Effect of rolling process on fatigue performance of stir zone of AA6061‐T6 doube‐side friction stir welding joint

Stir zone (SZ) of AA6061‐T6 double‐side friction stir welding (DS‐FSW) joint with a thickness of 6 mm had a poor fatigue performance compared with that of base metal (BM). The rolling process was employed to improve the fatigue performance of SZ. The results showed that rolling process increased the...

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Bibliographic Details
Published in:Fatigue & fracture of engineering materials & structures 2021-03, Vol.44 (3), p.748-761
Main Authors: Du, Chengchao, Pan, Qiuhong, Chen, Shujin, Tian, Shuang
Format: Article
Language:English
Subjects:
Aluminum base alloys
Base metal
Crack initiation
Debonding
Dislocation density
fatigue
Fatigue failure
fracture
Fracture mechanics
Friction stir welding
Lamellar structure
rolling
Welded joints
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Summary:Stir zone (SZ) of AA6061‐T6 double‐side friction stir welding (DS‐FSW) joint with a thickness of 6 mm had a poor fatigue performance compared with that of base metal (BM). The rolling process was employed to improve the fatigue performance of SZ. The results showed that rolling process increased the dislocation density in SZ and remarkably enhanced its fatigue performance. The crack initiation played a key role in the fatigue performance of SZ. It relied on the debonding of lamellar structure in SZ. The debonding of lamellar structure depended on the cracking of fine grain layer in lamellar structure.
ISSN:8756-758X
1460-2695
DOI:10.1111/ffe.13391