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中南大学学报(自然科学版)

Journal of Central South University

第49卷    第11期    总第291期    2018年11月

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文章编号:1672-7207(2018)11-2677-07
工业纯铝搅拌摩擦焊质量与力学性能
殷琨,黄崇湘,王艳飞,王明赛,黄爱辉

(四川大学 空天科学与工程学院,四川 成都,610065)

摘 要: 采用不同旋转速度/进给速度(ω/v),研究其对AA1050搅拌摩擦焊焊缝的表面形貌、硬度分布、应力-应变曲线和显微组织的影响。研究结果表明:当ω/v分别为800/100,1 000/200和1 400/300时,焊缝区表面质量较好;焊核区硬度高于母材硬度,焊核区平均维氏硬度最高为42.9;焊核区拉伸强度高于母材拉伸强度,极限拉伸强度最高为105 MPa,与母材的拉伸强度相比提升了64%;当旋转速度固定时,随进给速度增加,极限拉伸强度增加,塑性降低;当ω/v为1 400/300时,焊缝具有较好的力学性能和较强加工硬化能力,高焊缝质量对应的点分布在热输入量与焊核区屈服强度的关系曲线凹处周围。

 

关键词: 1050工业纯铝;搅拌摩擦焊;焊缝质量;力学性能

Quality and mechanical property of aluminum joints after friction stir welding
YIN Kun, HUANG Chongxiang, WANG Yanfei, WANG Mingsai, HUANG Aihui

School of Aeronautics and Astronautics, Sichuan University, Chengdu 610065, China

Abstract:Friction stir welding (FSW) joints of AA1050 under various ratios of rotational speed to welding speed (ω/v) were studied. The effects of ω/v on surface appearance, hardness distribution, stress-strain curve and microstructures of the joints were investigated. The results show that fine surface appearance of welded joints can be obtained when ω/v is 800/100, 1 000/200 and 1 400/300. Vickers hardness of stir zone (SZ) is higher than that of base metal (BM) and the highest average Vickers hardness is 42.9. The tensile strength of SZ is also higher than that of BM and the highest ultimate tensile strength (UTS) increase by 64%, up to 105 MPa. At a constant rotation speed, the tensile strength of SZ increases while its ductility decreases with the increase of the welding speed. The welded joint with both good mechanical property and high work-hardening capacity can be obtained when ω/v is 1 400/300. The points corresponding to high welding quality distribute near the inflexion of the curve of yield strength versus heat input.

 

Key words: AA1050; friction stir welding; weld quality; mechanical property

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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