焊后热处理对7A04铝合金水下搅拌摩擦焊接接头组织性能的影响

doi:10.11868/j.issn.1001-4381.2016.06.011

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摘要

对7A04铝合金板进行水下搅拌摩擦焊接(Submerged Friction Stir Welding, SFSW),并对焊接接头进行焊后热处理(Post Weld Heat Treatments, PWHT),研究焊后热处理对接头组织性能的影响。结果表明:焊后热处理接头呈现出弥散分布的细小析出相形貌,明显优于SFSW接头呈现出的少量析出相分散分布的特征。与SFSW接头相比,焊后热处理明显改善接头的力学性能。接头焊核区的平均硬度值提高了39.7HV,抗拉强度提高了67MPa,达到母材抗拉强度的96.1%,接头的应变硬化能力增强,拉伸断口呈现微孔聚合和解理混合断裂特征。

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	郝亚鑫
	王文
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	李天麒
	王快社

关键词 ：焊后热处理, 水下搅拌摩擦焊接, 7A04铝合金, 组织性能

Abstract：

7A04 aluminum alloy plate was jointed by submerged friction stir welding(SFSW), and welded joints were treated (Post Weld Heat Treatment, PWHT), and the effect of post weld heat treatment on the microstructure and mechanical properties in SFSW was investigated. The results show that PWHT joints exhibit dispersively distributed fine precipitates phase morphology, are significantly superior than the feature of the small amount of precipitates with dispersed distribution in SFSW joints. Compared with SFSW joints, the mechanical properties of joints are improved significantly by PWHT. The average hardness of the weld joints nugget zone is increased by 39.7HV, and the tensile strength is increased by 67MPa, reaches 96.1% of the base material, strain hardening capacity of the joints is also enhanced, the tensile fracture exhibits mixed fracture feature of microporous polymerization and cleavage.

Key words： post weld heat treatment submerged friction stir welding 7A04 aluminum alloy microstructure and mechanical property

收稿日期: 2015-01-12 出版日期: 2016-06-13

基金资助:国家自然科学基金项目(51404180,51274161,U1360105) ;陕西省工业攻关项目(2013K09-11) ;西安市工业应用技术研发项目(CX12180-1)

通讯作者: 王文 E-mail: 282361936@qq.com

作者简介: 王文(1985-),男,工程师,博士,从事搅拌摩擦焊接及加工研究,联系地址:西安市碑林区雁塔路13号西安建筑科技大学冶金工程学院(710055) ,E-mail:282361936@qq.com

引用本文:

郝亚鑫, 王文, 徐瑞琦, 乔柯, 李天麒, 王快社. 焊后热处理对7A04铝合金水下搅拌摩擦焊接接头组织性能的影响[J]. 材料工程, 2016, 44(6): 70-75.
Ya-xin HAO, Wen WANG, Rui-qi XU, Ke QIAO, Tian-qi LI, Kuai-she WANG. Effect of Post Weld Heat Treatment on Microstructure and Mechanical Properties of Submerged Friction Stir Welded 7A04 Aluminum Alloy. Journal of Materials Engineering, 2016, 44(6): 70-75.

链接本文:

http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2016.06.011 或 http://jme.biam.ac.cn/CN/Y2016/V44/I6/70

Table 1 7A04-T6化学成分(质量分数/%)

Fig.1 SFSW接头横截面宏观形貌

Fig.2 母材和不同焊接接头NZ微观组织

Fig.3 母材和不同焊接接头显微硬度分布

Fig.4 母材和不同焊接接头拉伸性能

Fig.5 不同焊接接头的真应力-真应变曲线

Fig.6 不同焊接接头的加工硬化速率-真应变曲线

Fig.7 不同焊接接头拉伸断口形貌

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