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Proceedings Paper

Microscopic simulation of the effect of process parameters by the Marangoni convection on the temperature field of Inconel 718 alloy using selective laser melting
Author(s): Pudan Zhang; Dongyun Zhang; Zhen Liu; Ziming Kang; Yang Gao; Lingshan Li
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Paper Abstract

A 3D transient finite element model of Inconel 718 nickel-based superalloy processed by selective laser melting was developed to study the heat flux in the molten pool under the condition of different process parameters and its effect on the temperature field and the shape of molten pool, in which a solid heat transfer module and a laminar flow module in the finite element simulation software COMSOL Multiphysics was applied. In the simulation several special phenomenon characterized with SLM process was considered, such as the interaction between the laser and material with stochastic porosity distribution on powder bed, and the nonlinear change of thermophysical properties due to the state change of material and the influence of the Marangoni effect in the molten pool. The results show that the Marangoni effect caused by the surface tension of molten pool makes the convective heat flux play a leading role in the heat transfer process in the molten pool, and its depth/width ratio is changed by changing the magnitude and direction of the heat flow, what determines the shape of molten pool. The increase in laser power or reduced scanning speed can increase the heat input per unit time, and then lead to a Marangoni convection enhancement within the molten pool, thus enlarge the size of the molten pool. The experimental results are in good agreement with the simulation results.

Paper Details

Date Published: 12 November 2018
PDF: 20 pages
Proc. SPIE 10813, Advanced Laser Processing and Manufacturing II, 108130Z (12 November 2018); doi: 10.1117/12.2502827
Show Author Affiliations
Pudan Zhang, Beijing Univ. of Technology (China)
Dongyun Zhang, Beijing Univ. of Technology (China)
Zhen Liu, Beijing Univ. of Technology (China)
Ziming Kang, Beijing Univ. of Technology (China)
Yang Gao, Beijing Univ. of Technology (China)
Lingshan Li, Beijing Univ. of Technology (China)

Published in SPIE Proceedings Vol. 10813:
Advanced Laser Processing and Manufacturing II
Rongshi Xiao; Minghui Hong; Jian Liu, Editor(s)

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