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Formation of the χ-Phase Precipitate in Co-28Cr-6Mo Alloys with Additional Si and C

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Abstract

The precipitates of biomedical Co-28Cr-6Mo-(0.5 to 2)Si-(0.05 to 0.35)C alloys (mass pct) have been investigated before and after heat treatment, focusing on the formation of the χ-phase precipitate. The precipitates were precisely and directly analyzed after using electrolytic extraction to separate the precipitates from the alloys. Heat treatment was performed at 1523 K (1250 °C) for a holding time of 0.6 ks. The χ-phase precipitate was detected with Si content of 1.3 to 2 mass pct and C content of 0.05 to 0.15 mass pct in both the as-cast and heat-treated alloys. The higher Si content and the mid-level C content of about 0.15 mass pct favored the formation of the χ-phase precipitate. Moreover, the χ-phase precipitate was not observed in the compositional range of the ASTM F 75 standard: Si content ≤1.0 mass pct and C content ≤0.35 mass pct. In the as-cast Co-28Cr-6Mo-1.3Si-0.15C alloy, which is outside of the ASTM F 75 standard, the content of the χ-phase precipitate was around 6 pct in area percent; the decrease in the ductility was detected in the tensile test of this alloy. The amount of precipitates decreased due to heat treatment at 1523 K (1250 °C), where the dissolution of precipitates occurred. After the heat treatment, a single χ-phase precipitate region was detected.

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Acknowledgments

This study was partially supported by a Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan and MEXT special expenditures: Innovative Research for Biosis-Abiosis Intelligent Interface.

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Authors and Affiliations

  1. Department of Materials Processing, Tohoku University, 6-6-02, Aza Aoba Aramaki, Aoba-ku, Sendai, 980-8579, Japan

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

  2. Metallurgy Engineering Department, University of Sultan Ageng Tirtayasa University, Cilegon, 42435, Indonesia

    Alfirano (Lecturer)

Authors
  1. Kei Sugawara
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  2. Alfirano
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  3. Shingo Mineta
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  5. Takayuki Narushima
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Correspondence to Takayuki Narushima.

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Manuscript submitted January 4, 2015.

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Sugawara, K., Alfirano, Mineta, S. et al. Formation of the χ-Phase Precipitate in Co-28Cr-6Mo Alloys with Additional Si and C. Metall Mater Trans A 46, 4342–4350 (2015). https://doi.org/10.1007/s11661-015-3008-z

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