Mechanical Properties of Forged Low Ni and C-Containing Co-Cr-Mo Biomedical Implant Alloy

Microstructure and corrosion behaviour in biological environments of the new forged low-Ni Co?Cr?Mo alloys

“…The Co-29Cr-6Mo (mass%) alloys with forging ratios of 50% and 88% and the Co-29Cr-8Mo alloy with a forging ratio of 88%, developed by Chiba et al [8,9], were manufactured. A conventional solutiontreated Co-29Cr-6Mo-1Ni alloy (ASTM F75-92) was used as a reference and was called ASTM alloy in this study.…”

“…In order to improve the safety of Co-Cr-Mo alloy, the low-Ni Co-29Cr- (6,8)Mo alloys were developed by Chiba et al [8,9]. The Ni content of the developed alloy is less than 0.03 mass% while the conventional Co-CrMo alloy (ASTM F-75) contains about 1 mass%.…”

Japanese research and development on metallic biomedical, dental, and healthcare materials

“…The chemical composition of the alloy is Cr-28 Mo-6 Ni-<0.01 C-0.03 -0.07 Si-<0.01 O-0.09-0.003 N-0.0006-0.0009 Co-balance. 35 The fabrication process is shown in Figure 7. The forging process is carried out in the γ region followed by rapid cooling because the γ phase is ductile and easily deformed.…”

Influence of carbon and nitrogen addition on microstructure and hot deformation behavior of biomedical Co–Cr–Mo alloy

“…According to the research by Chiba et al [8], mean grain size of approximately 3 mm could be obtained through hot forging at temperatures higher than 1273 K in the Coe29Cre6Mo alloy without adding N (hereafter referred to as the CCM alloy), and the resulting mechanical properties were greatly improved due to grain refinement. The dynamic recrystallization (DRX) behavior in this alloy was investigated in detail by Yamanaka et al [1], who found that DRX was related to the low stacking fault energy (SFE) of this alloy and the dense planar dislocation structures due to the formation of stacking faults (SF) possibly induced grain refinement.…”