Density Gradient Materials by Direct Metal Laser Sintering

Abstract:

The direct metal laser sintering process was applied to produce density gradient materials of stainless steel 316L. In order to understand the mechanism of forming porous structure, the influence of laser power, scan rate and scan pitch on the porosity were investigated by measuring density of produced samples and observing cross-sectional microstructures. Laser power greatly affected to the porosity by forming clusters of melted metal powders. It was found that the size change of clusters plays a role in forming porous structure. Eventually, three dimensional sample owing density gradient structures was manufactured.

• Periodical: Advanced Materials Research (Volumes 89-91)
• Pages: 281-284
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.89-91.281
• Online since: January 2010
• Authors: Hyun Goo Kang, Toshiko Osada, Hideshi Miura
• Keywords: 316L Stainless Steel, Density Gradient Material, Direct Metal Laser Sintering, Pores Forming Mechanism

References

[1] Chua C. K., Leong K. F., and Lim C. S., Rapid Prototyping: Principles and Applications. 2nd ed. (2003), Singapore: World Scientific Publishing.

[2] M. M. Dewidar, K. A. Khalil and J. K. Lim, Transactions of Nonferrous Metals Society of China, Vol. 17 (2007), pp.468-473.

DOI: 10.1016/s1003-6326(07)60117-4

[3] H. Miura, H. Maeda, M. Uemura, T. Takemasu and M. Otsu, Mater. Sci. Forum, Vol 534-536 (2007), pp.465-468.

DOI: 10.4028/www.scientific.net/msf.534-536.465

[4] G. N. Levy, R. Schindel and J. P. Kruth, CIRP Annals - Manufacturing Technology, Vol. 52 No. 2 (2003), pp.589-609.

DOI: 10.1016/s0007-8506(07)60206-6

[5] A. Simchi, Mater. Sci. Eng., A, Vol. 428 (2006), pp.148-158.

[6] D. Gu and Y. Shena, Appl. Surf. Sci., Vol. 255 No. 5 (2008).