4.5 Article

Improving Fatigue Performance of Laser-Welded 2024-T3 Aluminum Alloy Using Dry Laser Peening

Journal

METALS
Volume 9, Issue 11, Pages -

Publisher

MDPI
DOI: 10.3390/met9111192

Keywords

dry laser peening; femtosecond laser; shock wave; laser welding; 2024 aluminum alloy

Funding

  1. MEXT Quantum Leap Flagship Program (MEXT Q-LEAP) [JPMXS0118068348]
  2. JSPS KAKENHI [JP16H04247, JP16K14417, 19K22061]
  3. ImPACT Program of Council for Science, Technology and Innovation (Cabinet Office, Government of Japan)
  4. Grants-in-Aid for Scientific Research [19K22061] Funding Source: KAKEN

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The purpose of the present study was to verify the effectiveness of dry laser peening (DryLP), which is the peening technique without a sacrificial overlay under atmospheric conditions using femtosecond laser pulses on the mechanical properties such as hardness, residual stress, and fatigue performance of laser-welded 2024 aluminum alloy containing welding defects such as undercuts and blowholes. After DryLP treatment of the laser-welded 2024 aluminum alloy, the softened weld metal recovered to the original hardness of base metal, while residual tensile stress in the weld metal and heat-affected zone changed to compressive stresses. As a result, DryLP treatment improved the fatigue performances of welded specimens with and without the weld reinforcement almost equally. The fatigue life almost doubled at a stress amplitude of 180 MPa and increased by a factor of more than 50 at 120 MPa. DryLP was found to be more effective for improving the fatigue performance of laser-welded aluminum specimens with welding defects at lower stress amplitudes, as stress concentration at the defects did not significantly influence the fatigue performance.

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