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Microstructures and Mechanical Properties of Biomedical Co-29Cr-6Mo-0.14N Alloys Processed by Hot Rolling

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The effect of hot rolling on the microstructural evolution and mechanical properties of biomedical Co-29Cr-6Mo-0.14N (mass pct) alloys has been investigated. The alloy strength increases with increasing hot-rolling reduction; the specimen hot rolled to 92.8 pct (equivalent strain of 3.04) exhibits a yield stress as high as 1100 MPa, which is twice that of the conventionally prepared specimens, with no significant loss in ductility. The grain size hardly changed after hot rolling to 60.0 pct, whereas a specimen hot rolled to 92.8 pct has finer grains. The hot-rolled specimens exhibit deformed microstructures with many deformation twins and dislocation boundaries. The accumulated strain increases monotonically with increasing hot-rolling reduction, although short annealing occurs on each hot-rolling pass. The strengthening mechanism in the hot-rolled Co-29Cr-6Mo-0.14N alloys is discussed by considering the dislocation and grain refinement strengthening.

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Notes

  1. In this article, all alloy compositions are expressed in mass pct.

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Acknowledgments

This research was supported by the Regional Innovation Cluster Program of the Ministry of Education, Culture, Sports, Science, and Technology (MEXT), Japan.

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Author notes

  1. Manami Mori (Graduate Student, Researcher)

    Present address: NISSAN ARC, LTD., Yokosuka, 237-0061, Japan

Authors and Affiliations

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

    Manami Mori (Graduate Student, Researcher), Kenta Yamanaka (Ph.D. Student), Shigeo Sato (Associate Professor), Kazuaki Wagatsuma (Professor) & Akihiko Chiba (Professor)

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  1. Manami Mori
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  2. Kenta Yamanaka
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  3. Shigeo Sato
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  5. Akihiko Chiba
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Corresponding author

Correspondence to Akihiko Chiba.

Additional information

Manuscript submitted August 16, 2011.

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Mori, M., Yamanaka, K., Sato, S. et al. Microstructures and Mechanical Properties of Biomedical Co-29Cr-6Mo-0.14N Alloys Processed by Hot Rolling. Metall Mater Trans A 43, 3108–3119 (2012). https://doi.org/10.1007/s11661-012-1156-y

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