Journal
INTERNATIONAL JOURNAL OF MACHINE TOOLS & MANUFACTURE
Volume 100, Issue -, Pages 14-24Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijmachtools.2015.10.004
Keywords
Selective laser melting; Additive manufacturing; Thermo-capillary convection; Particle distribution
Funding
- National Natural Science Foundation of China, China [51322509, 51575267]
- Outstanding Youth Foundation of Jiangsu Province of China [BK20130035]
- Program for New Century Excellent Talents in University, China [NCET-13-0854]
- Science and Technology Support Program (The Industrial Part), Jiangsu Provincial Department of Science and Technology of China [BE2014009-2]
- 333 Project [BRA2015368]
- Science and Technology Foundation for Selected Overseas Chinese Scholar, Ministry of Human Resources and Social Security, China the Program for Distinguished Talents of Six Domains in Jiangsu Province of China [2013-XCL-028]
- Fundamental Research Funds for the Central Universities [NE2013103, NP2015206]
- Funding for Outstanding Doctoral Dissertation in NUAA, China [BCXJ15-08]
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A transient three dimensional model for describing the thermo-capillary convection and migration behavior and the resultant distribution state of reinforcing particles during selective laser melting of AlN/AlSi10Mg is proposed. The powder-solid transformation, temperature dependent physical properties and interaction between the reinforcement and the melt are taken into account. The effect of the laser energy per unit length (LEPUL) on the molten pool dynamics, cooling rate and the resultant sizes and distribution state of AlN reinforcement has been investigated. It shows that the thermo-capillary convection pattern changes from inward flow pattern to outward one, due to the appearance of the oxidation in molten pool. Therefore, the morphology of the top surface undergoes a continuous variation from the balling phenomenon, to the discontinuous tracks and finally to the formation of a flat and dense one. Meanwhile, both the clockwise and counterclockwise convection patterns are produced in the molten pool, caused by the interaction of reinforcing particles and the melt. An increase in LEPUL will significantly intensify the thermo-capillary convection whereas result in a decrease in the cooling rate of the molten pool. As LEPUL decreases from 1800 J/m to 450 J/m, the distribution state of AlN particles changes from the severe aggregation, then to the formation of partial aggregation and finally to the homogeneous distribution in the solidified matrix. The particle sizes of AlN reinforcement are experimentally acquired, which are in a good agreement with the results predicted by simulation. (C) 2015 Elsevier Ltd. All rights reserved.
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