Carbide formation and dissolution in biomedical CO-CR-MO alloys with different carbon contents during solution treatment

Shingo Mineta, Shigenobu Namba, Takashi Yoneda, Kyosuke Ueda, Takayuki Narushima

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

The microstructures of as-cast and heat-treated biomedical Co-Cr-Mo (ASTM F75) alloys with four different carbon contents were investigated. The as-cast alloys were solution treated at 1473 to 1548 K for 0 to 43.2 ks. The precipitates in the matrix were electrolytically extracted from the as-cast and heat-treated alloys. An M23C6 type carbide and an intermetallic r phase (Co(Cr,Mo)) were detected as precipitates in the as-cast Co-28Cr-6Mo-0.12C alloy; an M23C6 type carbide, a r phase, an g phase (M6C-M12C type carbide), and a p phase (M2T3X type carbide with a b-manganese structure) were detected in the as-cast Co-28Cr-6Mo-0.15C alloy; and anM23C6 type carbide and an g phase were detected in the as-cast Co-28Cr-6Mo-0.25C and Co-28Cr-6Mo-0.35C alloys. After solution treatment, complete precipitate dissolution occurred in all four alloys. Under incomplete precipitate dissolution conditions, the phase and shape of precipitates depended on the heat-treatment conditions and the carbon content in the alloys. The p phase was detected in the alloys with carbon contents of 0.15, 0.25, and 0.35 mass pct after heat treatment at high temperature such as 1548 K for a short holding time of less than 1.8 ks. The presence of the p phase in the Co-Cr-Mo alloys has been revealed in this study for the first time.

Original languageEnglish
Pages (from-to)2129-2138
Number of pages10
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume41
Issue number8
DOIs
Publication statusPublished - 2010 Aug 1

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys

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