研究目的
Investigating the entire process chain of selective laser melting of Ti-6Al-4V, including temperature profile, melt pool size and shape, grain morphology, and microstructural evolution during heat treatment.
研究成果
The developed thermo-fluid dynamic model effectively simulates the temperature and fluid motion during SLM, showing good agreement with literature. The model successfully predicts grain morphology and microstructural evolution, with simulations aligning well with experimental results. Future research will focus on more complex fluid dynamics and mechanical properties evaluation.
研究不足
The study acknowledges the complexity and computational cost of including fluid flow motion in laser-based processes. Future work aims to explore more complex fluid dynamics and evaluate mechanical properties of the SLM microstructure.
1：Experimental Design and Method Selection:
A macro thermo-fluid dynamical model was developed in COMSOL using computational fluid dynamics (CFD) to investigate the temperature profile and melt pool characteristics during selective laser melting (SLM). A cellular automata (CA) model was used to simulate microstructural evolution during heat treatment.
2：Sample Selection and Data Sources:
The study focused on Ti-6Al-4V (Ti64) due to its common use in SLM and its mechanical properties.
3：List of Experimental Equipment and Materials:
COMSOL software for CFD modeling; selective laser melting equipment with a laser power of 300 watt and laser beam radius of 100 μm.
4：Experimental Procedures and Operational Workflow:
The laser scans the top surface of a Ti64 powder layer with a scanning speed of 220 mm/s. The process is modeled over a computational domain of 3 mm by 1.5 mm by 1.5 mm, with symmetry boundary conditions applied.
5：5 mm by 5 mm, with symmetry boundary conditions applied.
Data Analysis Methods:
5. Data Analysis Methods: The model outputs were analyzed to determine temperature gradients, cooling rates, and growth velocities, which were then used to predict grain morphology and microstructural evolution.
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