高。当转速为800 r/min时,与空冷条件相比,水冷条件下接头的抗拉强度提高,接头效率提高11%,硬度提高11%,同时焊核区的平均晶粒尺寸减小43%,但空冷条件下接头断口的韧窝大而深,塑性较好,水冷条件下的断口韧窝小而浅,塑性下降。

关键词: 搅拌摩擦焊, 5E83铝合金, 冷却条件, 抗拉强度, 平均晶粒尺寸

Abstract: Effect of water-cooling and air-cooling condition on microstructure and properties of the friction stir welded (FSW) joints of 5E83 aluminum alloy at rotation speed of 400, 800, 1200 r/min was investigated by means of optical microscope, scanning electron microscope (SEM), electron backscattered diffraction (EBSD), microhardness test and tensile test. The results show that compared with air-cooling condition, the flash of friction stir welded joints under water-cooling condition and the onion ring formation area reduce, while the hardness of the weld nugget area is significantly improved. When the rotation speed is 800 r/min compared with air-cooling, the tensile strength of the joint under water-cooling is improved, the joint efficiency is increased by 11%, the hardness is increased by 11%, and the average grain size of the weld nugget area is reduced by 43%. However, the fracture dimples of the joint under the air cooling condition are large and deep, and the plasticity is better, while the fracture dimples under the water-cooling condition are small and shallow, and the plasticity decreases.

Key words: friction stir welding, 5E83 aluminum alloy, cooling condition, tensile strength, average grain size

中图分类号:

TG456.9

李昂, 高坤元, 文胜平, 黄晖, 聂祚仁. 冷却条件对5E83铝合金搅拌摩擦焊接头组织与性能的影响[J]. 金属热处理, 2022, 47(1): 130-134.

Li Ang, Gao Kunyuan, Wen Shengping, Huang Hui, Nie Zuoren. Effect of cooling condition on microstructure and properties of friction stir welded joints of 5E83 aluminum alloy[J]. Heat Treatment of Metals, 2022, 47(1): 130-134.

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冷却条件对5E83铝合金搅拌摩擦焊接头组织与性能的影响

Effect of cooling condition on microstructure and properties of friction stir welded joints of 5E83 aluminum alloy

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