Microstructural Changes During Plastic Deformation and Corrosion Properties of Biomedical Co-20Cr-15W-10Ni Alloy Heat-Treated at 873 K

Ueki, Kosuke; Ueda, Kyosuke; Nakai, Masaaki; Nakano, Takayoshi; Narushima, Takayuki

doi:10.1007/s11661-018-4597-0

Cited by 21 publications

(8 citation statements)

References 22 publications

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“…In ASTM F90 CCWN and Co-28Cr-6Mo (mass pct) alloys, it was experimentally determined that the SIMT e-phase was formed at either grain boundaries or R 3-annealing twin boundaries. [15,17,25,40] The SIMT e-phase was formed at similar sites in the 6Mn alloys in this study.…”

Section: B Effect Of Mn Addition On Ductilitysupporting

confidence: 52%

“…The detailed procedure for anodic polarization testing was reported in a previous study. [15] III. RESULTS…”

Section: Anodic Polarization Testingmentioning

confidence: 99%

“…Ueki et al [15] reported the existence of stacking faults in ASTM F90 CCWN alloys with a grain size of approximately 80 lm. Stacking faults can be obstacles to dislocation motion depending on their states.…”

Section: A Effect Of Mn Addition On Yield Stressmentioning

confidence: 99%

“…Because microstructural evolution such as grain size change, [2,7,8] precipitate formation, [5,[9][10][11][12][13] and phase transformation [14][15][16] occur in CCWN alloys during thermomechanical treatment, it is essential to understand the role of microstructural evolution in improving the mechanical properties of the alloys through microstructural control. [15,[17][18][19][20][21][22][23][24] Ueki et al [17] designed alloys that can achieve high ductility by low-temperature heat treatment (LTHT) at 873 K in addition to high strength by grain refinement via static recrystallization. Improvement of ductility by LTHT has also been reported in biomedical Co-27Cr-6Mo alloys (mass pct).…”

Section: Introductionmentioning

confidence: 99%

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Development of Low-Yield Stress Co–Cr–W–Ni Alloy by Adding 6 Mass Pct Mn for Balloon-Expandable Stents

Yanagihara

Ueki

Ueda

et al. 2021

Metall Mater Trans A

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This is the first report presenting the development of a Co–Cr–W–Ni–Mn alloy by adding 6 mass pct Mn to ASTM F90 Co–20Cr–15W–10Ni (CCWN, mass pct) alloy for use as balloon-expandable stents with an excellent balance of mechanical properties and corrosion resistance. The effects of Mn addition on the microstructures as well as the mechanical and corrosion properties were investigated after hot forging, solution treatment, swaging, and static recrystallization. The Mn-added alloy with a grain size of ~ 20 µm (recrystallization condition: 1523 K, 150 seconds) exhibited an ultimate tensile strength of 1131 MPa, 0.2 pct proof stress of 535 MPa, and plastic elongation of 66 pct. Additionally, it exhibited higher ductility and lower yield stress while maintaining high strength compared to the ASTM F90 CCWN alloy. The formation of intersecting stacking faults was suppressed by increasing the stacking fault energy (SFE) with Mn addition, resulting in a lower yield stress. The low-yield stress is effective in suppressing stent recoil. In addition, strain-induced martensitic transformation during plastic deformation was suppressed by increasing the SFE, thereby improving the ductility. The Mn-added alloys also exhibited good corrosion resistance, similar to the ASTM F90 CCWN alloy. Mn-added Co–Cr–W–Ni alloys are suitable for use as balloon-expandable stents.

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Section: B Effect Of Mn Addition On Ductilitysupporting

confidence: 52%

“…The detailed procedure for anodic polarization testing was reported in a previous study. [15] III. RESULTS…”

Section: Anodic Polarization Testingmentioning

confidence: 99%

Section: A Effect Of Mn Addition On Yield Stressmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Development of Low-Yield Stress Co–Cr–W–Ni Alloy by Adding 6 Mass Pct Mn for Balloon-Expandable Stents

Yanagihara

Ueki

Ueda

et al. 2021

Metall Mater Trans A

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“…from the following two aspects: (1) dislocation plasticity within the strain-induced HCP-martensite. Unlike the HCP-martensite reported in conventional Co-rich alloys that exhibits a brittle characteristic [20,21] , the strain-induced HCP-martensite in the present Fe 45 Mn 35 Co 10 Cr 10 HEA reveals a ratio of 1.6238 (supplemental information) which indicates a desirable propensity to undergo further plastic deformation after its nucleation. A separate in-situ SEM-based tensile experiment (supplemental information) further demonstrates the presence of slip steps within the strain-induced HCP-martensite, confirming the activation of extensive dislocation plasticity.…”

Section: A U T H O R Accepted Manuscriptmentioning

confidence: 52%

Interstitial-Free Bake Hardening Realized by Epsilon Martensite Reverse Transformation

Wei

Jiang

Taşan

2019

Metall Mater Trans A

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By investigating a metastable high-entropy alloy, we report a latent strengthening mechanism that is associated with the thermally-induced epsilon-martensite-to-austenite back-transformation. We show this reversion-assisted hardening effect can be achieved in the same time-scale and temperature range as conventional bake-hardening treatment, but leads to both improved strength and cumulative ductility. Key mechanisms are discussed considering transformation kinetics, kinematics, strengthening and ductilization modules.

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Strain-induced martensitic transformation in biomedical Co–Cr–W–Ni alloys

2020

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Microstructural Changes During Plastic Deformation and Corrosion Properties of Biomedical Co-20Cr-15W-10Ni Alloy Heat-Treated at 873 K

Cited by 21 publications

References 22 publications

Development of Low-Yield Stress Co–Cr–W–Ni Alloy by Adding 6 Mass Pct Mn for Balloon-Expandable Stents

Development of Low-Yield Stress Co–Cr–W–Ni Alloy by Adding 6 Mass Pct Mn for Balloon-Expandable Stents

Interstitial-Free Bake Hardening Realized by Epsilon Martensite Reverse Transformation

Strain-induced martensitic transformation in biomedical Co–Cr–W–Ni alloys

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