Effects of radiative local heating on metal solidification during selective laser melting for additive manufacturing

Beom Seok Kim, Namkyu Lee, Subhash Thota, Thomas Gemming, Hyung Hee Cho

Research output: Contribution to journalArticle

Abstract

Selective laser melting (SLM) is a promising additive manufacturing technique arising from glassy metal characteristics of treated medium. When creating novel compositions of materials and intricate workpieces, reliable thermal designs should be implemented based on well-understood heat transfer characteristics on matierlas to be used. Herein, we investigate local and overall heat transfer characteristics of SLM processes and investigate the principal parameters related to the magnituge of a radiative heating power and its exposure time. We present how to exert their influence upon local melting and sequential solidification of copper powder bed. The local solid media reach a quasi-equilibrium state in even 1 ms with the incident powers of 50, 100, and 200 W. The anisotropic expansion of the molten pool is governed by a thermally-induced Marangoni flow. As the power is increased, the Marangoni factor increases linearly up to 853.7%. Consequential heat transfer characteristics tell us that unconditional input power should be avoided to prohibit the detrimental effect; the radiative heating power should be confined for thermalization of a target domain and for that preventing the evaporation of a material. These approaches from material science to heat transfer can be used to develop a platform for SLM processes guaranteeing its feasibility and applicability.

Original languageEnglish
Article number143594
JournalApplied Surface Science
Volume496
DOIs
Publication statusPublished - 2019 Dec 1

Fingerprint

3D printers
solidification
Solidification
Melting
manufacturing
Metals
heat transfer
melting
Heat transfer
Heating
heating
Lasers
metals
lasers
Copper powder
Materials science
materials science
Molten materials
beds
Evaporation

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

Cite this

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Effects of radiative local heating on metal solidification during selective laser melting for additive manufacturing. / Kim, Beom Seok; Lee, Namkyu; Thota, Subhash; Gemming, Thomas; Cho, Hyung Hee.

In: Applied Surface Science, Vol. 496, 143594, 01.12.2019.

Research output: Contribution to journalArticle

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