Heat treatment of ASTM F75 Co-Cr-Mo-C-Si-Mn alloys

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

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

9 Citations (Scopus)


In this study, the carbide dissolution and formation of biomedical Co-28Cr-6Mo-0.25C-1Si (1Si) and Co-28Cr-6Mo-0.25C-1Mn (1Mn) alloys occurring during solution treatment and aging were investigated. The addition of Si or Mn markedly affected the behavior of precipitates during heat treatment. The alloy with added Si required a longer solution treatment time for complete precipitate dissolution as compared to the alloy with added Mn. Blocky M23C 6-type carbide was observed during solution treatment at 1448-1523 K. Starlike precipitates were observed in the 1Si and 1Mn alloys at 1523-1548 K and 1523 K, respectively. The starlike precipitates exhibited two types of morphologies: dense and stripe patterned. The starlike precipitates with dense and stripe-patterned appearances were a π-phase and M23C 6-type carbide + metallic γ-phase, respectively. An M 23C6-type carbide and an η-phase were formed during the aging of both the 1Si and the 1Mn alloys. In addition, an intermetallic σ-phase was detected during the aging of the 1Si alloy at 1373 K.

Original languageEnglish
Title of host publicationPRICM7
PublisherTrans Tech Publications Ltd
Number of pages4
ISBN (Print)0878492550, 9780878492558
Publication statusPublished - 2010
Event7th Pacific Rim International Conference on Advanced Materials and Processing, PRICM-7 - Cairns, QLD, Australia
Duration: 2010 Aug 22010 Aug 6

Publication series

NameMaterials Science Forum
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752


Conference7th Pacific Rim International Conference on Advanced Materials and Processing, PRICM-7
CityCairns, QLD


  • Aging
  • Carbide
  • Co-Cr-Mo alloy
  • Precipitation
  • Solution treatment


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