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15 October 2015 Fiber laser cutting of AZ31 magnesium alloy: numerical and experimental investigation
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Fiber laser cutting of AZ31B magnesium alloy is considered. A three-dimensional (3D) finite element model (FEM) for simulation of the transient temperature field in laser cutting process is developed. The FEM take into account of the thermal physical parameters change with temperature, the moving heat source, the surface effect element, the reasonable boundary conditions, etc. The temperature evolution, the temperature gradient, the kerf shape and dimensions are simulated. Kerf width are measured using the Olympus optical microscopy and is compared with the predicted value. The microhardness near the kerf is measured by a Vickers microhardness tester. The results show that the maximum temperature gradually increased with the increase of cutting time. The workpiece temperature rise to 135.72°C from the room temperature. The simulated kerf width are in good agreement with measured results. The heat affected zone is not obvious and the microhardness change little perpendicular to laser cutting direction.
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Huafeng Guo, Juli Li, Min He, Xiao Wu, and Tao Sun "Fiber laser cutting of AZ31 magnesium alloy: numerical and experimental investigation", Proc. SPIE 9673, AOPC 2015: Micro/Nano Optical Manufacturing Technologies; and Laser Processing and Rapid Prototyping Techniques, 96730A (15 October 2015);

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