Materials Transactions Online

Materials Transactions, Vol.57 No.12 (2016) pp.2048-2053
© 2016 The Japan Institute of Metals and Materials

Changes in Microstructure of Biomedical Co-Cr-Mo Alloys during Aging at 973 to 1373 K

Kosuke Ueki1, Yuto Kurihara1, Shingo Mineta1, Alfirano2, Kyosuke Ueda1, Shigenobu Namba3, Takashi Yoneda4 and Takayuki Narushima1

1Department of Materials Processing, Tohoku University, Sendai 980-8579, Japan
2Metallurgy Engineering Department, Sultan Ageng Tirtayasa University, Cilegon, 42435, Indonesia
3Materials Research Laboratory, Kobe Steel, Ltd., Kobe 651-2271, Japan
4Yoneda Advanced Casting Co., Ltd., Takaoka 933-0951, Japan

Changes in the microstructure and hardness of biomedical Co-Cr-Mo forged alloys (Co-27Cr-6Mo-0.77Si-0.64Mn-0.17N-0.06C (mass%)) during aging were investigated with a focus on precipitation. After solution treatment at 1523 K for 1.8 ks, the alloys were subjected to aging at temperatures between 973 and 1373 K for up to 86.4 ks. η-phase (M6X-M12X type), M23X6-type and π-phase (A2T3X type) precipitates were detected after aging. The formation of π-phase precipitates was detected in alloys aged between 1023 and 1123 K for holding times ≥ 21.6 ks, with a nose temperature between 1073 and 1123 K. The presence of π-phase precipitates in the aged Co-Cr-Mo alloy is reported for the first time; N contained within the alloy is believed to contribute to formation of the π-phase. The formation of a hexagonal-close-packed Co-based metallic phase (ε-phase) was observed between 1023 and 1123 K. The Vickers hardness increased in alloys aged at 1023 and 1073 K. This increase in hardness is attributed to the presence of π-phase and ε-phase and their wide-area precipitation.

[doi:10.2320/matertrans.MI201507]

(Received 2016/04/21; Accepted 2016/07/15; Published 2016/11/25)

Keywords: cobalt-chromium alloy, precipitate, hardness, aging, microstructure, biomaterials

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