2019年
Improving fatigue performance of laser-welded 2024-t3 aluminum alloy using dry laser peening
Metals
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- 巻
- 9
- 号
- 11
- 記述言語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.3390/met9111192
? 2019 by the authors. Licensee MDPI, Basel, Switzerland. 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.
- リンク情報
- ID情報
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- DOI : 10.3390/met9111192
- ORCIDのPut Code : 65330234
- SCOPUS ID : 85074654968