Controlling defects of laser-powder bed fusion processed 316L stainless steel via ultrasonic nanocrystalline surface modification

Rae Eon Kim, Sang Guk Jeong, Hyojeong Ha, Do Won Lee, Auezhan Amanov, Hyoung Seop Kim

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Metal additive manufacturing (MAM) offers an excellent capability for designing complex geometries with topology-optimized and near-net-shaped structures. The optimization-designed MAM parts with constrained volume require superior mechanical properties to broaden their utilization in the industry. However, the intrinsic defects generated during the building process deteriorate the mechanical functionality and limit utilization in various industrial applications. In this study, we propose a new strategy to reduce generated defects using ultrasonic nanocrystal surface modification (UNSM) on laser powder bed fusion (LPBF) processed 316L stainless steel. Subsurface pores and high surface roughness in MAM parts were significantly improved through the impact of UNSM treatment, and a gradient structure with mechanical incompatibility was developed. Consequently, the LPBF-processed samples after UNSM treatment show the excellent combination of strength and ductility, which is attributed to the high synergistic hardening from the gradient microstructure and the suppression of damage evolution by controlling built defects.

Original languageEnglish
Article number145726
JournalMaterials Science and Engineering: A
Volume887
DOIs
Publication statusPublished - 6 Nov 2023
Publication typeA1 Journal article-refereed

Keywords

  • Austenitic stainless steels
  • Defects
  • Gradient structure
  • Laser powder bed fusion
  • Ultrasonic nanocrystal surface modification

Publication forum classification

  • Publication forum level 2

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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