研究目的
To evaluate the effect of localized surface heating using a Yb:?ber laser on the microstructure and the FCG rate on region II of the sigmoidal da/dN 9 DK curve of an aerospace-grade AA6013-T4 aluminum alloy sheet with 1.3 mm thickness.
研究成果
The laser heating lines caused significant microstructural changes in the aluminum alloy, leading to improved fatigue crack growth resistance. The best results were obtained when two laser lines were applied on both lateral surfaces of the specimen, due to the combined effects of microstructural changes and induced compressive residual stresses.
研究不足
The study focused on the AA6013-T4 aluminum alloy and specific laser treatment parameters. The effects of different materials or treatment conditions were not explored.
1：Experimental Design and Method Selection:
The study used a Yb:?ber laser beam defocused to generate a laser spot diameter of 2 mm, with 200 W power and a laser speed of 2 mm/s. Two laser lines were applied over fatigue C(T) specimens in two different forms: on only one and on both lateral specimen surfaces.
2：Sample Selection and Data Sources:
The material used was an aerospace-grade AA6013-T4 aluminum alloy sheet with 1.3 mm thickness.
3：3 mm thickness. List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: IPG Photonics Yb:?ber laser, model YLR-2000, with a 2 kW maximum power; Leica DMRX optical microscope; Tescan Vega3 electron microscope; Tecnai G2-20-SuperTwin FEI 200 kV transmission electron microscope; Rigaku x-ray diffractometer, model Ultima IV; MTS 810.23 servo-hydraulic machine.
4：23 servo-hydraulic machine. Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The laser heating process was applied to the specimens, followed by microstructural analysis, microhardness tests, residual stress measurements, and fatigue crack growth tests.
5：Data Analysis Methods:
The crack growth rate was measured using a crack-opening displacement gage, and the data was analyzed using the secant method according to ASTM E647.
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Yb:?ber laser
YLR-2000
IPG Photonics
Used for localized surface heating treatment
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optical microscope
DMRX
Leica
Used for microstructural analysis
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transmission electron microscope
G2-20-SuperTwin
FEI
Used for microstructural analysis
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x-ray diffractometer
Ultima IV
Rigaku
Used for residual stress measurements
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electron microscope
Vega3
Tescan
Used for microstructural analysis
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servo-hydraulic machine
810.23
MTS
Used for fatigue crack growth tests
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