研究目的
Investigating the effects of a non-Gaussian laser beam model on temperature profile, bead geometry, and elemental evaporation in the laser powder bed fusion additive manufacturing process compared to a Gaussian beam model and experimental results.
研究成果
The non-Gaussian beam model provides more accurate predictions of temperature profile, bead geometry, and elemental evaporation compared to the Gaussian beam model. The study highlights the importance of accurately modeling the laser beam profile in additive manufacturing processes to predict melt pool dynamics and material properties effectively.
研究不足
The study focuses on Inconel 718 alloy, and the results may not be directly applicable to other materials. The experimental validation is limited to specific laser power and scan speed combinations. The model's accuracy depends on the correct representation of the laser beam profile and material properties.
1：Experimental Design and Method Selection:
The study employs a non-Gaussian laser beam model to simulate the laser-powder interaction, comparing it with a Gaussian beam model and experimental data. The simulation includes thermal modeling combined with fluid dynamic modeling inside the melt pool region.
2：Sample Selection and Data Sources:
Inconel 718 alloy is used for both simulation and experimental validation. Experimental data includes temperature measurements and bead geometry from an EOSINT M 280 machine.
3：List of Experimental Equipment and Materials:
Equipment includes a Yb fiber laser with a wavelength of 1064 nm, COMSOL Multiphysics for simulation, and an MCS 640 thermal imager for temperature measurement.
4：Experimental Procedures and Operational Workflow:
The simulation involves a 3D finite element model for temperature history and a 2D model for bead geometry using the level set method. Experimental validation involves manufacturing specimens with varying laser power and scan speed combinations.
5：Data Analysis Methods:
The analysis includes comparing temperature profiles, melt pool dimensions, and elemental evaporation rates between the non-Gaussian model, Gaussian model, and experimental results.
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