Fatigue improvement of electron beam melting-fabricated biomedical Co–Cr–Mo alloy by accessible heat treatment

Daixiu Wei, Yuichiro Koizumi, Taiyo Takashima, Makoto Nagasako, Akihiko Chiba

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

We significantly improved the fatigue properties of an electron beam melting (EBM)-fabricated biomedical Co–Cr–Mo alloy by a simple post-production heat treatment without any deformation process. The fatigue properties were improved by transforming the as-EBM-fabricated dual-phase structure (containing both the ϵ-hcp and γ-fcc phases) into the dominant ϵ-hcp phase structure, and they were further improved significantly by reverse transforming it into the dominant grain-refined γ-fcc phase structure at certain ageing conditions. It provides an accessible avenue for improving the mechanical properties of additive-manufactured metallic components. (Figure presented.) IMPACT STATEMENT: The fatigue properties of additive-manufactured biomedical Co–Cr–Mo alloy were significantly improved though manipulating the fatigue behaviors, which was achieved by an accessible postproduction heat treatment.

Original languageEnglish
Pages (from-to)93-99
Number of pages7
JournalMaterials Research Letters
Volume6
Issue number1
DOIs
Publication statusPublished - 2018 Jan 2

Keywords

  • Cobalt chromium alloy
  • Electron beam melting
  • Fatigue
  • Heat treatment

ASJC Scopus subject areas

  • Materials Science(all)

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