研究目的
Investigating the thermal behavior and microstructure evolution during laser cladding of AlSi10Mg alloys to improve the understanding and control of the cladding process.
研究成果
The developed FEM model effectively simulates the laser cladding process and predicts the geometry and microstructure of the cladding layers. The asymmetric heat source model accurately describes the thermal behavior during multi-track cladding. The study of temperature gradient and solidification rate provides insights into the microstructure evolution, with higher scanning speeds leading to finer microstructures due to increased cooling rates.
研究不足
The simulation does not account for the fluid flow of the molten pool, volume loss during cladding, and the effect of thermal deformation on the powder bed. The model assumes continuous, equivalent, and isotropic materials for the substrate and powder.
1：Experimental Design and Method Selection:
An improved three-dimensional finite element model was developed to simulate the laser cladding process, incorporating a temperature selection judgment mechanism and a simplified exponential attenuation model for heat source correction.
2：Sample Selection and Data Sources:
AlSi10Mg powders and 5025 aluminum substrate plates were used, with material properties obtained from experiments and theoretical calculations.
3：List of Experimental Equipment and Materials:
A continuous wave 5-kW fiber laser with a wavelength of 1064 nm and a 6-axis KUKA robot were used for the laser cladding experiment.
4：Experimental Procedures and Operational Workflow:
Laser cladding was performed with varying laser powers and scanning speeds, and the resulting cladding layers were analyzed for microstructure and geometry.
5：Data Analysis Methods:
The temperature distribution, temperature gradient (G), solidification growth rate (R), cooling rate (G*R), and G/R were analyzed to predict the morphology and size of the solidification microstructure.
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