研究目的
To develop a numerical tool capable of predicting laser power and speed ranges for manufacturing porosity-free printed parts in selective laser melting processes, without the need for specific experimental activities for each alloy.
研究成果
The developed model provides a simplified yet effective tool for predicting laser operating windows for various alloys in selective laser melting processes, reducing the need for extensive experimental testing. It captures common features of the printing process across different alloys, allowing for the prediction of printing behavior based on physical properties.
研究不足
The model contains simplifications of the complex reality, such as ignoring surface tension effects, evaporation, and plasma formation. It cannot calculate porosity due to deep keyhole but only the threshold for its formation. The model's predictions for porosity due to lack of fusion show discrepancies with experimental data.
1：Experimental Design and Method Selection:
The model uses a simplified approach to simulate the generation of single tracks on a powder bed system in a selective laser melting process, focusing on heat transfer and predicting the shape and dimensions of the melted volume.
2：Sample Selection and Data Sources:
Literature data on track geometry (width and depth) and relative density for Ti6Al4V, Inconel625, Al7050, 316L, and pure copper are used for model adjustment.
3：List of Experimental Equipment and Materials:
The model is developed using the commercial code ANSYS Fluent, Release
4：Experimental Procedures and Operational Workflow:
The model simulates heat transfer and fluid dynamics in the printing process, with simplifications such as ignoring surface tension effects, evaporation, and plasma formation.
5：Data Analysis Methods:
The model's predictions are compared with experimental data to validate its accuracy.
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