Uneven damage on head and liner contact surfaces of a retrieved Co–Cr-based metal-on-metal hip joint bearing: An important reason for the high failure rate

Koizumi, Yuichiro; Chen, Yan; Li, Yunping; Yamanaka, Kazushi; Chiba, Akihiko; Tanaka, Shun Ichiro; Hagiwara, Yoshihiro

doi:10.1016/j.msec.2016.01.006

Cited by 16 publications

(4 citation statements)

References 44 publications

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“…UTS and 0.2% proof stress of CCM HPT ( 1709 MPa and 1528 MPa) are greater than those of CCM HF ( 1450 MPa and 1330 MPa). In addition, Vickers hardness of CCM HPT at half radius ( 503 HV) is greater than that of CCM HF ( 428 HV) reported for CCM alloy in practical use 5) . Therefore, it can be concluded that HPT processing helps to achieve greater tensile strength and hardness in CCM alloys than cold rolling and hot forging.…”

Section: Optimization Of Short Annealing Temperaturementioning

confidence: 67%

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Optimization of Microstructure and Mechanical Properties of Co–Cr–Mo Alloys by High-Pressure Torsion and Subsequent Short Annealing

et al. 2016

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The main target of this study is to optimize the microstructure and to achieve an optimization for the mechanical properties in a biomedical Co-Cr-Mo (CCM) alloy with the nominal composition of Co-28Cr-6Mo (mass%) subjected to high-pressure torsion (HPT) and subsequent short annealing. The γ → ε phase transformation and grain re nement occur in the CCM alloy subjected to HPT processing at an equivalent strain (ε eq ) of 2.25 (CCM HPT ). The HPT processing causes a decrease in the elongation due to the formation of an excessive amount of ε phase. For removal of the excessive amount of ε phases, the CCM HPT was subjected to a short annealing (CCM HPTA ). The effect of the short annealing temperature (1073 K, 1273 K, and 1473 K; annealing time was xed at 0.3 ks) on CCM HPT was investigated. In addition, the effect of the length of duration for the short annealing (0.06 ks, 0.3 ks, and 0.6 ks;) for a xed annealing temperature of 1273 K on CCM HPT was studied. CCM HPTA(1273 K) annealed for 0.3 ks shows a good optimization of mechanical properties that include high strength and large elongation owing to its ultra ne-grained microstructure, and removal of excessive ε phases.

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Section: Optimization Of Short Annealing Temperaturementioning

confidence: 67%

“…In fact, CCM alloys with small grain size have been practically used. 5) It has been reported that hot forging 6) can re ne the CCM grains from an initial size of 40 µm to 0.6 µm. 6) However, grain renement to a nano-scale is dif cult to be achieved by the conventional processing methods.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Microstructure and Mechanical Properties of Co–Cr–Mo Alloys by High-Pressure Torsion and Subsequent Short Annealing

et al. 2016

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“…Such design offers greater range of motion, reduces risk of component-to-component impingement [3,4], while providing reduced articular wear. For several decades, biomedical cobalt-chrome-molybdenum (Co-Cr-Mo) alloys are employed for this application due to their favourable properties including high strength combined with excellent corrosion and wear resistance [5][6][7]. The wear resistance of these alloys is usually attributed to increased strain hardening and formation of carbide or nitride precipitates [8,9].…”

Section: Introductionmentioning

confidence: 99%

Mechanical and phase transformation behaviour of biomedical Co-Cr-Mo alloy fabricated by direct metal laser sintering

Béreš

Silva

Sarvezuk

et al. 2018

Materials Science and Engineering: A

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“…It is a well-known fact that the size and distribution of precipitates, grain size, and the amount of hexagonal closed packed (hcp) phase meaningfully affect the wear properties of CoCr alloys. − The microstructure of CoCr alloys can be tailored via utilization of a surface modification technique, which can maintain excellent wear resistance while improving the biocompatibility of the alloy. To date, attempts to augment tribological properties of biomedical alloys have been focused on using numerous surface modifications techniques such as laser deposition of wear-resistant alloys and composites, − laser-processed compositional gradient coatings, laser-assisted oxidation, thermal oxidation, diamond-like carbon coatings, and ion implantation .…”

Section: Introductionmentioning

confidence: 99%

Titanium–Silicon on CoCr Alloy for Load-Bearing Implants Using Directed Energy Deposition-Based Additive Manufacturing

Avila

Isik

Bandyopadhyay

2020

ACS Appl. Mater. Interfaces

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Cobalt–chromium (CoCr) alloys offer outstanding wear resistance when compared to other biocompatible metallic materials and are extensively used in articulating surfaces of total hip and knee arthroplasty. However, CoCr alloys’ biocompatibility is known to be inferior to titanium (Ti). Wear- and corrosion-induced metal-ion release from CoCr alloys has been reported to cause cancer and negative physiological impacts. In this study, CoCr alloy was coated with commercially pure Ti (CpTi) and CpTi–Silicon (CoCrTi–Si) with the specific objective of reducing Co and Cr ion release during articulation, without degrading the excellent wear resistance of the CoCr alloy. Directed energy deposition (DED), a blown powder-based laser additive manufacturing technique, was utilized to process CpTi- and CpTi–Si-based coatings on Stellite 6B commercial CoCr alloy. Scanning electron microscopy (SEM), X-ray diffraction (XRD) analyses, and hardness testing found that refined carbides and titanium silicides increased the hardness from 321 ± 13 to 758 ± 48 HV0.5. Tribological studies determined a comparable wear rate between Stellite 6B alloy and CoCrTi–Si in DI water but a statistically significant reduction in Dulbecco’s Modified Eagle Medium (DMEM). The wear rates for Stellite 6B were 8.5 ± 0.8 × 10–5 and 12.9 ± 0.4 × 10–5 mm3/Nm in DI water and DMEM, respectively. While the wear rates for CoCrTi–Si were 9.1 ± 0.5 × 10–5 and 8.9 ± 0.8 × 10–5 mm3/Nm in DI water and DMEM, respectively. Contact resistance acquisition displayed the presence of a passive film formation during tribological testing. ICP-MS results for Stellite 6B and CoCrTi–Si concluded a reduction of Co ions release in DI water from 149.8 ± 66.7 to 17.5 ± 0.7 ppb and a reduction in Cr ions release from 66.7 ± 32.4 to 18.0 ± 0.5 ppb, respectively. In DMEM media, Co ion release for Stellite 6B and CoCrTi–Si reduced from 10.1 ± 1.4 to 4.1 ± 0.2 ppb and Cr ion release for Stellite 6B and CoCrTi–Si reduced from 8.7 ± 0.2 to 5.0 ± 0.7 ppb, respectively. The current study revealed a new mode of manufacturing for CoCr alloy-based load-bearing implants that can reduce toxic metal ions release due to wear- and corrosion-induced damages.

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Uneven damage on head and liner contact surfaces of a retrieved Co–Cr-based metal-on-metal hip joint bearing: An important reason for the high failure rate

Cited by 16 publications

References 44 publications

Optimization of Microstructure and Mechanical Properties of Co–Cr–Mo Alloys by High-Pressure Torsion and Subsequent Short Annealing

Optimization of Microstructure and Mechanical Properties of Co–Cr–Mo Alloys by High-Pressure Torsion and Subsequent Short Annealing

Mechanical and phase transformation behaviour of biomedical Co-Cr-Mo alloy fabricated by direct metal laser sintering

Titanium–Silicon on CoCr Alloy for Load-Bearing Implants Using Directed Energy Deposition-Based Additive Manufacturing

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