Effect of building position on phase distribution in Co-Cr-Mo alloy additive manufactured by EBM

Taiyo Takashima, Yuichiro Koizumi, Yunping Li, Kenta Yamanaka, Tsuyoshi Saito, Akihiko Chiba

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


Co-Cr-Mo alloy is used for biomedical implant such as artificial joint because it has excellent wear and corrosion resistances and biocompatibility. Electron beam melting (EBM) is a type of additive manufacturing technology for metals. We fabricated 20 rods of Co-Cr-Mo alloy with height of 160 mm arranged in a 4 × 5 matrix and observed phase constitution at the middle part (80 mm in height) of the rods by SEM-EBSD. We found that the rods in the center part of the matrix had more γ-fcc phase and less ε-hcp phase than those in the outer part. This difference in the phase fraction occurred probably because the rods surrounded by other rods were held at higher temperature due to the inhibition of thermal dissipation to the surroundings. We should take into consideration this difference in the thermal history when we fabricate many objects simultaneously.

Original languageEnglish
Pages (from-to)10-16
Number of pages7
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Issue number1
Publication statusPublished - 2016 Jan


  • Co-Cr-Mo alloy
  • Electron beam melting
  • Martensitic transformation
  • Preheat
  • Tensile test

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry


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