Precipitation path of secondary phases during solidification of the Co–25.5%Cr–5.5%Mo–0.26%C alloy

Ramı́rez, L.E; Castro, Mickaël; Méndez, Manuel A.; Lacaze, Jacques; Herrera, M.; Lesoult, G.

doi:10.1016/s1359-6462(02)00305-6

Cited by 68 publications

(30 citation statements)

References 7 publications

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“…Ramı´rez et al reported that the r phase reacted with the solute carbon to form M 23 C 6 type and M 12 C type carbides during the solidification of Co-Cr-Mo-C alloys. [18] The M 12 C type carbide was reported to transform into the M 23 C 6 type carbide during the cooling of the as-cast Co-Cr-Mo-C alloys. [18] In this study, the XRD analysis of the precipitates that were electrolytically extracted from the as-cast alloys revealed the presence of the g phase in the C15, C25, and C35 alloys.…”

Section: Discussionmentioning

confidence: 99%

“…[18] The M 12 C type carbide was reported to transform into the M 23 C 6 type carbide during the cooling of the as-cast Co-Cr-Mo-C alloys. [18] In this study, the XRD analysis of the precipitates that were electrolytically extracted from the as-cast alloys revealed the presence of the g phase in the C15, C25, and C35 alloys. This result is attributed to the cooling rate of solidification for the cast employed in this study.…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, the behavior of carbides formed in Co-Cr-Mo alloys during heat treatment has been investigated in some studies. [8][9][10][11][12][13][14][15][16][17][18] Several studies have focused on investigating the dissolution behavior of carbides during solution treatment. [8][9][10][11][12][13][14][15][16] Although the precipitation or dissolution behavior of carbides is essential knowledge to establish an effective and low-cost manufacturing process for Co-Cr-Mo alloys, a systematic explanation of the behavior of carbides during solution treatment has not been reported thus far.…”

Section: Introductionmentioning

confidence: 99%

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Carbide Formation and Dissolution in Biomedical Co-Cr-Mo Alloys with Different Carbon Contents during Solution Treatment

Mineta

Namba

Yoneda³

et al. 2010

Metall Mater Trans A

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SHINGO MINETA, SHIGENOBU NAMBA, TAKASHI YONEDA, KYOSUKE UEDA, and TAKAYUKI NARUSHIMA The microstructures of as-cast and heat-treated biomedical Co-Cr-Mo (ASTM F75) alloys with four different carbon contents were investigated. The as-cast alloys were solution treated at 1473 to 1548 K for 0 to 43.2 ks. The precipitates in the matrix were electrolytically extracted from the as-cast and heat-treated alloys. An M 23 C 6 type carbide and an intermetallic r phase (Co(Cr,Mo)) were detected as precipitates in the as-cast Co-28Cr-6Mo-0.12C alloy; an M 23 C 6 type carbide, a r phase, an g phase (M 6 C-M 12 C type carbide), and a p phase (M 2 T 3 X type carbide with a b-manganese structure) were detected in the as-cast Co-28Cr-6Mo-0.15C alloy; and an M 23 C 6 type carbide and an g phase were detected in the as-cast Co-28Cr-6Mo-0.25C and Co-28Cr-6Mo-0.35C alloys. After solution treatment, complete precipitate dissolution occurred in all four alloys. Under incomplete precipitate dissolution conditions, the phase and shape of precipitates depended on the heat-treatment conditions and the carbon content in the alloys. The p phase was detected in the alloys with carbon contents of 0.15, 0.25, and 0.35 mass pct after heat treatment at high temperature such as 1548 K for a short holding time of less than 1.8 ks. The presence of the p phase in the Co-Cr-Mo alloys has been revealed in this study for the first time.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Carbide Formation and Dissolution in Biomedical Co-Cr-Mo Alloys with Different Carbon Contents during Solution Treatment

Mineta

Namba

Yoneda³

et al. 2010

Metall Mater Trans A

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“…and M7C3 carbides [20][21][22][23]. The resulting microstructure is a coarse dendritic structure as seen in Figure 2.2 and 2.3. represents the primary strengthening mechanism in the as-cast state [24].…”

Section: Research Objectives Summarymentioning

confidence: 94%

In-Vivo Corrosion and Fretting of Modular TI-6AL-4V/CO-CR-MO Hip Prostheses: The Influence of Microstructure and Design Parameters

