Improvement of mechanical properties of Co–Cr–W–Ni alloy tube suitable for balloon-expandable stent applications through heat treatment

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

doi:10.1016/j.msea.2022.144505

Cited by 5 publications

(5 citation statements)

References 24 publications

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“…The direction of the layer is roughly the same as the direction of ultrasonic rolling in streamline distribution. Additionally, a large number of particles on the surface of the specimen are deformed and refined to form the rheological hardened layer of a certain thickness, which can improve the hardness, wear resistance and corrosion resistance of the material surface, and can also improve the fatigue resistance of the material [23][24][25].…”

Section: Microstructuresmentioning

confidence: 99%

Improvement of the Mechanical Properties of 30CrNi2MoVA through Ultrasonic-Milling in Certain Key Components

Liu,

Shen,

Wang

et al. 2023

Coatings

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To improve the fatigue life of the key component and the surface properties of the 30CrNi2MoVA steel material, advanced ultrasonic-milling composite superficial treatment was performed. The microstructure, surface roughness, friction and wear performance, surface hardness, fatigue life and environmental experiments of the steel with and without ultrasonic-milling have been carried out in detail. In comparison with those of the traditional dry cutting, the results show that the surface roughness of the samples after the advanced ultrasonic-milling surface modification fluctuates about 0.32 μm, and the surface hardness is increased by about 40% compared with the matrix hardness, and the fatigue life of the pump head connection shaft has been increased by more than 11 times. Advanced ultrasonic-milling surface modification technology can increase the local residual compressive stress and wear resistance on the material surface, which can make the material have better surface properties.

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Section: Microstructuresmentioning

confidence: 99%

Improvement of the Mechanical Properties of 30CrNi2MoVA through Ultrasonic-Milling in Certain Key Components

Liu,

Shen,

Wang

et al. 2023

Coatings

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Section: Introductionmentioning

confidence: 99%

“…Li et al (2022) reported the microstructure, the mechanical properties as well as the oxide strengthening mechanisms of an selective laser melting processed Co28Cr9W1.5Si (Wt.%) alloy. Takeda et al (2023) improved the mechanical properties by microstructure control in Co–20Cr–15W–10Ni alloy tubes. Li et al (2020) prepared 1Cr11Co3W3NiMoVNbNB and investigated fracture surfaces and the microvoids as well as the microstructure-anisotropy mechanical properties relationship.…”

Section: Introductionmentioning

confidence: 99%

Research on liquid nitrogen cryogenic milling of 11Cr-3Co-3W martensitic heat-resistant steel

Lü

Deng

Tang

et al. 2023

ILT

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Purpose When processing 11Cr-3Co-3W martensitic heat-resistant steel, the traditional pouring cooling method often appears large cutting force, high cutting temperature, serious tool wear and poor surface quality. This paper aims to use new cooling methods for processing this problem. Design/methodology/approach Different performance indicators such as cutting force, tool wear and surface quality were measured and analysed under different continuous milling times. The relationship between liquid nitrogen flow and cutting force and surface roughness was analysed and measured. Findings The results show that with the increase of liquid nitrogen flow, the cutting force decreases, especially the Fx component, which decreases by 10%. When the liquid nitrogen flow reaches 8 L/min, the effect of increasing the liquid nitrogen flow on reducing the cutting force becomes smaller. The cutting force reduced by up to 15%, and the tool life increased up to 20% using liquid nitrogen cryogenic cooling than in cutting liquids cooling. When minimal quantities of lubricant (MQL) was added, the cutting force was reduced by 23%, and the tool life increased by 25%. When the cutting speed increases from 100 m/min to 250 m/min, the cutting force with cutting liquid cooling does not change significantly while the cutting force with liquid nitrogen cooling decreases with the cutting speed increasing. It shows that liquid nitrogen cooling is more suitable for high-speed machining. After the cutting length reaches 66 m, the surface roughness of the workpiece using liquid nitrogen cooling method larger than that of the cutting liquid cooling method. When MQL is added into liquid nitrogen, the lubrication performance is improved, and the surface roughness of the workpiece is reduced about 8%. Originality/value Many studies had focused on the improvement of tool life and surface quality by different cooling methods, or on the injection process and chip mechanism. However, there are few relevant studies on the variation of cooling and lubrication properties with the change of cutting length in liquid nitrogen cryogenic processing. In this research, different performance indicators such as cutting force, tool wear and surface quality were measured and analysed under different continuous milling times. The relationship between liquid nitrogen flow and cutting force and surface roughness was analysed and measured. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-03-2023-0053/

