Precipitates in Biomedical Co-Cr Alloys

Narushima, Takayuki; Mineta, Shingo; Kurihara, Y.; Ueda, Kyosuke

doi:10.1007/s11837-013-0567-6

Cited by 72 publications

(49 citation statements)

References 83 publications

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“…³-phase precipitates (M 2 T 3 X-type precipitate with ¢-Mn structure, where M and T are metallic elements and X is carbon or nitrogen) 13) were the main precipitate species in all the alloys. M 2 Xtype 18) and M 23 X 6 -type 12) precipitates were also detected in the alloys with and without nitrogen addition, respectively. The area percents of the precipitates were calculated using at least three OM images (500©).…”

Section: Pin-on-disk Wear Testmentioning

confidence: 90%

Mass Loss and Ion Elution of Biomedical Co–Cr–Mo Alloys during Pin-on-Disk Wear Tests

et al. 2013

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Pin-on-disk wear tests using biomedical CoCrMo alloy pins and alumina disks were conducted in Kokubo and 1% lactic acid solutions. The mass loss and elution of metallic ions were measured and the surface of the pin was observed after the wear test. Mass loss of the alloy pins in 1% lactic acid solution was 10 times higher than the mass loss in Kokubo solution. In Kokubo solution, the as-cast pins exhibited higher mass loss and higher total amount of eluted ions than solution-treated pins. The Cr and Mn ion content in Kokubo solution was lower than expected, based on the chemical composition of the alloy. The incorporation of Cr and Mn ions into the calcium phosphate detected on the wear track of disks is the possible reason for the small amount of these ions in Kokubo solution.

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Section: Pin-on-disk Wear Testmentioning

confidence: 90%

Mass Loss and Ion Elution of Biomedical Co–Cr–Mo Alloys during Pin-on-Disk Wear Tests

et al. 2013

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“…In fact, Cr 2 N and M 23 C 6 were detected in the Co-Cr-Mo alloy with the same composition in both as-EBM-built condition and after subsequent aging at 800 C for 24 h, while no σ phase was detected 18) . The formation and dissolution of precipitates in Co-Cr-Mo alloys containing carbon and nitrogen were assessed by Narushima et al 27) The absence of σ-phase agrees with the tendency that the amount of σ-phase decreases with increasing carbon content and is negligibly small for carbon content higher than 0.2 mass%, which were reported by Narushimara et al 27) Figure 7 shows the change in temperature at the center of the lower surface of the base plate during fabrication; this temperature change was measured with a thermocouple. The temperature indicates characteristic changes corresponding to each process of the fabrication, i.e.…”

Section: Resultsmentioning

confidence: 99%

Effect of Building Position on Phase Distribution in Co-Cr-Mo Alloy Additive Manufactured by Electron-Beam Melting

Takashima

Koizumi

et al. 2016

Mater. Trans.

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Cobalt-chromium-molybdenum (Co-Cr-Mo) alloys are used for biomedical implants such as arti cial joints because they have excellent wear and corrosion resistance and biocompatibility. Electron-beam melting (EBM) is a type of additive manufacturing technique for metals. We used EBM to fabricate 20 rods of a Co-Cr-Mo alloy with height of 160 mm arranged in a 4 × 5 matrix and observed the phase constitution in the middle part (at a height of 80 mm) of the rods by scanning electron microscopy-electron backscatter diffraction. We found that the rods in the center part of the matrix consisted of more of the face-centered cubic (γ) phase and less of the hexagonal close-packed (ε) phase than rods in the outer part. This happened because even though each rod was fabricated under the same beam condition, the rods at the center had been exposed to higher temperature than those in the outer part, and less thermal dissipation took place because the neighboring rods were also heated by the electron beam. This difference in the thermal histories should be taken into consideration when many objects are fabricated simultaneously.

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“…Penambahan unsur mangan adalah untuk tetap mempertahankan sifat mampu bentuk dalam paduan, menggantikan nikel karena bersifat alergi dalam tubuh manusia. Nitrogen merupakan salah satu unsur yang digunakan untuk meningkatkan mampu bentuk dan sifat mekanis dalam paduan Co-Cr-Mo [13] . Peningkatan mampu bentuk paduan karena penambahan nitrogen diakbiatkan karena pembentukan athermal ε (HCP) martensite terhambat sehingga paduan tetap dalam fasa γ (FCC) [14] .…”

Section: Pendahuluanunclassified

Pengaruh Penambahan Karbon Dan Nitrogen Terhadap Mikrostruktur, Kekuatan Tarik Dan Mampu Bentuk Paduan Co-28Cr-6Mo-0,8Si-0,8Mn-0,4Fe-0,2Ni [Influence of Additional Carbon And Nitrogen on Microstructure, Tensile Strength And Workability of Co- 28Cr-6Mo-0,8Si-0,8Mn-0,4Fe-0,2Ni]

Rokhmanto¹,

Soegijono²,

Kartika³

2017

metal.

