Influence of Oxide Film on Fatigue Property of Friction Stir Welded 6082 Al Alloy

doi:10.11901/1005.3093.2018.625

Chinese Journal of Materials Research

2019, Vol. 33

Issue (4): 299-305 DOI: 10.11901/1005.3093.2018.625

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Influence of Oxide Film on Fatigue Property of Friction Stir Welded 6082 Al Alloy

Xinmeng ZHANG¹,Guangzhong HE¹,Beibei WANG^2,³,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

Cite this article:

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. Chinese Journal of Materials Research, 2019, 33(4): 299-305.

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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 words: metallic materials Al alloys friction stir welding oxide film fatigue property

Received: 22 October 2018

ZTFLH:

TG457

Fund: National Natural Science Foundation of China(51331008)

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	Xinmeng ZHANG
	Guangzhong HE
	Beibei WANG
	Chao YANG
	Peng XUE
	Dingrui NI
	Zongyi MA

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https://www.cjmr.org/EN/10.11901/1005.3093.2018.625 OR https://www.cjmr.org/EN/Y2019/V33/I4/299

Table 1 Chemical composition of 6082Al alloy (mass fraction, %)

Fig.1 Macrostructure of various FSW joints with unpolished butt surface (a) and polished butt surface (b) (NZ—nugget zone, TMAZ—thermo-mechanically affected zone, HAZ—heat-affected zone)

Fig.2 Microhardness profiles of the FSW joints of 6082 Al alloys with different butt surface treatment methods

Table 2 Tensile and fatigue properties of the FSW joint of 6082-T6 Al alloy and the NZ

Fig.3 S-N curves of the FSW joints of 6082 Al alloys with (a) unpolished butt surfaces, (b) polished butt surfaces

Fig.4 Cross-sectional macrostructures of the FSW joints with unpolished butt surfaces (a) failed at HAZ, (b) failed at NZ

Fig.5 Typical morphologies of the fractured surfaces of the FSW joint failed at the HAZ with unpolished butt surface (a) macrostructure, (b) crack initiation zone, (c) crack propagation zone, (d) fast fracture zone

Fig.6 Typical morphologies of the fractured surfaces of the FSW joint failed at the NZ with unpolished butt surface (a) macrostructure, (b) crack initiation zone, (c) crack propagation zone, (d) fast fracture zone

Fig.7 S-N curves of the NZs withunpolished butt surfaces (a) and polished butt surfaces (b)

Fig.8 Cross-sectional macrostructures of NZ after fatigue tests with unpolished butt surface

Fig.9 Typical morphologies of the fractured surfaces of the NZ with unpolished butt surface (a) macrostructure, (b) crack initiation zone, (c) crack propagation zone, (d) fast fracture zone

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