Journal of the Korean Society of Manufacturing Process Engineers (한국기계가공학회지)

The Korean Society of Manufacturing Process Engineers (한국기계가공학회)
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Surface Quality and Corrosion of Additively Manufactured STS316L Treated by Ultrasonic Nanocrystal Surface Modification

적층제조된 스테인레스 316L에 대한 초음파나노표면개질에 따른 표면특성 및 부식성에 관한 연구

  • Kim, Jun-Ho (Department of Ocean Advanced Materials Convergence, Korea Maritime and Ocean University) ;
  • Oh, Yeong-Taek (Department of Ocean Advanced Materials Convergence, Korea Maritime and Ocean University) ;
  • Park, Han-Byeol (Department of Ocean Advanced Materials Convergence, Korea Maritime and Ocean University) ;
  • Lee, Dong-Ho (Department of Ocean Advanced Materials Convergence, Korea Maritime and Ocean University) ;
  • Kim, Hwa-Jeong (Department of Ocean Advanced Materials Convergence, Korea Maritime and Ocean University) ;
  • Kim, Ui-Jun (Department of Ocean Advanced Materials Convergence, Korea Maritime and Ocean University) ;
  • Shim, Do-Sik (Department of Ocean Advanced Materials Convergence, Korea Maritime and Ocean University)
  • 김준호 (한국해양대학교 해양신소재융합공학과) ;
  • 오영택 (한국해양대학교 해양신소재융합공학과) ;
  • 박한별 (한국해양대학교 해양신소재융합공학과) ;
  • 이동호 (한국해양대학교 해양신소재융합공학과) ;
  • 김화정 (한국해양대학교 해양신소재융합공학과) ;
  • 김의준 (한국해양대학교 해양신소재융합공학과) ;
  • 심도식 (한국해양대학교 해양신소재융합공학과)
  • Received : 2020.04.22
  • Accepted : 2020.06.27
  • Published : 2020.08.31
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Abstract

This study investigated the effects of ultrasonic nanocrystal surface modification (UNSM) on the deteriorated surface of AISI SUS316L additively manufactured (AM) using the powder bed fusion (PBF) technique. Specifically, the effects of UNSM conditions on surface topology, hardness, and anti-corrosion were examined. Before UNSM treatment, the stainless steel 316L powder was processed via the PBF machine to prepare a substrate. We observed surface changes due to UNSM treatments in PBF SUS316L substrates and examined the correlation between topology changes, roughness, hardness, and anti-corrosion. After UNSM treatment, the coarse as-built surface was refined, and a regular micro-profile was implemented. Compared to the non-treated PBF sample, the waviness and roughness of the surfaces after UNSM treatment decreased by up to 56.0% and 94.5%, respectively, and decreased further as the interval decreased. The hardness improved by up to 63.0% at a maximum depth of 500 ㎛ from top surface by the UNSM treatment. The results of the corrosion test showed that the corrosion resistance of the UNSM specimens was moderately improved compared to that of the untreated surface. This study confirmed that UNSM is an effective post-processing technique for additively manufactured parts.

Keywords

References

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