期刊
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
卷 120, 期 5-6, 页码 3947-3961出版社
SPRINGER LONDON LTD
DOI: 10.1007/s00170-022-09029-y
关键词
Additive manufacturing; Melt pool dynamics; Laser powder bed fusion; Finite element method
资金
- Institutional Fund for Regional Scientific, Technological and Innovation Development (FORDECyT) of the National Council of Science and Technology (CONACyT) of Mexico, through the project Aeronautical Strengthening in Mexico's North East Region
A numerical model of laser powder bed fusion (LPBF) was developed to study the behavior of melt pool dynamics. The results showed that melt pool dimensions follow a thermal pattern, and a new criterion was proposed to accurately predict the dimensions.
In laser powder bed fusion (LPBF), the stability of melt pool dynamics determines the overall quality of a manufactured component. In this work, a numerical model of the LPBF process was developed in order to study and fully understand the behavior of the melt pool dynamics. The numerical model takes into account most of the manufacturing parameters, thermophysical properties, an enhanced thermal conductivity approach, and a volumetric heat source in order to precisely simulate LPBF. This research assumes that the energy emitted by the laser interacts with the metal powder with an absorptivity gradient through the layer thickness in order to calculate the thermal history of the process and the evolution of the melt pool dimensions. The obtained results determined that melt pool dimensions follow a thermal pattern, which is caused by the laser scanning strategy of the LPBF process. A new effective width criterion was proposed in the present research in order to accurately relate both calculated and measured dimensions of the melt pool, reducing the relative error of the model and obtaining data scattering with a standard deviation of +/- 7.21 mu m and a relative error of 2.92%.
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