Effect of treatment mode on microstructure evolution and mechanical properties of nickel-based superalloy fabricated by selective laser melting

Tianyi Hu, Rui Sun, Wei Li*, Tatsuo Sakai, Muhammad Imran Lashari, Ping Wang*, Usama Hamid

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)
Plum Print visual indicator of research metrics
  • Citations
    • Citation Indexes: 9
  • Captures
    • Readers: 10
see details

Abstract

Combined with scanning electron microscopy, transmission electron microscope, X-ray diffraction and electron backscatter diffraction, the effects of three treatment modes consisting of as-deposited, solid solution and solution aging state on mechanical structure-properties of a nickel-based superalloy fabricated by selective laser melting were studied. Grains have preferred orientation, i.e. strong texture along {100}. The phase transformation processes during post-heat treatments include dissolution of Laves phase, precipitation of strengthening phases γ′, γ′′ and δ, and size reduction of δ phase. Especially for solution aging treatment, the refined grains, high dislocation density and added high-angle grain boundaries cause a significant increase in strength and a decrease in ductility, which is consistent with the results of the tensile tests. The interior cracking behavior related to the micro-voids and microcracks formed by dislocation pile-ups and uncoordinated deformation around harder δ phase in a vacuum environment becomes a typical ductile failure mode.

Original languageEnglish
Article number110924
JournalVacuum
Volume199
DOIs
Publication statusPublished - May 2022

Keywords

  • Failure modeling
  • Mechanical property
  • Microstructure evolution
  • Nickel-based superalloy
  • Selective laser melting
  • Treatment mode

Fingerprint

Dive into the research topics of 'Effect of treatment mode on microstructure evolution and mechanical properties of nickel-based superalloy fabricated by selective laser melting'. Together they form a unique fingerprint.

Cite this

Hu, T., Sun, R., Li, W., Sakai, T., Lashari, M. I., Wang, P., & Hamid, U. (2022). Effect of treatment mode on microstructure evolution and mechanical properties of nickel-based superalloy fabricated by selective laser melting. Vacuum, 199, Article 110924. https://doi.org/10.1016/j.vacuum.2022.110924