Improvement in Fatigue Strength of Friction Stir Welded Aluminum Alloy Plates by Laser Peening

Yuji Sano; Kiyotaka Masaki; Keiichi Hirota

doi:10.4028/www.scientific.net/AMR.891-892.969

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 891-892Improvement in Fatigue Strength of Friction Stir...

Improvement in Fatigue Strength of Friction Stir Welded Aluminum Alloy Plates by Laser Peening

Abstract:

Plane bending fatigue testing was performed to study the fatigue properties of friction stir welded (FSW) 3 mm thick AA6061-T6 aluminum alloy plates. Fatigue cracks propagated with bends and curves on the specimens, showing large deviation from a linear line. This might be reflecting the material flow and microstructure in the weld zone. The fatigue strength of the unwelded base material (BM) was 110 MPa at 10⁷ cycles and FSW deteriorated it to 90 MPa. However, laser peening (LP) restored the degraded fatigue strength up to 120 MPa which is higher than that of the BM.

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Periodical:

Advanced Materials Research (Volumes 891-892)

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969-973

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.891-892.969

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Online since:

March 2014

Authors:

Yuji Sano*, Kiyotaka Masaki, Keiichi Hirota

Keywords:

AA6061 Aluminum Alloy, Aluminium Alloy, Bending Fatigue, Friction Stir Welding (FSW), Laser Shock Processing

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