Changes in microstructure of biomedical Co-Cr-Mo-C alloys with solution treating and aging

S. Mineta, S. Namba, T. Yoneda, K. Ueda, T. Narushima

研究成果: Conference contribution

3 被引用数 (Scopus)

抄録

Microstructural changes occurring in biomedical Co-Cr-Mo alloys with three carbon levels due to solution treatment and aging were investigated. Ingots of Co-Cr-Mo alloys with three different carbon levels were prepared by vacuum furnace melting; their chemical composition was Co-28Cr-6Mo-xC (x = 0.12, 0.25 and 0.35 mass%). Precipitates were electrolytically extracted from as-cast and heat-treated alloys. An M23C6 type carbide and a σ s phase were detected as precipitates in as-cast Co-28Cr-6Mo-0.12C alloy, and an M23C6 type carbide and an η phase (M 6C-M12C type carbide) were detected in as-cast Co-28Cr-6Mo-0.25C and Co-28Cr-6Mo-0.35C alloys. Only the M23C 6 type carbide was detected during solution treatment. Complete precipitate dissolution occurred in all the three alloys after solution treatment. The holding time required for complete precipitate dissolution increased with increasing carbon content and decreasing solution treatment temperature. Complete precipitate dissolution occurred in the Co-Cr-Mo-C alloys solution treated at 1523 K for 43.2 ks; they were then subjected to aging from 873 to 1473 K for a heating time up to 44.1 ks after complete precipitate dissolution in solution treatment at 1523 K for 43.2 ks. The M 23C6 type carbide with a grain size of 0.1-3 μm was observed after aging. A time-temperature-precipitation diagram of the M 23C6 type carbide formed in the Co-28Cr-6Mo-0.25C alloy was plotted.

本文言語English
ホスト出版物のタイトルTHERMEC 2009 Supplement
ページ377-382
ページ数6
DOI
出版ステータスPublished - 2010
イベント6th International Conference on Processing and Manufacturing of Advanced Materials - THERMEC'2009 - Berlin, Germany
継続期間: 2009 8 252009 8 29

出版物シリーズ

名前Advanced Materials Research
89-91
ISSN(印刷版)1022-6680

Other

Other6th International Conference on Processing and Manufacturing of Advanced Materials - THERMEC'2009
CountryGermany
CityBerlin
Period09/8/2509/8/29

ASJC Scopus subject areas

  • Engineering(all)

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