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IntisariPaduan Co-Cr-Mo banyak digunakan sebagi material implan tulang dan gigi, dimana komposisi paduan mengacu kepada standar material implan ASTM F75. Paduan Co-Cr-Mo memiliki sifat mekanis yang baik, bersifat biokompatibilitas dan memiliki ketahanan korosi yang tinggi. Tujuan penelitian ini adalah melihat pengaruh penambahan karbon dan nitrogen terhadap kekuatan tarik dan mampu bentuk paduan Co-28Cr-6Mo-0,8Si-0,8Mn-0,4Fe-0,2Ni untuk memenuhi aplikasi di atas. Karbon ditambahkan ke dalam paduan sebesar 0,08; 0,15 dan 0,25 %berat, sedangkan nitrogen sebesar 0,2 %berat. Paduan hasil coran (as cast) kemudian dihomogenisasi pada temperatur 1200 °C selama 6 jam, lalu dilakukan prosess hot roll dengan pemanasan awal 1200 °C selama 1 jam dilanjutkan dengan quenching dalam media air. Paduan as cast maupun hasil hot roll kemudian diamati strukturnya dengan menggunakan mikroskop optik dan SEM serta dilakukan uji tarik untuk mengetahui sifat mekanik dan fraktografi patahan. Kekuatan tarik paduan Co-28Cr-6Mo-0,8Si-0,8Mn-0,4Fe-0,2Ni meningkat seiring dengan meningkatnya penambahan karbon dalam paduan, sedangkan penambahan nitrogen meningkatkan mampu bentuk paduan Co-28Cr-6Mo-0,8Si-0,8Mn-0,4Fe-0,2Ni.Kata Kunci: Paduan Co-28Cr-6Mo-0,8Si-0,8Mn-0,4Fe-0,2Ni, karbon, nitrogen, mikrostruktur, kekuatan tarik, mampu bentuk 2Ni when used Abstract Co-Cr-Mo alloys are widely used as bone and dental implant materials, where the composition of the alloy refers to the standard ASTM F75. Co-Cr-Mo alloys has good mechanical properties, biocompatibility and high corrosion resistance. Objective of this paper is to investigate the influence of Carbon and Nitrogen on tensile strength and workability of

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Precipitates in Biomedical Co-Cr Alloys

Cited by 72 publications

References 83 publications

Mass Loss and Ion Elution of Biomedical Co–Cr–Mo Alloys during Pin-on-Disk Wear Tests

Mass Loss and Ion Elution of Biomedical Co–Cr–Mo Alloys during Pin-on-Disk Wear Tests

Effect of Building Position on Phase Distribution in Co-Cr-Mo Alloy Additive Manufactured by Electron-Beam Melting

Pengaruh Penambahan Karbon Dan Nitrogen Terhadap Mikrostruktur, Kekuatan Tarik Dan Mampu Bentuk Paduan Co-28Cr-6Mo-0,8Si-0,8Mn-0,4Fe-0,2Ni [Influence of Additional Carbon And Nitrogen on Microstructure, Tensile Strength And Workability of Co- 28Cr-6Mo-0,8Si-0,8Mn-0,4Fe-0,2Ni]

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Precipitates in Biomedical Co-Cr Alloys

Cited by 72 publications

References 83 publications

Mass Loss and Ion Elution of Biomedical Co&ndash;Cr&ndash;Mo Alloys during Pin-on-Disk Wear Tests

Mass Loss and Ion Elution of Biomedical Co&ndash;Cr&ndash;Mo Alloys during Pin-on-Disk Wear Tests

Effect of Building Position on Phase Distribution in Co-Cr-Mo Alloy Additive Manufactured by Electron-Beam Melting

Pengaruh Penambahan Karbon Dan Nitrogen Terhadap Mikrostruktur, Kekuatan Tarik Dan Mampu Bentuk Paduan Co-28Cr-6Mo-0,8Si-0,8Mn-0,4Fe-0,2Ni [Influence of Additional Carbon And Nitrogen on Microstructure, Tensile Strength And Workability of Co- 28Cr-6Mo-0,8Si-0,8Mn-0,4Fe-0,2Ni]

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Mass Loss and Ion Elution of Biomedical Co–Cr–Mo Alloys during Pin-on-Disk Wear Tests

Mass Loss and Ion Elution of Biomedical Co–Cr–Mo Alloys during Pin-on-Disk Wear Tests