Microstructures and mechanical properties of Co-29Cr-6Mo alloy fabricated by selective laser melting process for dental applications

Atsushi Takaichi, Suyalatu, Takayuki Nakamoto, Natsuka Joko, Naoyuki Nomura, Yusuke Tsutsumi, Satoshi Migita, Hisashi Doi, Shingo Kurosu, Akihiko Chiba, Noriyuki Wakabayashi, Yoshimasa Igarashi, Takao Hanawa

Research output: Contribution to journalArticlepeer-review

264 Citations (Scopus)

Abstract

The selective laser melting (SLM) process was applied to a Co-29Cr-6Mo alloy, and its microstructure, mechanical properties, and metal elution were investigated to determine whether the fabrication process is suitable for dental applications. The microstructure was evaluated using scanning electron microscopy with energy-dispersed X-ray spectroscopy (SEM-EDS), X-ray diffractometry (XRD), and electron back-scattered diffraction pattern analysis. The mechanical properties were evaluated using a tensile test. Dense builds were obtained when the input energy of the laser scan was higher than 400Jmm-3, whereas porous builds were formed when the input energy was lower than 150Jmm-3. The microstructure obtained was unique with fine cellular dendrites in the elongated grains parallel to the building direction. The γ phase was dominant in the build and its preferential 〈001〉 orientation was confirmed along the building direction, which was clearly observed for the builds fabricated at lower input energy. Although the mechanical anisotropy was confirmed in the SLM builds due to the unique microstructure, the yield strength, UTS, and elongation were higher than those of the as-cast alloy and satisfied the type 5 criteria in ISO22764. Metal elution from the SLM build was smaller than that of the as-cast alloy, and thus, the SLM process for the Co-29Cr-6Mo alloy is a promising candidate for fabricating dental devices.

Original languageEnglish
Pages (from-to)67-76
Number of pages10
JournalJournal of the Mechanical Behavior of Biomedical Materials
Volume21
DOIs
Publication statusPublished - 2013 May
Externally publishedYes

Keywords

  • Cellular dendrite
  • Co-Cr-Mo alloy
  • Dental application
  • Microstructure
  • Preferential crystallographic orientation
  • Selective laser melting

ASJC Scopus subject areas

  • Biomaterials
  • Biomedical Engineering
  • Mechanics of Materials

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