Journal
OPTICS AND LASER TECHNOLOGY
Volume 98, Issue -, Pages 23-32Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.optlastec.2017.07.034
Keywords
Selective laser melting; Finite element simulation; Subsequent thermal cycling; Single-track & multi-layer; Microstructure
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Funding
- K.C. Wong Magna Fund in Ningbo University
- Natural Science Foundation of Zhejiang Province of China [LQ17E050001]
- The Foundation of Zhejiang Provincial Key Laboratory of Laser Processing Robot/ Key Laboratory of Laser Precision Processing Detection [lzsy-05]
- National Natural Science Foundation of China [51605338]
- Advanced Programs of Postdoctoral Research of Zhejiang [156184]
- Science and Technology Project of Wenzhou [G20150003]
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Subsequent thermal cycling (STC), as the unique thermal behavior during the multi-layer manufacturing process of selective laser melting (SLM), brings about unique microstructure of the as-produced parts. A multi-layer finite element (FE) model was proposed to study the STC along with a contrast experiment. The FE simulational results show that as layer increases, the maximum temperature, dimensions and liquid lifetime of the molten pool increase, while the heating and cooling rates decrease. The maximum temperature point shifts into the molten pool, and central of molten pool shifts backward. The neighborly underlying layer can be remelted thoroughly when laser irradiates a powder layer, thus forming an excellent bonding between neighbor layers. The contrast experimental results between the single -layer and triple -layer samples show that grains in of latter become coarsen and tabular along the height direction compared with those of the former. Moreover, this effect become more serious in 2nd and 1st layers in the triple -layer sample. All the above illustrate that the STC has an significant influence on the thermal behavior during SLM process, and thus affects the microstructure of SLMed parts. (C) 2017 Elsevier Ltd. All rights reserved.
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