González¹,

Luís²

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The purpose of this study was to evaluate the incidence of corrosion and fretting in 48 retrieved titanium-6aluminum-4vanadium and/or cobalt-chromium-molybdenum modular total hip prosthesis with respect to alloy material microstructure and design parameters. The results revealed vastly different performance results for the wide array of microstructures examined. Severe corrosion/fretting was seen in 100% of as-cast, 24% of low carbon wrought, 9% of high carbon wrought and 5% of solution heat treated cobaltchrome. Severe corrosion/fretting was observed in 60% of Ti-6Al-4V components.Design features which allow for fluid entry and stagnation, amplification of contact pressure and/or increased micromotion were also shown to play a role. 75% of prosthesis with high femoral head-trunnion offset exhibited poor performance compared to 15% with a low offset. Large femoral heads (>32mm) did not exhibit poor corrosion or fretting. Implantation time was not sufficient to cause poor performance; 54% of prosthesis with greater than 10 years in-vivo demonstrated none or mild corrosion/fretting. v Effect of heat treatments on Ti-6Al-4V microstructure. Effect of heat treatments on Ti-6Al-4V mechanical propertiesFracture toughness values for equiaxed and highly transformed microstructuresTi-6Al-4V ASTM mechanical and compositional requirements Summary of modular total hip prosthesis retrieval studies during the past 25 years. As-received prostheses catalogingGeneral prostheses feature cataloging Macroscopic Examination. Overall implant examination, i.e. non-surface specific. Porous Surface Coating TypesFemoral head and femoral stem dimensional variables Modular junction dimensional variablesCorrosion and Fretting Scoring Criteria Worst fretting or corrosion score distribution by moment arm length.Worst fretting/corrosion score distribution for either head or trunnion by implantation time in-vivo. Cobalt-Carbon phase diagram illustrating the lever rule principle that dictates the fraction AB/AC of the constituent phases which will be liquid at the sintering temperature AC. i.e. an increase in carbon content will decrease the temperature required for adhering porous coatings.Porous coated as-cast cobalt-chrome stem Effect of Cooling Rates and Highest Temperature on Ti-6Al-4V Microstructure Finite element analysis predicting greater wear at the trunnion surface as femoral head is increased from 32mm to 56mm.Material, contact conditions and environmental variables governing potential for fretting wear.Pitting corrosion phenomena and associated reactions and surface features. Ion channeling contrast enhanced image of taper subsurface at 6,000X magnification, revealing differences in morphology near the surface.FIB trench subsurface regions selected for energy dispersive spectroscopy analysis.Cobalt, chromium, and molybdenum elemental weight percent at different depths as determined by EDS.(Left to right) 1. FIB sample pull out of as-cast carbide in matrix. 2. Areas from which EDS and TEM diffraction patterns were taken. 3. TEM im...

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“…Replacing tungsten by an equal amount of molybdenum improves the ductility, increases the solidification range and changes the morphology of the precipitates by segregation [7]. Therefore, the aim of the present study is investigate the effect of the different palladium amount addition on the microhardness behaviour for the CoCrMo biomedical alloys.…”

Section: Introductionmentioning

confidence: 99%

Influence of Pd Addition of CoCrMo Biomedical Alloys on the Microhardness Behaviour

2015

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CoCrMo alloys are often used as the material for metal artificial joint because of their high corrosion resistance and mechanical properties. In this study CoCrMo alloys having different palladium amount of produced by investment casting method. Scanning electron microscopy, X-ray diffraction method and indentation tests were used to examine the mechanical properties of the alloys. Indentation experiments were carried out using Vickers indenter that the loads range from 0.245 to 9.8 N. The alloys exhibit significant load-dependence (i.e., indentation size effect). Meyer's law, proportional specimen resistance model, and Hays-Kendall model were used to analyze the load dependence of the hardness. As a results for load-independent determination of the CoCrMo alloys, the Hays-Kendall model is found to be more effective than the proportional specimen resistance model and microhardness values decreases with increase of the Pd content.

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Precipitation path of secondary phases during solidification of the Co–25.5%Cr–5.5%Mo–0.26%C alloy

Cited by 68 publications

References 7 publications

Carbide Formation and Dissolution in Biomedical Co-Cr-Mo Alloys with Different Carbon Contents during Solution Treatment

Carbide Formation and Dissolution in Biomedical Co-Cr-Mo Alloys with Different Carbon Contents during Solution Treatment

In-Vivo Corrosion and Fretting of Modular TI-6AL-4V/CO-CR-MO Hip Prostheses: The Influence of Microstructure and Design Parameters

Influence of Pd Addition of CoCrMo Biomedical Alloys on the Microhardness Behaviour

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