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An experimental study on microstructural characteristics and mechanical properties of stainless-steel 316L parts using directed energy deposition (DED) process

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Abstract

We investigated the microstructural characteristics and mechanical properties of stainless-steel 316L parts fabricated by directed energy deposition (DED) process, which is one of the additive manufacturing (AM) technologies. In this research, the 316L parts were fabricated by DED process by varying three process parameters: Laser power, scanning speed and mass flow rate of powder. A total of eight experimental cases were sorted out, and the DED parts from each experimental case were characterized in views of composition, defects, geometrical height, micro-hardness, friction and modulus. The analysis showed that the mechanical properties–micro-hardness, friction and modulus–of the 316L parts can be maximized in the case of the low laser power (400 W), high scanning speed (10 mm/s) and low mass flow rate of powder (10 g/min). In addition, the defects such as blowholes and cracks can be minimized under the condition of the low laser power (400 W) and low mass flow rate (10 g/min), respectively.

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Acknowledgments

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea Government (MSIP) (NRF-2018R1A2A1A05079477, NRF-2015R1A2A1 A10055948).

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Authors and Affiliations

  1. Department of Mechanical Engineering, Graduate School, Sungkyunkwan University, Suwon, 16419, Korea

    Jung Sub Kim & Byoung Joo Kang

  2. School of Mechanical Engineering, Sungkyunkwan University, Suwon, 16419, Korea

    Sang Won Lee

Authors
  1. Jung Sub Kim
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  2. Byoung Joo Kang
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  3. Sang Won Lee
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Corresponding author

Correspondence to Sang Won Lee.

Additional information

This paper was presented at ICMDT 2019, Shiroyama Hotel, Kagoshima, Japan, April 24-27, 2019. Recommended by Guest Editor Haedo Jeong.

Jung Sub Kim received his B.S. in Mechanical Engineering, Catholic University of Daegu, Korea, in 2014. He is currently a Ph.D. candidate in Mechanical Engineering, Sungkyunkwan University, Suwon, Korea. His research interests include metal and polymer additive manufacturing and environmentally- friendly mechanical machining technologies.

Byoung Joo Kang received his B.S. in Mechanical Engineering, Gachon University, Korea, in 2017. He also received his M.S. from Mechanical Engineering, Sungkyunkwan University, Suwon, Korea in 2019. His research interests include smartization of manufacturing processes and equipment. He recently joined the Smart Factory Control Team at LG CNS in 2019 as an Application Development Associate.

Sang Won Lee received his B.S. and M.S. in Mechanical Design and Production Engineering from Seoul National University, Korea, in 1995 and 1997. He received the Ph.D. in Mechanical Engineering from University of Michigan in 2004. Dr. Lee joined the School of Mechanical Engineering at Sungkyunkwan University in 2006 and is currently a Professor. His research interests include additive manufacturing, environmentallyfriendly mechanical machining, smart manufacturing and data-driven design.

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Kim, J.S., Kang, B.J. & Lee, S.W. An experimental study on microstructural characteristics and mechanical properties of stainless-steel 316L parts using directed energy deposition (DED) process. J Mech Sci Technol 33, 5731–5737 (2019). https://doi.org/10.1007/s12206-019-1116-1

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  • DOI: https://doi.org/10.1007/s12206-019-1116-1

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