Materials Transactions Online

Materials Transactions, Vol.57 No.12 (2016) pp.2041-2047
© 2016 Japan Society of Powder and Powder Metallurgy

Effect of Building Position on Phase Distribution in Co-Cr-Mo Alloy Additive Manufactured by Electron-Beam Melting

Taiyo Takashima1, 2, Yuichiro Koizumi2, Yunping Li2, Kenta Yamanaka2, Tsuyoshi Saito2 and Akihiko Chiba2

1Department of Materials Processing, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan
2Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan

Cobalt-chromium-molybdenum (Co-Cr-Mo) alloys are used for biomedical implants such as artificial joints because they have excellent wear and corrosion resistance and biocompatibility. Electron-beam melting (EBM) is a type of additive manufacturing technique for metals. We used EBM to fabricate 20 rods of a Co-Cr-Mo alloy with height of 160 mm arranged in a 4 × 5 matrix and observed the phase constitution in the middle part (at a height of 80 mm) of the rods by scanning electron microscopy-electron backscatter diffraction. We found that the rods in the center part of the matrix consisted of more of the face-centered cubic (γ) phase and less of the hexagonal close-packed (ε) phase than rods in the outer part. This happened because even though each rod was fabricated under the same beam condition, the rods at the center had been exposed to higher temperature than those in the outer part, and less thermal dissipation took place because the neighboring rods were also heated by the electron beam. This difference in the thermal histories should be taken into consideration when many objects are fabricated simultaneously.

This Paper was Originally Published in Japanese in J. Jpn. Soc. Powder Powder Metallurgy 63 (2016) 10-16. Figure 4 and Fig. 6 were changed for more clear and appropriate explanation.

[doi:10.2320/matertrans.Y-M2016826]

(Received 2016/04/19; Accepted 2016/06/24; Published 2016/11/25)

Keywords: custom-made artificial joints, biomedical cobalt-chromium-molybdenum alloy, electron-beam melting, preheat

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