In this study, Al-Si-Mg alloys are additively manufactured using a selective laser melting (SLM) process from AlSi10Mg powders prepared from a gas-atomization process. The processing parameters such as laser scan speed and laser power are investigated for 3D printing of Al-Si-Mg alloys. The laser scan speeds vary from 100 to 2000 mm/s at the laser power of 180 and 270W, respectively, to achieve optimized densification of the Al-Si-Mg alloy. It is observed that the relative density of the Al-Si-Mg alloy reaches a peak value of 99% at 1600 mm/s for 180W and at 2000 mm/s for 270W. The surface morphologies of the both Al-Si-Mg alloy samples at these conditions show significantly reduced porosities compared to those of other samples. The increase in hardness of as-built Al-Si-Mg alloy with increasing scan speed and laser power is analyzed due to high relative density. Furthermore, it was found that cooling conditions after the heat-treatment for homogenization results in the change of dispersion status of Si phases in the Al-Si matrix but also affects tensile behaviors of Al-Si-Mg alloys. These results indicate that combination between SLM processing parameters and post-heat treatment should be considered a key factor to achieve optimized Al-Si alloy performance.

Citations

Citations to this article as recorded by  

• Fabrication and mechanical properties of Al–Si-based alloys by selective laser melting process
  Yeong Seong Eom, Kyung Tae Kim, Dong Won Kim, Soo ho Jung, Jung Woo Nam, Dong Yeol Yang, Jungho Choe, Ji Hun Yu, Injoon Son
  Powder Metallurgy.2021; 64(3): 198.     CrossRef
• Investigation on Interfacial Microstructures of Stainless Steel/Inconel Bonded by Directed Energy Deposition of alloy Powders
  Yeong Seong Eom, Kyung Tae Kim, Soo-Ho Jung, Jihun Yu, Dong Yeol Yang, Jungho Choe, Chul Yong Sim, Seung Jun An
  Journal of Korean Powder Metallurgy Institute.2020; 27(3): 219.     CrossRef
• Influence of Powder Size on Properties of Selectively Laser-Melted- AlSi10Mg Alloys
  Yeong Seong Eom, Dong Won Kim, Kyung Tae Kim, Sang Sun Yang, Jungho Choe, Injoon Son, Ji Hun Yu
  Journal of Korean Powder Metallurgy Institute.2020; 27(2): 103.     CrossRef

In this study, STS316L powders prepared by gas atomization are used to manufacture bulk structures with dimensions of 10 × 10 × 10 mm³ using selective laser melting (SLM). The microstructures and hardness of the fabricated 316L stainless steel has been investigated with the laser beam overlap varied from 10% to 70%. The microstructures of the fabricated STS316L samples show a decrease in the balling and satellite of powders introducing defect in the bulk samples and the porosity caused by the gap between the molten metal pools disappearing as the overlap ratio increases, whereas a low overlap ratio results in significant balling and a large amount of isolated powders due to the increased gap between the melt pools. Furthermore, the highest value in Vickers hardness is obtained for the sample fabricated by 30% overlapped laser beams. These results show that the overlap ratio of laser beams in the SLM process should be considered as an important process parameter.

Citations

Citations to this article as recorded by  

• Fabrication and mechanical properties of Al–Si-based alloys by selective laser melting process
  Yeong Seong Eom, Kyung Tae Kim, Dong Won Kim, Soo ho Jung, Jung Woo Nam, Dong Yeol Yang, Jungho Choe, Ji Hun Yu, Injoon Son
  Powder Metallurgy.2021; 64(3): 198.     CrossRef
• Effect of laser remelting on the surface characteristics of 316L stainless steel fabricated via directed energy deposition
  Seung Yeong Cho, Gwang Yong Shin, Do Sik Shim
  Journal of Materials Research and Technology.2021; 15: 5814.     CrossRef
• Investigation on Interfacial Microstructures of Stainless Steel/Inconel Bonded by Directed Energy Deposition of alloy Powders
  Yeong Seong Eom, Kyung Tae Kim, Soo-Ho Jung, Jihun Yu, Dong Yeol Yang, Jungho Choe, Chul Yong Sim, Seung Jun An
  Journal of Korean Powder Metallurgy Institute.2020; 27(3): 219.     CrossRef
• Influence of Powder Size on Properties of Selectively Laser-Melted- AlSi10Mg Alloys
  Yeong Seong Eom, Dong Won Kim, Kyung Tae Kim, Sang Sun Yang, Jungho Choe, Injoon Son, Ji Hun Yu
  Journal of Korean Powder Metallurgy Institute.2020; 27(2): 103.     CrossRef
• Microstructural effects on the tensile and fracture behavior of selective laser melted H13 tool steel under varying conditions
  Jungsub Lee, Jungho Choe, Junhyeok Park, Ji-Hun Yu, Sangshik Kim, Im Doo Jung, Hyokyung Sung
  Materials Characterization.2019; 155: 109817.     CrossRef
• Microstructures and Characterization of Al-Si-Mg Alloy Processed by Selective Laser Melting with Post-Heat-treatment
  Gi Seung Lee, Yeong Seong Eom, Kyung Tae Kim, Byoung Kee Kim, Ji Hun Yu
  Journal of Korean Powder Metallurgy Institute.2019; 26(2): 138.     CrossRef
• Correlation between Microstructure and Mechanical Properties of the Additive Manufactured H13 Tool Steel
  Woojin An, Junhyeok Park, Jungsub Lee, Jungho Choe, Im Doo Jung, Ji-Hun Yu, Sangshik Kim, Hyokyung Sung
  Korean Journal of Materials Research.2018; 28(11): 663.     CrossRef