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

Effect of Process Parameters on Surface Roughness and Porosity of Direct Laser Melted Bead

DLM 공정시 공정변수에 따른 내부공극률과 표면조도 변화

  • 김태현 (부산대학교 기계공학부/정밀정형 및 금형 가공 연구소) ;
  • 장정환 (부산대학교 기계공학부/정밀정형 및 금형 가공 연구소) ;
  • 전찬후 (부산대학교 기계공학부/정밀정형 및 금형 가공 연구소) ;
  • 문영훈 (부산대학교 기계공학부)
  • Received : 2011.10.17
  • Accepted : 2011.11.08
  • Published : 2011.12.01
Download PDF
⟨ Previous Next ⟩

Abstract

Direct laser melting(DLM) is promising as a joining method for producing parts for automobiles, aerospace, marine and medical applications. An advantageous characteristic of DLM is that it affects the parent metal very little. The mechanical properties of parts made by DLM are strongly affected by the porosity and surface roughness of the laser melted beads. This is a systematic study of the effects of the porosity and surface roughness of laser melted beads using various processing parameters, such as laser power, scan rate and overlapping ratio of the fill spacing. The specimens were fabricated with 316L and 304L austenitic stainless steel powder. Dense parts with low porosity were obtained at low laser scan speed, as it increased the aspect ratio of the parental material and the depth of penetration. The variations of surface roughness were examined at various processing parameters such as overlapping ratio and laser power.

Keywords

References

  1. J. Y. Jeng, M. C. Lin, 2001, Mold Fabrication and Modification using Hybrid Processes of Selective Laser Cladding and Milling, J. Mater. Process. Technol., Vol. 110, No. 1, pp. 98-103. https://doi.org/10.1016/S0924-0136(00)00850-5
  2. B. D. Joo, J. H. Jang, H. S. Yim, Y. M. Son, Y. H. Moon, 2009, Effect of Process Parameters on Forming Characteristics of Selective Laser Sintered Fe-Ni-Cr Powder, Trans. Mater. Process., Vol. 18, No. 3, pp. 262-267. https://doi.org/10.5228/KSPP.2009.18.3.262
  3. M. D. Montasser, J. K. Lim, K. W. Dalgarno, 2008, A Comparison between Direct and Indirect Laser Sintering of Metals, J. Mater. Sci. Technol., Vol. 24, No. 2, pp 227-232.
  4. F. Abe, K. Osakada, M. Shiomi, K. Uematsu, M. Matsumo, 2001, The manufacturing of hard tools from metallic powders by selective laser melting, J. Mater. Process. Technol., Vol. 111, No. 1, pp. 210-213. https://doi.org/10.1016/S0924-0136(01)00522-2
  5. Y. Ning, Y. S. Wong, J. Y. H. Fuh, H. T. Loh, 2006, An Approach to Minimize Building Errors in Direct Metal Laser Sintering, IEEE Trans. Autom. Sci. Eng., Vol. 3, No. 1, pp. 73-80. https://doi.org/10.1109/TASE.2005.857656
  6. I. Yadroitsev, I. Smurov, 2010, Selective Laser Melting Technology : From the Single Laser Melted Track Stability to 3D Parts of Complex Shape, Physics Procedia, Vol. 5, Part B, pp. 551-560. https://doi.org/10.1016/j.phpro.2010.08.083
  7. 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
  8. P. Fisher, H. Leber, V. Romano, H. P. Karapatis, C. Andre, R. Glardon, 2004, Microstructure of Nearinfrared Pulsed Laser Sintered Titanium Samples, Appl. Phys. A, Vol. 78, No. 8, pp. 1219-1227. https://doi.org/10.1007/s00339-003-2205-6
  9. M. Y. Sung, B. D. Joo, S. H. Kim, Y. H. Moon, 2010, Process Analysis of Melting Behaviors in Selective Laser Melting Process, Trans. Mater. Process., Vol. 19, No. 8, pp. 517-522. https://doi.org/10.5228/KSTP.2010.19.8.517
  10. J. P. Kruth, L. Froyen, J. Van Vaerenbergh, P. Mercelis, M. Rombouts, B. Lauwers, 2004, Selective Laser Melting of Iron-based Powder, J. Mater. Process. Technol., Vol. 149, No. 1-3, pp. 616-622. https://doi.org/10.1016/j.jmatprotec.2003.11.051
  11. 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
  12. S. Balaji, A. Upadhyaya, 2007, Electrochemical Behavior of Sintered YAG Dispersed 316L Stainless Steel Composites, Mater. Chem. Phys., Vol. 101, No. 2-3, pp. 310-316. https://doi.org/10.1016/j.matchemphys.2006.06.002
  13. Y. W. Mo, Y. T. Yoo, B. H. Shin, H. J. Shin, 2006, Welding Characteristics on Heat Input Changing of Laser Dissimilar Metals Welding, Trans. Kor. Soc. Mach. Tool Eng., Vol. 15, No. 2, pp. 51-58.

Cited by

  1. The Effect of Shielding Gas on Forming Characteristics for Direct Laser Melting vol.22, pp.6, 2013, https://doi.org/10.5228/KSTP.2013.22.6.334
  2. Effect of Powder Morphology on the Deposition Quality for Direct Laser Melting vol.25, pp.3, 2016, https://doi.org/10.5228/KSTP.2016.25.3.195