研究目的
To adapt a predictive grain structure model originally used for selective electron beam melting (SEBM) to laser beam melting (LBM) and verify the model through experimental data.
研究成果
The grain growth model successfully predicts typical welding microstructures in LBM, with higher line energies leading to increased grain fragmentation. The simulation provides insights into the thermal gradients' role in grain structure formation.
研究不足
The analytical heat model overestimates the width of the melt pool and lacks a nucleation model, which affects the simulation's accuracy in predicting filigreed, needle-like grains.
1：Experimental Design and Method Selection:
The study involves adapting a grain growth model for SEBM to LBM, using an analytical heat source model to calculate heat input and comparing the resulting melt pool geometry with micrographs and high-speed camera shots.
2：Sample Selection and Data Sources:
Single lines with varying welding speeds were molten in a base plate made of polycrystalline IN
3：List of Experimental Equipment and Materials:
7 A Trumpf TruDisk 8001 disk laser, Phantom v1210 high-speed camera, Cavilux HF laser for illumination, KuKa KR30 industrial robot, and argon as shielding gas.
4：Experimental Procedures and Operational Workflow:
The welding optics is fixed on a welding desk with a high-speed camera pointing at the welding pool. The substrate plate is moved by an industrial robot through the beam waist.
5：Data Analysis Methods:
The grain structure is analyzed using Electron Backscatter Diffraction (EBSD) measurements and compared with the predicted microstructure from the simulation.
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