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“…Therefore, to develop next-generation small-diameter stents, a material that possesses sufficient corrosion resistance and achieves high strength and ductility while maintaining low yield stress, i.e., an alloy with excellent work-hardening properties, is required. In our previous studies, we achieved both high strength and ductility in CCWN alloys by optimizing their thermomechanical treatment process [3][4][5]. We discovered that CCWN alloys with grain sizes of 10-20 m demonstrate excellent strength-ductility balance upon heat treatment at a relatively low temperature of 873 K [3].…”

Section: Introductionmentioning

confidence: 99%

“…We discovered that CCWN alloys with grain sizes of 10-20 m demonstrate excellent strength-ductility balance upon heat treatment at a relatively low temperature of 873 K [3]. To apply this heat treatment process to practical stents, we optimized the heat treatment process for CCWN alloy tubes and successfully produced a CCWN alloy tube that exhibited mechanical properties suitable for balloon-expandable stents [5]. However, microstructure control via thermomechanical treatment increases the 0.2% proof stress and ultimate tensile strength.…”

Section: Introductionmentioning

confidence: 99%

Improvement of Work-Hardening Behavior of Co-Cr-W-Ni Alloy by Adding Mn/Fe for Balloon-Expandable Stents

Ueki,

Ueda,

Nakai

et al. 2023

KEM

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The Co-20Cr-15W-10Ni (CCWN, mass%) alloy, registered as American society of testing and materials (ASTM) F90, has been widely used as a balloon-expandable stent because of its excellent balance between its mechanical properties and corrosion resistance. To realize a less invasive stent placement, the stent diameter must be reduced, which implies that the stent strut thickness must be reduced. As such, the CCWN alloy must be high in strength and ductility while maintaining a low yield stress to facilitate the expansion and suppression of stent recoil. In this study, we focus on the effects of the adding Mn/Fe on the microstructure, mechanical properties, and corrosive properties of CCWN alloys. A 6 mass% Mn-added CCWN alloy with a grain size of approximately 20 μm prepared in this study exhibits excellent balance between tensile strength and ductility. In addition, it exhibits a lower yield stress while maintaining a high tensile strength compared with the ASTM F90 alloy. Meanwhile, a 6 mass% Fe-added CCWN alloy exhibits a higher ductility compared with the ASTM F90 alloy. The addition of Mn or Fe to the CCWN alloy increases the stacking fault energy of the alloy and suppresses strain-induced martensitic transformation during plastic deformation, thus improving the ductility of the alloy. Results of polarization tests show that the 6 mass% Mn-or Fe-added CCWN alloys exhibit the same corrosion current density as the ASTM F90 alloy. Mn-added Co-Cr-W-Ni alloys are suitable for use in balloon-expandable stents.

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Improvement of mechanical properties of Co–Cr–W–Ni alloy tube suitable for balloon-expandable stent applications through heat treatment

Cited by 5 publications

References 24 publications

Improvement of the Mechanical Properties of 30CrNi2MoVA through Ultrasonic-Milling in Certain Key Components

Improvement of the Mechanical Properties of 30CrNi2MoVA through Ultrasonic-Milling in Certain Key Components

Research on liquid nitrogen cryogenic milling of 11Cr-3Co-3W martensitic heat-resistant steel

Improvement of Work-Hardening Behavior of Co-Cr-W-Ni Alloy by Adding Mn/Fe for Balloon-Expandable Stents

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