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
复制标题
添加6%Mn的低屈服应力Co-Cr-W-Ni合金开发用于球囊扩张支架
DOI：
10.1007/s11661-021-06374-7
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
T. Nakano and T. Narushima
中科院分区：
文献类型：
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作者：
S. Yanagihara;K. Ueki;K. Ueda;M. Nakai;T. Nakano and T. Narushima
这是第一份通过在ASTM F90 Co-20Cr-15W-10Ni （CCWN，质量pct）合金中添加6质量pct Mn来开发Co-Cr-W-Ni-Mn合金的报告，该合金用于气球膨胀支架，具有良好的机械性能和耐腐蚀性平衡。研究了Mn对热锻、固溶处理、锻压和静态再结晶后合金组织、力学性能和腐蚀性能的影响。晶粒尺寸为~ 20µm（再结晶条件：1523 K， 150秒）的加锰合金的极限抗拉强度为1131 MPa，抗0.2%应力为535 MPa，塑性伸长率为66%。此外，与ASTM F90 CCWN合金相比，它在保持高强度的同时具有更高的延展性和更低的屈服应力。Mn的加入可提高层错能（SFE），从而抑制了相交层错的形成，降低了屈服应力。低屈服应力对抑制支架后坐是有效的。此外，增加应力强度可以抑制塑性变形过程中应变诱导的马氏体相变，从而提高塑性。添加锰的合金也表现出良好的耐腐蚀性，类似于ASTM F90 CCWN合金。mn - Co-Cr-W-Ni合金适合用作球囊膨胀支架。
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 ~ 20µm (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.