Study on Microstructure and Fatigue Properties of 6005 Aluminum Alloy Lap Joint

BAI Yishan; YANG Shanglei; ZHU Minqi; FAN Cong

Volume 35 Issue 1

Mar. 2021

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BAI Yishan, YANG Shanglei, ZHU Minqi, FAN Cong. Study on Microstructure and Fatigue Properties of 6005 Aluminum Alloy Lap Joint[J]. Journal of Shanghai University of Engineering Science, 2021, 35(1): 9-14.

Citation:

BAI Yishan, YANG Shanglei, ZHU Minqi, FAN Cong. Study on Microstructure and Fatigue Properties of 6005 Aluminum Alloy Lap Joint[J]. Journal of Shanghai University of Engineering Science, 2021, 35(1): 9-14.

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Study on Microstructure and Fatigue Properties of 6005 Aluminum Alloy Lap Joint

BAI Yishan^a
,,
YANG Shanglei^{a, b
,
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ZHU Minqi^a,
FAN Cong^a

a.
School of Materials Engineering
b.
Shanghai Collaborative Innovation Center for Laser Advanced Manufacturing Technology, Shanghai University of Engineering Science, Shanghai 201620, China

Received Date: 2020-09-25
Publish Date: 2021-03-30

Abstract

Abstract

Metal inert-gas (MIG) welding was used to conduct lap welding experiments on 6005 aluminum alloy. The microstructure and microhardness of the welded joint were observed. The results show that the intergrowth crystal appears in the fusion zone, the equiaxed crystal is dominant in the weld center, and the grain coarsening has occurred in the heat affected zone (HAZ). The Vickers hardness (HV) of the weld zone is 64.5, and that of the base metal zone is 89.6, and the joint appears obvious softening zone. The fatigue strength of the welded joint is only 21.41% of the base material in the fatigue performance test, and the fatigue fracture of the welded joint is a mixed fracture of ductile fracture and dissociative fracture. By analyzing the mechanism of fatigue crack propagation, it is concluded that the crack propagates in a “Z” shape along the 45° direction under the condition of crack tip passivation and loading stress cycle.
- 6005 aluminum alloy,
- microstructure,
- fatigue properties,
- crack growth

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References(12)

References

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