Effect of nitrogen addition on isothermal phase transformation and mechanical properties in biomedical Co-Cr-Mo alloys

Shingo Kurosu, Hiroaki Matsumoto, Akihiko Chiba

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Effect of nitrogen addition on isothermal phase transformation behavior in a biomedical Co-Cr-Mo alloy without addition of carbon was investigated during aging at temperature between 973 K and 1273 K for up to 90 ks. In the Co-Cr-Mo alloy, phase transformation from fcc to hcp1 with super-saturation of Cr occurred by massive transformation. With prolonged aging treatment, a lamellar structure consisting of hcp2 with equilibrium of Cr and σ phases was formed at hcp1/hcp1 boundaries by a discontinuous/cellular reaction, expressed by the reaction equation hcp 1→hcp2+σ. The phase transformation is remarkably changed by addition of nitrogen. In the Co-Cr-Mo-N alloy, the phase transformation from fcc to hcp occurs with a significant long incubation period compared with that in Co-Cr-Mo alloy. Besides, lamellar M2N(M=Cr, Mo, Co) precipitates during phase transformation, suggesting that phase transformation of Co-Cr-Mo-N alloy may be dominant by the eutectoid transformation (fcc→hcp+M2N).

Original languageEnglish
Title of host publicationTMS 2010 - 139th Annual Meeting and Exhibition - Supplemental Proceedings
Pages707-714
Number of pages8
Publication statusPublished - 2010 May 21
EventTMS 2010 - 139th Annual Meeting and Exhibition - Seattle, WA, United States
Duration: 2010 Feb 142010 Feb 18

Publication series

NameTMS Annual Meeting
Volume3

Other

OtherTMS 2010 - 139th Annual Meeting and Exhibition
CountryUnited States
CitySeattle, WA
Period10/2/1410/2/18

Keywords

  • Biomaterial
  • Cobalt-chromium-molybdenum alloy
  • Mechanical properties
  • Phase transformation

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys

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