Mechanical properties of forged low Ni and C-containing Co-Cr-Mo biomedical implant alloy

Akihiko Chiba, Kazushige Kumagai, Hiroe Takeda, Naoyuki Nomura

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65 Citations (Scopus)


In order to examine the influence of variation in grain size and microstructure on mechanical properties of a low Ni and C-containing Co-29Cr-6Mo alloy for biomedical implant materials, the tensile properties and the dry friction wear characteristics of the wrought Co-29Cr-6Mo alloy without addition of Ni and C were investigated. The microstructure of as-forged alloys, consisting of fee phase mixed with athermal hep martensite, is found to become finer as the reduction during forging increases. The hot-forging processes for fabricating the fine microstructure with different grain sizes of 43, 11 and 3 μm has been successfully established under the condition that forging temperature of higher than 1273 K is strictly kept during forging. The tensile properties, such as the yield stress, the tensile stress and the elongation, are improved with decreasing the grain size and thereby increasing the volume fraction of the fee phase in the microstructure. The dry wear resistance against the alumina ball is enhanced by decreasing the grain size.

Original languageEnglish
Pages (from-to)2317-2322
Number of pages6
JournalMaterials Science Forum
Issue numberIII
Publication statusPublished - 2005
EventPRICM 5: The Fifth Pacific Rim International Conference on Advanced Materials and Processing - Beijing, China
Duration: 2004 Nov 22004 Nov 5


  • Biomaterial
  • Co-Cr-Mo alloy
  • Hot-forging
  • Joint prostheses
  • Mechanical properties
  • Wear


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