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Application of ultrasonic nanocrystal surface modification for improving surface profile of DEDed AISI 316L

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Abstract

This study investigated the effect of ultrasonic nanocrystal surface modification (UNSM) on the deteriorated surface of AISI 316L deposited using the direct energy deposition (DED) technology. After UNSM treatment, the coarse DEDed surface was fined, and a regular micro-surface profile was implemented. Compared to the case before UNSM treatment, the waviness and roughness of the surface after UNSM treatment decreased by up to 73.8 % and 86.2 %, respectively, and reduced further as the UNSM interval was decreased. Surface severe plastic deformation (S2PD) was induced in the dendrite structure of the UNSM-treated DEDed sample surface. The microstructure was deformed till a depth of up to 92.13 mm from the surface and was significantly affected by the interval. After UNSM treatment, the hardness improved by up to 71.5 % and gradually decreased from the surface to the inside; the hardness was improved by UNSM up to a maximum depth of 400 μm. Although the UNSM interval condition had a significant effect on the DEDed surface, it barely affected the relationship between the directions of DED deposition and UNSM treatment. This study confirmed that the UNSM technology can effectively improve a DEDed surface.

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Acknowledgments

This study was supported by the Ministry of Trade, Industry and Energy (MOTIE) and the Korea Institute for Advancement of Technology (KIAT) through the European International R&D Collaboration (G02P03040000701), Republic of Korea. Additional support by the Korea Maritime and Ocean University Research Fund is gratefully acknowledged.

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Authors and Affiliations

  1. Department of Ocean Advanced Materials Convergence Engineering, Korea Maritime and Ocean University, Busan, 49112, Korea

    Min-Seob Kim & Do-Sik Shim

  2. School of Mechanical Engineering, Pusan National University, Busan, 46241, Korea

    Yeong-Kwan Jo & Sang-Hu Park

Authors
  1. Min-Seob Kim
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  2. Yeong-Kwan Jo
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  3. Sang-Hu Park
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  4. Do-Sik Shim
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Corresponding authors

Correspondence to Sang-Hu Park or Do-Sik Shim.

Additional information

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

Min-Seob Kim is a currently a M.S. student at the Department of Ocean Advanced Materials Convergence Engi-neering, Korea Maritime and Ocean University, Korea. He received his bachelor’s degree at Korea Maritime and Ocean University, Korea in 2018.

Yeong-Kwan Jo is a Ph.D. course student at the School of Mechanical Engineering in Pusan National University. His research topic interests are development of cladding process and its application to surface mechanical characteristics.

Sang Hu Park is a Professor in the School of Mechanical Engineering at Pusan National University. He earned his M.A. and Ph.D. in mechanical engi-neering at Korea Advanced Institute of Science and Technology (KAIST, Korea) in 1996 and 2006, respectively. His research fields are the development of 3D printing process, mechanical design, and manufacturing technology, especially for multi-scale structures.

Do-Sik Shim received Ph.D. in Mechanical Engineering from KAIST, Korea in 2010. He has been an Assistant Professor at Korea Maritime and Ocean University (KMOU) since 2017. His research interests include incremental and roll forming for sheet metal, direct energy deposition (DED) and structural analysis as well as optimal design.

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Kim, MS., Jo, YK., Park, SH. et al. Application of ultrasonic nanocrystal surface modification for improving surface profile of DEDed AISI 316L. J Mech Sci Technol 33, 5659–5667 (2019). https://doi.org/10.1007/s12206-019-1108-1

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  • DOI: https://doi.org/10.1007/s12206-019-1108-1

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