Effect of carbon on the microstructure, mechanical properties and metal ion release of Ni-free Co–Cr–Mo alloys containing nitrogen

Mori, M.; Yamanaka, Kazushi; Kuramoto, Kei; Ohmura, Kazuyo; Ashino, Takashi; Chiba, Akihiko

doi:10.1016/j.msec.2015.05.058

Cited by 25 publications

(8 citation statements)

References 34 publications

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“…8a), which is beneficial to the application of the alloys in clasps. Similar results have been reported for Co−29Cr−6Mo−0.2N−(0.05−0.24)C alloys [33]. As mentioned above, increasing the bulk carbon concentration leads to a decrease in grain size, solute segregation at grain boundaries, and carbide precipitation.…”

Section: Effects Of Carbon Concentration On Mechanical Propertiessupporting

confidence: 88%

“…This was accompanied by reduced amounts of Co. These results are consistent with those of previous studies on Co−Cr−Mo alloys[33,[35][36][37]. Such Cr enrichment and passivation must result in good corrosion resistance of the alloys investigated.…”

supporting

confidence: 91%

“…Co-29Cr-6 Mo−0.2N-C alloys [33] with various carbon concentrations are shown for comparison 3 . The minimum requirements of the ISO 22674 type 5 and ASTM F1537 standards are also shown.…”

Section: Significance Of the Present Strategymentioning

confidence: 99%

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Developing high strength and ductility in biomedical Co–Cr cast alloys by simultaneous doping with nitrogen and carbon

2016

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The present study suggested a novel alloy design concept for realizing high-strength Co-Cr-based cast alloys. The proposed strategy is beneficial from the practical point of view because it uses conventional casting approach-a simpler, more cost-effective, industrially friendly manufacturing process than other manufacturing processes such as thermomechanical processing or powder metallurgy. The developed alloys showed the excellent strength-ductility balance and significantly high strength comparable to that of wrought Co-Cr-Mo alloys, while maintaining acceptable ductility and good corrosion resistance. We described the relationship between microstructures and mechanical and corrosion prosperities of the developed alloys; this provides the fundamental aspect of the proposed strategy and will be helpful for further investigations or industrial realization of the proposed strategy.

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Section: Effects Of Carbon Concentration On Mechanical Propertiessupporting

confidence: 88%

supporting

confidence: 91%

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Developing high strength and ductility in biomedical Co–Cr cast alloys by simultaneous doping with nitrogen and carbon

2016

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“…7b, c, respectively). Previously, the dissolution of cobalt has been observed in the passivation process of Co-Cr-based alloys [53][54][55][56] . Further, Fig.…”

Section: Surface Chemistrymentioning

confidence: 99%

Corrosion mechanism of an equimolar AlCoCrFeNi high-entropy alloy additively manufactured by electron beam melting

et al. 2020

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High-entropy alloys (HEAs) have emerged as a class of structural alloys with various attractive properties, and their application in additive manufacturing, which enables unprecedented thermal history and geometrical complexity, is promising for realising advanced materials. This study investigates the corrosion behaviour and passive film characteristics of an equimolar AlCoCrFeNi HEA additively manufactured by electron beam melting (EBM). Potentiodynamic polarisation in a 3.5 wt% NaCl solution revealed that the bottom part of the EBM specimen shows better corrosion performance than a conventionally prepared cast specimen in terms of both corrosion and passivation current density, while a continuous increase in the current density without any apparent passivity was observed during the anodic polarisation of the top part. The electrochemical impedance spectroscopic study indicated significant differences in the passive film characteristics between the specimens, and revealed an enhanced chargetransfer resistance and the formation of a more protective passive film of the bottom part. The elemental redistribution, in particular, the enrichment of Cr in the B2 phase during the post-melt high-temperature exposure of the alloy during EBM, was responsible for the improved stability of the passive film, retarding the selective dissolution of the B2 phase in the bottom part. These findings indicate that the microstructural evolution caused by 'in situ annealing' during the EBM process significantly influences the corrosion behaviour of the HEA.

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“…Secondly, the precipitation of chromium carbides and nitrides could increase the corrosion susceptibility as a consequence of chromium depleted film while interstitials carbon and nitrogen can improve corrosion resistance. Yamanaka et al (Yamanka, 2013 found that the strength of hot rolled CoCr6Mo alloys monotonically increases when increasing nitrogen or carbon (Lee, 20026;Mori, 2015), but increasing the carbon also reduces the elongation-to-failure value and corrosion resistance. Valero Vidal et al (Valero-Vidal, 2013) recommended lower percentages of carbon and homogenization heat treatments to form the oxide film and improve the corrosion resistance of as-cast Co-Cr-Mo alloys in a simulated body fluid.…”

Section: Introductionmentioning

confidence: 99%

Role of carbon and nitrogen in the improvement of corrosion resistance of new powder metallurgy Co-Cr-Mo alloys

et al. 2020

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AbstractMicrostructural changes that result in relevant improvements in mechanical properties and electrochemical behavior can be induced using different sintering conditions of ASTM F75 cobalt alloys during their processing using powder metallurgy technique. It has been observed that the increase in carbon and nitrogen content improves corrosion resistance and mechanical properties as long as the precipitation of carbides and nitrides is avoided, thanks to the use of rapid cooling in water after the sintering stage. In addition, the reduction of the particle size of the powder improves hardness and resistance to corrosion in both acid medium with chlorides and phosphate-buffered medium that simulates the physiological conditions for its use as a biomaterial. These results lead to increased knowledge of the role of carbon and nitrogen content in the behavior displayed by the different alloys studied.

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Effect of carbon on the microstructure, mechanical properties and metal ion release of Ni-free Co–Cr–Mo alloys containing nitrogen

Cited by 25 publications

References 34 publications

Developing high strength and ductility in biomedical Co–Cr cast alloys by simultaneous doping with nitrogen and carbon

Developing high strength and ductility in biomedical Co–Cr cast alloys by simultaneous doping with nitrogen and carbon

Corrosion mechanism of an equimolar AlCoCrFeNi high-entropy alloy additively manufactured by electron beam melting

Role of carbon and nitrogen in the improvement of corrosion resistance of new powder metallurgy Co-Cr-Mo alloys

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