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The effects of nitrogen additions to a cobalt-chromium surgical implant alloy

Part 2 Mechanical properties

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Abstract

The efficacy of adding nitrogen to a Co-Cr surgical implant alloy in order to improve tensile and fatigue properties has been investigated. Using the heat treatments described in Part 1 of this study, the tensile properties of specimens with nominally 0.14, 0.19, 0.21 and 0.33 wt% carbon were evaluated in air at room temperature. The fatigue testing consisted of a rotating beam fatigue test at room temperature in air, at a frequency of 10 Hz. The results of the mechanical tests indicated that interstitial nitrogen additions to low carbon alloys (nominally 0.14 wt % carbon) increased the yield strength while maintaining good ductility. However, this beneficial effect was not apparent for the material tested in fatigue, possibly because of the overriding influence of inherent flaws within the heat treated testpieces.

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Authors and Affiliations

  1. Department of Metallurgy and Materials Science, University of Toronto, M5S 1A4, Toronto, Canada

    A. J. Dempsey, R. M. Pilliar & G. C. Weatherly

  2. Mathematics, Physics and Computer Science Department, Ryerson Polytechnical Institute, 350 Victoria Street, M5B 2K3, Toronto, Canada

    T. Kilner

Authors
  1. A. J. Dempsey
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  2. R. M. Pilliar
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  3. G. C. Weatherly
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  4. T. Kilner
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Dempsey, A.J., Pilliar, R.M., Weatherly, G.C. et al. The effects of nitrogen additions to a cobalt-chromium surgical implant alloy. J Mater Sci 22, 575–580 (1987). https://doi.org/10.1007/BF01160771

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  • DOI: https://doi.org/10.1007/BF01160771

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