Heat treatment of cast Co-Cr-Mo for orthopaedic implant use

Dobbs, H. S.; Robertson, John L.

doi:10.1007/bf00560627

Cited by 118 publications

(59 citation statements)

References 21 publications

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“…Hot isostatic pressing (HIP) and solution treatment (ST) are commonly applied to as-cast Co-Cr to improve ductility, fatigue strength, reduce microporosity, and homogenize microstructural features [26,27]. Partial carbide dissolution improves ductility and fatigue strength, properties of particular importance in the femoral-stem component [25].The hot isostatic pressing process can vary by manufacturer and exact parameters are unknown, but generally occur near 1200°C, within the solidus temperature, and at pressures of 103MPa for a period totaling 4 hours [18,27].…”

Section: Hot-isostatic Pressingmentioning

confidence: 99%

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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Section: Hot-isostatic Pressingmentioning

confidence: 99%

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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“…[1][2][3] Cast Co-Cr-Mo alloys potentially have low ductility and fatigue strength because of the extensive existence of casting defects and coarse grains. 4) Hot forging is useful for optimizing and controlling the microstructures of these alloys. In order to develop a good-quality product without the defects such as cracks or localized shear bands, it is important to understand the plastic flow behavior and microstructural evolution during hot-forging.…”

Section: Introductionmentioning

confidence: 99%

Construction of Processing Map for Biomedical Co-29Cr-6Mo-0.23C-0.14N Alloy by Using Compression Tests

Yamashita

Matsumoto

et al. 2011

Mater. Trans.

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The high-temperature deformation behavior of Co-29Cr-6Mo-0.23C-0.14N alloy was investigated by carrying out compression tests; the tests were carried out in the temperature range of 1000-1200 C and strain rates ranging from 0.01 to 30 s À1 with a height reduction of approximately 65%. The optimum hot-working conditions were determined from the processing map based on the dynamic materials model. Dynamic recrystallization was observed to occur over the entire temperature and strain rate range. However, uniformly sized grains were formed for strain rates higher than 1 s À1 , which is considered to be the optimum hot-working condition. In addition, authors suggested that in extremely low stacking fault energy alloy, explosive and homogeneous formation of mechanical twinning should be considered to be stable state, and new processing map with more detailed description of deformation mechanism seems necessary in future.

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“…A more stable, uniform oxide layer would be expected with a more homogenous matrix (annealed alloy) than with a highly dendritic (as cast) structure. On the contrary, Dobbs et al [67] showed that heat treatment improved the mechanical properties of the alloy without loss of corrosion resistance. Similarly, Cawley et al [64] analysed mechanical properties and hardness of a CoCrMo alloy thermally treated and they found a correlation between carbide volume fraction and wear-rate but they do not observed any influence on the mechanical properties.…”

Section: Astm (American Section Of the International Association For mentioning

confidence: 98%

“…In addition, further differences are observed depending on the fabrication process: cast alloys are mainly used for knee joints while wrought alloys are used for component of simpler geometry (hip joints). Thermal treatments improve the mechanical properties of the alloy -34-providing commonly more homogeneous microstructures [64,67]. All those processes affect the overall electrochemical behaviour of the alloy [66,102].…”

Section: State Of the Artmentioning

confidence: 99%

Study of the degradation mechanisms of the CoCrMo biomedical alloy in physiological media by electrochemical techniques and surface analysis

Vidal¹

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A mis padres y a mi hermano por estar siempre ahí Agradecer esta Tesis a toda esa gente que durante estos años ha compartido grandes momentos conmigo… En primer lugar agradecérsela a mi directora, amiga y muchas de las veces hasta madre ANNA IGUAL MUÑOZ. Gracias no sólo por enseñarme todo lo que sé si no por transmitirme en todos los momentos la motivación por lo que hacemos y seguir adelante. Por ese proyecto que empezamos juntos hace tanto tiempo y del que me siento tan orgulloso. Me llevo un gran recuerdo de todos esos momentos vividos juntos (que no son pocos). Gracias por enseñarme muchas de las veces a cómo afrontar las cosas…. te deseo lo mejor, ¡te lo mereces! Al Ministerio de Educación y Ciencia por su ayuda a través del financiamiento en el proyecto PROFIT CIT 300100-2007-0049 y de la Beca Predoctoral de Formación de Personal Universitario AP2007-01243 y al Ministerio de Ciencia e Innovación por el proyecto MAT 2011-22481. Asimismo, agradecer al Ministerio por la financiación de las dos estancias en Suiza en el Institut des Matériaux de la EPFL (Lausanne) gracias a la cual la presente Tesis Doctoral opta a la mención internacional.Agradecerle también esta Tesis a mi supervisor de la estancia en Suiza, STEFANO MISCHLER. Gracias por la acogida, por la manera de pensar, por todo lo aprendido pero, sobre todo, por afrontar todo siempre con gran alegría. ¡Eres admirable! Gracias a todo el grupo IEC. Gracias a vuestra ayuda ha sido mucho más fácil llevar esto a cabo. En especial a mis compañeras con los que empecé esta aventura, VIR y LUPITA, hasta los que me habéis acompañado en el final, CÉSAR, JORDI, TEPE y RAMÓN. ¡Gracias por todos esos grandes momentos! A ISAAC, mi hermano, compañero, confidente,… con el que hace mucho tiempo empezamos y aún después de tantos años seguimos juntos. Lo peor de terminar la Tesis será separarnos, pero te deseo lo mejor en esta nueva etapa que viene. ¡Vales muchísimo! ¡Gracias por todo y mucha suerte! Al departamento de Ingeniería Química y Nuclear, en especial a mis tías ALICIA, ISABEL y MARIA de las que me llevo un gran recuerdo.Al grupo Tribology -Materials, Surfaces & Interfaces por su gran acogida y hacerme uno más desde el primer momento. ANABEL, NIKITAS, NIKOLA, NURIA, PIERRE y toda la gente extraordinaria con la que he compartido mis estancias en Suiza. A mis amigos BRAD, EDGAR, EVELINE, JAVI y LUIZ. En especial a SANDRA, por cuidarme tanto… me llevo una amiga para toda la vida. ¡Gracias por todo! Agradecer a toda mi familia, en especial a mi MADRE, PADRE y a mi hermano ALBERTO. Por todos esos momentos, por aguantarme en los mejores y en los peores momentos, por ser siempre un grandísimo apoyo, por aceptar siempre todas las decisiones que he tomado en mi vida. ¡Os admiro! Y a esa nueva incorporación, ESTEFANIA, que te tengo tanto cariño.Y por último, que no menos importante, a todo mi grupo de amigos en especial a ALBERTO, DAVID, DIANA, ELENITA, ESTEBAN, GIUSEPPE, ISA, JOSÉ, JUAN y LAURA por todos esos grandes momentos, por estar siempre tan unidos, por ser siempre s...

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Heat treatment of cast Co-Cr-Mo for orthopaedic implant use

Cited by 118 publications

References 21 publications

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

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

Construction of Processing Map for Biomedical Co-29Cr-6Mo-0.23C-0.14N Alloy by Using Compression Tests

Study of the degradation mechanisms of the CoCrMo biomedical alloy in physiological media by electrochemical techniques and surface analysis

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