Effect of heat treatment on microstructure and mechanical properties of Ni- And C-Free Co-Cr-Mo alloys for medical applications

Sang Hak Lee, Eiji Takahashi, Naoyuki Nomura, Akihiko Chiba

Research output: Contribution to journalArticlepeer-review

51 Citations (Scopus)

Abstract

The effect of pre-heat treatments, followed by a hot forging process, on the microstructure and strength of Co-Cr-Mo alloys was investigated. Four pre-heat treatments were conducted at 1170, 1200, 1230 and 1260°C for three different time condition: 2, 6 and 15 h and then water cooled to room temperature. Tensile tests and XRD analyses were carried out on both as-cast alloy and heat-treated alloys. The volume fraction of retained γ phase increases with increasing the heat treatment temperature, suggesting that the γ → ε martensitic transformation is suppressed by a higher temperature heat treatment. Tensile strength slightly decreases with increasing the heat treatment temperature and the heat treatment time, whereas the ductility slightly increases. The σ phase completely dissolves into matrix when the alloy is heat-treated at 1260°C for longer than 6 h.

Original languageEnglish
Pages (from-to)1790-1793
Number of pages4
JournalMaterials Transactions
Volume46
Issue number8
DOIs
Publication statusPublished - 2005 Aug
Externally publishedYes

Keywords

  • Biomaterial
  • Cobalt chromium molybdenum alloy
  • Heat treatment
  • Mechanical properties
  • Microstructure
  • Nickel carbon free

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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