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材料研究学报  2019, Vol. 33 Issue (4): 299-305    DOI: 10.11901/1005.3093.2018.625
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氧化膜对6082铝合金搅拌摩擦焊接头疲劳性能的影响
张欣盟1,何广忠1,王贝贝2,3,杨超2,薛鹏2(),倪丁瑞2,马宗义2
1. 中车长春轨道客车股份有限公司 长春 130062
2. 中国科学院金属研究所 沈阳材料科学国家研究中心 沈阳 110016
3. 东北大学材料科学与工程学院 沈阳 110819
Influence of Oxide Film on Fatigue Property of Friction Stir Welded 6082 Al Alloy
Xinmeng ZHANG1,Guangzhong HE1,Beibei WANG2,3,Chao YANG2,Peng XUE2(),Dingrui NI2,Zongyi MA2
1. CRRC Changchun Railway Vehicles Co., Ltd., Changchun 130062, China
2. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
3. School of Materials Science and Engineering, Northeast University, Shenyang 110819, China
引用本文:

张欣盟,何广忠,王贝贝,杨超,薛鹏,倪丁瑞,马宗义. 氧化膜对6082铝合金搅拌摩擦焊接头疲劳性能的影响[J]. 材料研究学报, 2019, 33(4): 299-305.
Xinmeng ZHANG, Guangzhong HE, Beibei WANG, Chao YANG, Peng XUE, Dingrui NI, Zongyi MA. Influence of Oxide Film on Fatigue Property of Friction Stir Welded 6082 Al Alloy[J]. Chinese Journal of Materials Research, 2019, 33(4): 299-305.

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摘要: 

对6 mm厚的6082-T6铝合金进行两种表面处理然后实施搅拌摩擦焊接,研究了对接面氧化膜对接头组织和疲劳性能的影响。结果表明,进行速度为1000 mm/min的高速焊接时,对接面未打磨和打磨的接头焊接质量都良好,接头强度系数达到81%;两种接头的疲劳性能基本相同,疲劳强度均为100 MPa;少数样品在焊核区外断裂,大部分样品在热影响区断裂。与接头相比,两种接头焊核区的疲劳性能有所提高,均为110 MPa,在疲劳测试中裂纹并未沿“S”线萌生和扩展。

关键词 金属材料铝合金搅拌摩擦焊接氧化膜疲劳性能    
Abstract

The polished and as received 6082-T6 Al sheets of 6 mm in thickness were subjected to friction stir welding (FSW) aiming to revealthe effect of surface oxide film on the microstructure and fatigue property of the FSW joint. The results show that high quality FSW joints with a high joint strength coefficient of 81% could be produced by a high welding speed of 1000 mm/min, for the unpolished and polished butt surfaces. Similar fatigue properties were obtained for the two type of FSW joints with the above two surface states, and the fatigue strength was 100 MPa. Most weld joints failed at the heat affected zones, and only a few weld joints failed at the nugget zone (NZ) during fatigue tests. The fatigue strength increased to 110 MPa for the NZ for plates with the above two surface states, and it is revealed during fatigue test that the fatigue cracks did not initiate on and propagate along the so called“S-line”.

Key wordsmetallic materials    Al alloys    friction stir welding    oxide film    fatigue property
收稿日期: 2018-10-22     
ZTFLH:  TG457  
基金资助:国家自然科学基金(51331008)
作者简介: 张欣盟,男,1980年生,高级工程师
MaterialMgSiFeCuMnCrZnTiAl
6082Al0.6-1.20.7-1.30.50.10.4-1.00.250.20.1Bal.
表1  6082铝合金化学成分(%,质量分数)
图1  对接面未打磨和打磨的6082铝合金FSW接头的典型宏观形貌
图2  6082铝合金FSW接头横截面的硬度曲线分布
Samples

Yield strength

/MPa

Ultimate tensile strength/MPa

Elongation

/%

Fatigue strength

/MPa

Base material29332412.9180
Unpolished surfaceJoint1702627.4100
NZ20026926.5110
Polished surfaceJoint1722627.1100
NZ20427223.5110
表2  6082-T6铝合金FSW接头及NZ的拉伸性能和疲劳性能
图3  对接面未打磨和打磨的6082铝合金FSW接头的S-N曲线
图4  对接面未打磨FSW接头疲劳后断于HAZ和断于NZ的横截面断裂形貌
图5  对接面未打磨FSW接头断裂在HAZ的典型断口形貌
图6  对接面未打磨FSW接头断裂在NZ的典型断口形貌
图7  对接面未打磨和打磨的FSW接头NZ的S-N曲线
图8  对接面未打磨FSW接头NZ疲劳后横截面断裂形貌
图9  对接面未打磨FSW接头NZ样品的典型断口形貌
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