Repository logo

Infoscience

  • English
  • French
Log In
Logo EPFL, École polytechnique fédérale de Lausanne

Infoscience

  • English
  • French
Log In
  1. Home
  2. Academic and Research Output
  3. Journal articles
  4. Effect of Y2O3 dispersoids on microstructure and creep properties of Hastelloy X processed by laser powder-bed fusion
 
research article

Effect of Y2O3 dispersoids on microstructure and creep properties of Hastelloy X processed by laser powder-bed fusion

Rakhmonov, Jovid U.
•
Kenel, Christoph
•
De Luca, Anthony
Show more
December 1, 2022
Additive Manufacturing Letters

Laser powder bed fusion (LPBF) was used to consolidate powders of a Ni-Cr-Fe-Mo alloy (Hastelloy X) blended with 1 wt% Y2O3 nanometric powders. The nearly-dense, crack-free specimens, with and without oxide dispersion strengthening (ODS), exhibit high-aspect ratio grains, aligned in the build direction and with a strong texture: & LeftAngleBracket;001 & RightAngleBracket; is aligned along both build direction and laser scanning direction. Creep tests performed at 950 & DEG;C, with compressive stresses aligned with the elongated grains (and the build direction), reveal two creep regimes:(i) at stresses below & SIM;50 MPa, diffusional creep dominates, and the ODS alloy is less creep resistant than the non-ODS alloy, consistent with a somewhat smaller grain size resulting from grain-boundary pinning by the oxide dispersoids; (ii) at stresses above & SIM;50 MPa, dislocation creep dominates and the ODS alloy is more creep resistant, as expected from oxide dispersoids impeding dislocation motion. When tested perpendicular to the build direction, both alloys have the same creep resistance, which is however much lower than when the stress is aligned with the build direction, reflecting a strong effect of texture and grain shape. After & SIM;10% compressive creep deformation, grain structure and texture remain largely unchanged as compared to pre-creep structure.

  • Files
  • Details
  • Metrics
Type
research article
DOI
10.1016/j.addlet.2022.100069
Web of Science ID

WOS:001025417400010

Author(s)
Rakhmonov, Jovid U.
Kenel, Christoph
De Luca, Anthony
Leinenbach, Christian  
Dunand, David C.
Date Issued

2022-12-01

Publisher

ELSEVIER

Published in
Additive Manufacturing Letters
Volume

3

Article Number

100069

Subjects

Engineering, Manufacturing

•

Materials Science, Multidisciplinary

•

Engineering

•

Materials Science

•

hastelloy x

•

laser powder bed fusion

•

oxide dispersion strengthening

•

texture

•

creep

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LPMAT  
Available on Infoscience
August 14, 2023
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/199781
Logo EPFL, École polytechnique fédérale de Lausanne
  • Contact
  • infoscience@epfl.ch

  • Follow us on Facebook
  • Follow us on Instagram
  • Follow us on LinkedIn
  • Follow us on X
  • Follow us on Youtube
AccessibilityLegal noticePrivacy policyCookie settingsEnd User AgreementGet helpFeedback

Infoscience is a service managed and provided by the Library and IT Services of EPFL. © EPFL, tous droits réservés