Laser Metal Deposition (LMD) is an effective process to fabricate Functionally Graded Material (FGM) from pre-mixed powders. Since the supplied multi-powder directly affects the deposited FGM’s composition, investigation on Pre-Mixed Multi-Powder (PMMP) flow during LMD is greatly needed. This paper presents a comprehensive numerical PMMP flow model. By solving discrete particle force balance equations coupled with continuity equations and momentum equations for carrier gas, the dynamic behavior of PMMP flow through powder feeder tube and out of nozzle was calculated. With this model, the particle sizes of multi-powder were optimized to obtain considered FGM composition. To verify the modeling results, pre-mixed Cu and 4047 Al powder was transported and patterned in an epoxy resin coating after exiting nozzle. The distribution of exiting pre-mixed powder was plotted by quantifying the different color area. The gathered distribution data was used to estimate the exiting pre-mixed powder’s com-position, and finally validate modeling results.
W. Li et al., "Modeling and Experimental Investigation of Pre-Mixed Multi-Powder Flow in Fabricating Functional Gradient Material by Laser Metal Deposition Process," Proceedings of the 27th Annual International Solid Freeform Fabrication Symposium (2016, Austin, TX), pp. 287-305, University of Texas at Austin, Aug 2016.
27th Annual International Solid Freeform Fabrication Symposium -- An Additive Manufacturing Conference (2016: Aug. 8-10, Austin, TX)
Mechanical and Aerospace Engineering
Materials Science and Engineering
Intelligent Systems Center
Keywords and Phrases
Functionally Gradient Material; Pre-Mixed Multi-Powder; FGM composition; Numerical modeling
Article - Conference proceedings
10 Aug 2016