Effect of post-weld heat treatment on 6156 aluminum alloy joint formed by electron beam welding

IF 1.6 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY High Temperature Materials and Processes Pub Date : 2023-01-01 DOI:10.1515/htmp-2022-0253

Shaogang Wang, Junke Xu, Yongpeng Wang

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Abstract

Abstract The 6156 aluminum alloy is welded by electron beam welding, and different post-weld heat treatments (PWHTs) are carried out on the joints. The microstructure, mechanical property, and corrosion behavior of the welded joint before and after PWHT are investigated, respectively. Results show that the fusion zone is composed of columnar crystal and equiaxed grain in as-welded (AW) condition. There are mainly α-Al matrix phase, and some strengthening phases β″(Mg2Si) and Q(Al4CuMg5Si4) in weld metal. After PWHT, the quantity of strengthening phases in weldment is greatly increased, and their distribution is also improved. The tensile strength of welded joint is 65.8% of that of the base metal (BM) in AW condition. After the heat treatment of HT2, the strength coefficient of joint reaches 85.1%. There are many dimples on the tensile fracture surface, and the joint obviously presents the characteristic of ductile fracture. The electrochemical corrosion performance and resistance to intergranular corrosion of weldment in AW condition are higher than that of the BM. However, they are decreased to a certain extent after PWHT. Compared with that of the AW joint, the resistance to intergranular corrosion is slightly decreased after PWHT, and that of the HT2 joint is the best among them.

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焊后热处理对电子束焊接6156铝合金接头的影响

摘要采用电子束焊接6156铝合金，对接头进行了不同的焊后热处理。分别研究了焊后热处理前后焊接接头的微观组织、力学性能和腐蚀行为。结果表明，在焊接状态下，熔合区由柱状晶体和等轴晶粒组成。焊缝金属中主要存在α-Al基体相，以及一些强化相β〃（Mg2Si）和Q（Al4CuMg5Si4）。焊后热处理后，焊件中强化相的数量大大增加，其分布也得到改善。焊接接头在AW状态下的抗拉强度为母材抗拉强度的65.8%。HT2热处理后，接头的强度系数达到85.1%，拉伸断口上有许多凹坑，接头明显呈现韧性断裂特征。焊件在AW条件下的电化学腐蚀性能和抗晶间腐蚀性能均高于BM，但焊后热处理后电化学腐蚀性能有所下降。与AW接头相比，焊后热处理后的抗晶间腐蚀性能略有下降，其中HT2接头的抗晶内腐蚀性能最好。

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来源期刊

High Temperature Materials and Processes 工程技术-材料科学：综合

CiteScore

2.50

自引率

0.00%

发文量

审稿时长

3.9 months

期刊介绍： High Temperature Materials and Processes offers an international publication forum for new ideas, insights and results related to high-temperature materials and processes in science and technology. The journal publishes original research papers and short communications addressing topics at the forefront of high-temperature materials research including processing of various materials at high temperatures. Occasionally, reviews of a specific topic are included. The journal also publishes special issues featuring ongoing research programs as well as symposia of high-temperature materials and processes, and other related research activities. Emphasis is placed on the multi-disciplinary nature of high-temperature materials and processes for various materials in a variety of states. Such a nature of the journal will help readers who wish to become acquainted with related subjects by obtaining information of various aspects of high-temperature materials research. The increasing spread of information on these subjects will also help to shed light on relevant topics of high-temperature materials and processes outside of readers’ own core specialties.