A Fluid-Dynamic Numerical Model for the Selective Laser Melting of High-Thickness Metallic Layers

Cordovilla Baró, Francisco and Garzón, Miguel and Muñoz, Diego Alejandro and Díaz, Javier and García Beltrán, Ángel and Ocaña Moreno, José Luis (2017). A Fluid-Dynamic Numerical Model for the Selective Laser Melting of High-Thickness Metallic Layers. In: "LiM 2017 International conference on Lasers in Manufacturing", 26/29.06.2017, Munich - Germany. pp. 1-10.

Description

Title: A Fluid-Dynamic Numerical Model for the Selective Laser Melting of High-Thickness Metallic Layers
Author/s:
  • Cordovilla Baró, Francisco
  • Garzón, Miguel
  • Muñoz, Diego Alejandro
  • Díaz, Javier
  • García Beltrán, Ángel
  • Ocaña Moreno, José Luis
Item Type: Presentation at Congress or Conference (Article)
Event Title: LiM 2017 International conference on Lasers in Manufacturing
Event Dates: 26/29.06.2017
Event Location: Munich - Germany
Title of Book: LiM 2017 International conference on Lasers in Manufacturing
Date: June 2017
Subjects:
Freetext Keywords: SLM; ALE Method; Marangoni Convection; Fluid Dynamics
Faculty: E.T.S.I. Industriales (UPM)
Department: Física Aplicada e Ingeniería de Materiales
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Productivity in the Selective Laser Melting Process (SLM) is directly related with the thickness of the powder bed that is repeatedly applied, at every increment, in the growing of consolidated material in the additive manufacturing process. Although most of the relevant phenomena (limited diffusivity associated to particles contact, phase changes, gradients of surface tension associated with Marangoni convection, or even recoil pressure) are considered in the models with small bed thicknesses (roughly 20 µm ? 40 µm), in the case of larger thicknesses (between 100 µm and 200 µm) these factors strongly influence the size and shape of the fusion bath leading to a non trivial geometry of the final consolidated material. The present work proposes the use of the Arbitrary Lagrangean-Eulerian method (ALE method) to solve the thermal and Navier-Stokes equations in the frame of a free-moving discretization to predict simultaneously the space-time temperature evolution and the associated fusion bath dynamics. It allows for using a continuous domain to represent the powder bed, which, instead of a particle model approach, is advantageously compatible with realistic process parameters, where long paths are covered by the laser. The model was validated with experimental data using Inconel as working material, showing a good degree of agreement.

More information

Item ID: 50015
DC Identifier: http://oa.upm.es/50015/
OAI Identifier: oai:oa.upm.es:50015
Official URL: https://www.invest-in-bavaria.com/en/info-centre/events/detail/1402-lim-2017.html
Deposited by: Memoria Investigacion
Deposited on: 19 Jun 2018 14:33
Last Modified: 30 Jun 2018 22:30
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