Manufacturing of high-strength Ni-free Co-Cr-Mo alloy rods via cold swaging

Journal of the Mechanical Behavior of Biomedical Materials
Kenta YamanakaAkihiko Chiba

Abstract

The strengthening of biomedical metallic materials is crucial to increasing component durability in biomedical applications. In this study, we employ cold swaging as a strengthening method for Ni-free Co-Cr-Mo alloy rods and examine its effect on the resultant microstructures and mechanical properties. N is added to the alloy to improve the cold deformability, and a maximum reduction in area (r) of 42.6% is successfully obtained via cold swaging. The rod strength and ductility increase and decrease, respectively, with increasing cold-swaging reduction r. Further, the 0.2% proof stress at r=42.6% eventually reaches 1900MPa, which is superior to that obtained for the other strengthening methods proposed to date. Such significant strengthening resulting from the cold-swaging process may be derived from extremely large work hardening due to a strain-induced γ (fcc)→ε (hcp) martensitic transformation, with the resultant intersecting ε-martensite plates causing local strain accumulation at the interfaces. The lattice defects (dislocations/stacking faults) inside the ε phase also likely contribute to the overall strength. However, excessive application of strain during the cold-swaging process results in a severe loss in ductility. Th...Continue Reading

References

Mar 30, 2002·Critical Reviews in Oncology/hematology·E Denkhaus, K Salnikow
Jul 9, 2011·Spine·Justin S YangUNKNOWN Growing Spine Study Group
Jul 7, 2012·Acta Biomaterialia·Mitsuo NiinomiJunko Hieda
Sep 20, 2012·Neurosurgery·Justin S SmithUNKNOWN International Spine Study Group
Jun 19, 2013·The Spine Journal : Official Journal of the North American Spine Society·Hiroyuki Yoshihara
Nov 6, 2013·Journal of the Mechanical Behavior of Biomedical Materials·Kenta YamanakaAkihiko Chiba
Aug 16, 2015·Journal of the Mechanical Behavior of Biomedical Materials·Manami MoriAkihiko Chiba

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Citations

Aug 9, 2016·Journal of the Mechanical Behavior of Biomedical Materials·Manami MoriAkihiko Chiba
Oct 18, 2019·Journal of Biomedical Materials Research. Part B, Applied Biomaterials·Na GongAkihiko Chiba

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