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Precipitates in Biomedical Co-28Cr-6Mo-(0–0.41)C Alloys Heat-Treated at 1473 K to 1623 K (1200 °C to 1350 °C)

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Abstract

The phase and formation/dissolution of biomedical Co-28Cr-6Mo-xC (x = 0, 0.12, 0.16, 0.24, 0.33, and 0.41, in mass pct) alloys were investigated before and after heat treatment at high temperatures. The heat-treatment temperatures and holding periods were varied from 1473 K to 1623 K (1200 °C to 1350 °C) and from 0 ks to 43.2 ks, respectively. The intermetallic σ phase was observed in the as-cast and heat-treated alloys without added carbon. In the carbon-added alloys, the M23C6-type, π-phase (M2T3X-type carbide with a β-Mn structure), η-phase (M6C-M12C-type), and M7C3-type carbides were observed depending on the carbon content and heat-treatment conditions. A complete precipitate dissolution was achieved in the alloys with a carbon content of 0 to 0.24 mass pct. The holding time required for complete precipitate dissolution in the carbon-added alloys increased with increasing heat-treatment temperature above 1548 K (1275 °C). The formation of π-phase and M7C3-type carbides was observed in the carbon-added alloys during heat treatment at high temperatures of 1548 K to 1623 K (1275 °C to 1350 °C). Two types of π phase with different lattice constants and chemical compositions were confirmed in the alloys with carbon contents of 0.24, 0.33, and 0.41 mass pct after heat treatment at 1573 K to 1623 K (1300 °C to 1350 °C). The M7C3-type carbide observed at high temperatures occurred in a starlike precipitate with a complicated microstructure.

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Acknowledgments

The authors thank Professor Hara and Mr. Soma of Tohoku University for their useful suggestions on electrolytic extraction, and Mr. Suda for his EPMA work. The authors thank the Yoneda Advanced Casting Co., Ltd., for supplying the Co-Cr-Mo alloy ingots used in this study.

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Authors and Affiliations

  1. Department of Materials Processing, Tohoku University, Sendai, 980-8579, Japan

    Shingo Mineta (Graduate Student),  Alfirano (Graduate Student), Kyosuke Ueda (Assistant Professor) & Takayuki Narushima (Professor)

  2. Materials Research Laboratory, Kobe Steel, Ltd., Kobe, 651-2271, Japan

    Shigenobu Namba (Senior Research Metallurgist)

  3. Yoneda Advanced Casting Co., Ltd., Takaoka, 933-0951, Japan

    Takashi Yoneda (President)

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  1. Shingo Mineta
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  2. Alfirano
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  3. Shigenobu Namba
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  4. Takashi Yoneda
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  5. Kyosuke Ueda
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  6. Takayuki Narushima
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Corresponding author

Correspondence to Shingo Mineta.

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Manuscript submitted September 18, 2011.

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Mineta, S., Alfirano, Namba, S. et al. Precipitates in Biomedical Co-28Cr-6Mo-(0–0.41)C Alloys Heat-Treated at 1473 K to 1623 K (1200 °C to 1350 °C). Metall Mater Trans A 43, 3351–3358 (2012). https://doi.org/10.1007/s11661-012-1142-4

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