BROWSE

Related Researcher

Author's Photo

Jeong, Hoon Eui
Multiscale Biomimetics & Manufacturing Lab
Research Interests
  • Biomimetics
  • Multiscale manufacturing
  • Micro/nanofabrication

ITEM VIEW & DOWNLOAD

Enhancement of the surface properties of selective laser melted maraging steel by large pulsed electron-beam irradiation

Cited 0 times inthomson ciCited 0 times inthomson ci
Title
Enhancement of the surface properties of selective laser melted maraging steel by large pulsed electron-beam irradiation
Author
Narayanan, T. S. N. SankaraKim, JisooJeong, Hoon EuiPark, Hyung Wook
Issue Date
2020-05
Publisher
Elsevier BV
Citation
ADDITIVE MANUFACTURING, v.33, pp.UNSP 10112
Abstract
The present work aimed to decrease the surface roughness of maraging steel (MS) by selective laser melting (SLM) using large pulsed electron-beam (LPEB) irradiation as a post-treatment. The MS samples were fabricated using different combinations of laser power, scanning speed, hatch distance, and build angle. The morphological features, surface roughness, phase content, and corrosion resistance of the MS samples in their as-fabricated (ASF) state were compared after LPEB irradiation. The ASF SLM-MS samples exhibit the presence of partially melted particles that spread over the entire surface and many cracks in both the longitudinal and transverse directions. A higher arithmetical mean height (S-a: 2 -17 mu m), large variations in S-a measured at various locations, and a strong dependence of S-a on build angle were also observed. Post-treatment by LPEB irradiation removed the partially melted particles, while reflow of the molten mass filled the cracks and voids and facilitated the formation of a uniform surface with a bright metallic finish. This has resulted in a significant decrease in S-a (0.50-4.50 mu m) and a smaller variation in S-a measured at different locations. Body-centered cubic a-martensite was the predominant phase for the ASF SLM-MS samples, along with a small fraction face-centered cubic gamma-austenite phase. After LPEB irradiation, the martensite was reverted to the austenite phase. The corrosion resistance of the LPEB-irradiated samples was moderately better than that of the ASF SLM-MS samples. The uniform surface morphology, removal of partially melted particles, absence of pores and cracks, decrease in S-a, and moderate improvement in corrosion resistance suggests that LPEB irradiation can be used as a post-treatment for SLM-MS samples.
URI
https://scholarworks.unist.ac.kr/handle/201301/33012
URL
https://www.sciencedirect.com/science/article/pii/S221486041931646X?via%3Dihub
DOI
10.1016/j.addma.2020.101125
ISSN
2214-8604
Appears in Collections:
MEN_Journal Papers
Files in This Item:
There are no files associated with this item.

find_unist can give you direct access to the published full text of this article. (UNISTARs only)

Show full item record

qrcode

  • mendeley

    citeulike

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

MENU