Transactions of Materials Processing (소성∙가공)

The Korean Society for Technology of Plasticity and materials processing (한국소성∙가공학회)
권호 표지
DOI QR코드

DOI QR Code

The Effect of Shielding Gas on Forming Characteristics for Direct Laser Melting

Direct Laser Melting 공정시 차폐가스가 성형 특성에 미치는 영향

  • Received : 2013.06.26
  • Accepted : 2013.07.25
  • Published : 2013.10.01
Download PDF
⟨ Previous Next ⟩

Abstract

Direct Laser Melting is a prototyping process whereby a 3-D part is built layer wise by melting the metal powder with laser scanning. This process is strongly influenced by the shielding gas and the laser operating parameters such as laser power, scan rate, layering thickness, and rescanning. The shielding gas is especially important in affecting the microstructure and mechanical properties. In the current study, fabrication experiments were conducted in order to analyze the effect of shielding gas on the forming characteristics of direct laser melting. Cylindrical parts were produced from a Fe-Ni-Cr powder with a 200W fiber laser. Surface quality, porosity and hardness as a function of the layering thickness and shield gas were evaluated. By decreasing the layering thickness, the surface quality improved and porosity decreased. The selection of which shield gas, Ar or $N_2$, to obtain better surface quality, lower porosity, and higher hardness was examined. The formability and mechanical properties with a $N_2$ atmosphere are better than those parts formed under an Ar atmosphere.

Keywords

References

  1. A. Amirsadeghi, M. H. Sohi, SF. K. Bozorg, 2008, Effects of TIG Surface Melting and Chromium Surface Alloying on Microstructure, Hardness and Wear Resistance of ADI, J. Iron. Steel Res. Int., Vol. 15, No. 4, pp. 86-94. https://doi.org/10.1016/S1006-706X(08)60150-8
  2. B. D. Joo, J. H. Jang, J. H. Lee, Y. H. Moon, 2009, Effect of Laser Parameters on Sintered Powder Morphology, J. Mater. Sci. Technol., Vol. 26, No. 4, pp. 375-378.
  3. T. H. Kim, J. H. Jang, C. H. Jeon, Y. H. Moon, 2011, Effect of Process Parameters on Surface Roughness and Porosity of Direct Laser Melted Bead, Trans. Mater. Process., Vol. 20, No. 8, pp. 575-580. https://doi.org/10.5228/KSTP.2011.20.8.575
  4. I. Yadroitsev, Ph. Bertrand, I. Smurov, 2007, Parametric Analysis of the Selective Laser Melting Process, Appl. Surf. Sci., Vol. 253, No. 19, pp. 8064-8069. https://doi.org/10.1016/j.apsusc.2007.02.088
  5. R. Mogan, C. J. Sutcliffe, W. o'neill, 2004, Density Analysis of Direct Metal Laser Re-Melted 316L Stainless Steel Cubic Primitives, J. Mater. Sci., Vol. 39, No. 4, pp. 1195-1205. https://doi.org/10.1023/B:JMSC.0000013875.62536.fa
  6. A. Simchi, 2006, Direct Laser Sintering of Metal Powder: Mechanism, Kinetics and Microstructural Features, Mater. Sci. Eng. A, Vol. 428, No. 1-2, pp. 148-158. https://doi.org/10.1016/j.msea.2006.04.117
  7. G. Tani, G. Campana, A. Fortunato, A. Ascari, 2007, The Influence of Shielding Gas in Hybrid LASER- MIG Welding, Appl. Surf. Sci., Vol. 253, No. 19, pp. 8050-8053. https://doi.org/10.1016/j.apsusc.2007.02.144
  8. G. Campana, A. Ascari , A. Fortunato, G. Tani, 2009, Hybrid Laser-MIG Welding of Aluminum Alloys: The Influence of Shielding Gases, Appl. Surf. Sci., Vol. 255, No. 10, pp. 5588-5590. https://doi.org/10.1016/j.apsusc.2008.07.169
  9. T. Sibillano, A. Ancona, V. Berard, E. Schingaro, G. Basile, P. M. Lugara, 2006, A Study of the Shielding Gas Influence on the Laser Beam Welding of AA5083 Aluminium Alloys by In-Process Spectroscopic Investigation, Opt. Lasers Eng., Vol. 44, No. 10, pp. 1039-1051. https://doi.org/10.1016/j.optlaseng.2005.09.002

Cited by

  1. Functionally Graded Properties Induced by Direct Laser Melting of Compositionally Selected Metallic Powders vol.23, pp.5, 2014, https://doi.org/10.5228/KSTP.2014.23.5.303