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Ultrafine Grain Refinement of Biomedical Co-29Cr-6Mo Alloy during Conventional Hot-Compression Deformation

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Abstract

In order to examine the microstructural evolution during hot-compression deformation of the biomedical Co-29Cr-6Mo (weight percent) alloy without the addition of Ni, hot-compression tests have been conducted at deformation temperatures ranging from 1050 °C to 1200 °C at various strain rates of 10−3 to 10 s−1. The grain refinement due to dynamic recrystallization (DRX) was identified under all deformation conditions by means of field-emission scanning electron microscopy/electron backscattered diffraction (FESEM/EBSD) and transmission electron microscopy (TEM) observations. Although the DRX grain size (d) of the deformed specimens considerably decreased with an increasing Zener–Hollomon (Z) parameter at strain rates ranging from 10−3 to 0.1 s−1, a grain size coarser than that predicted from the d-Z relation was obtained at strain rates of 1.0 and 10 s−1. An ultrafine-grained microstructure with a grain size of approximately 0.6 μm was obtained under deformation at 1050 °C at 0.1 s−1, from an initial grain size of 40 μm. The grain refinement to a submicron scale of biomedical Co-Cr-Mo alloys has been achieved with hot deformation by ~60 pct due to DRX, in which the bulging mechanism is not operative. The ultrafine grains obtained due to DRX without bulging is closely related to the considerably low stacking-fault energy (SFE) of the Co-Cr-Mo alloy at deformation temperatures.

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  2. JEOL is a trademark of Japan Electron Optics Ltd., Tokyo.

  3. Gatan is a trademark of Gatan, Inc., Warrendale, PA

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Acknowledgment

This research was supported by the Cooperation of Innovative Technology and Advanced Research in Evolutional Area under the Ministry of Education, Culture, Sports, Science and Technology (Tokyo, Japan).

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Author notes

  1. Kenta Yamanaka (Graduate Student)

    Present address: Kobe Steel, Ltd., Kobe, 651-8585, Japan

  2. Manami Mori (Graduate Student)

    Present address: Nissan Arc, Ltd., Yokosuka, 237-0061, Japan

Authors and Affiliations

  1. Department of Materials Processing, Graduate School of Engineering, Tohoku University, Sendai, 980-8577, Japan

    Kenta Yamanaka (Graduate Student) & Manami Mori (Graduate Student)

  2. Institute for Materials Research, Tohoku University, Sendai, 980-8577, Japan

    Shingo Kurosu (Postdoctoral Student), Hiroaki Matsumoto (Assistant Professor) & Akihiko Chiba (Professor)

Authors
  1. Kenta Yamanaka
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  2. Manami Mori
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  3. Shingo Kurosu
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  4. Hiroaki Matsumoto
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  5. Akihiko Chiba
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Corresponding author

Correspondence to Akihiko Chiba.

Additional information

Manuscript submitted January 30, 2009.

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Yamanaka, K., Mori, M., Kurosu, S. et al. Ultrafine Grain Refinement of Biomedical Co-29Cr-6Mo Alloy during Conventional Hot-Compression Deformation. Metall Mater Trans A 40, 1980–1994 (2009). https://doi.org/10.1007/s11661-009-9879-0

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