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首页> 外文期刊>Materials science forum >Improvement of Strength and Ductility by Combining Static Recrystallization and Unique Heat Treatment in Co-20Cr-15W-10Ni Alloy for Stent Application
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Improvement of Strength and Ductility by Combining Static Recrystallization and Unique Heat Treatment in Co-20Cr-15W-10Ni Alloy for Stent Application

机译：通过组合静态重结晶和独特的热处理来改善强度和延展性，用于支架应用中的CO-20CR-15W-10NI合金

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摘要

The Co-20Cr-15W-10Ni (CCWN, mass%) alloy has excellent corrosion resistance and strength-ductility balance and is applied in almost all balloon-expandable stent platforms. To further reduce the invasiveness of stent placement, it is necessary to reduce the diameter of the stent. That is, both high strength and high ductility should be achieved while maintaining a low yield stress. In our previous studies, it was discovered that low-temperature heat-treatment (LTHT) at 873 K improves the elongation of the CCWN alloy. In this study, we focused on the grain refinement by swaging and static recrystallization to improve the strength of the alloy. The as-swaged alloy was recrystallized at 1373-1473 K for 100-300 s, followed by LTHT. A fine grain structure with an average grain size of 3-17 μm was obtained by static recrystallization. The r|-phase (M_(12)X-M_6X type precipitates, M: metallic elements, X: C and/or N) formed during the recrystallization at 1373-1448 K. The alloys recrystallized at 1448 and 1473 K had a homogeneous structure with a small variation in the grain size. On the other hand, the alloys recrystallized at 1373 and 1423 K had an inhomogeneous structure in which fine and coarse grains were mixed. Both the strength and ductility of the CCWN alloy were improved by combining high-temperature short-time recrystallization and LTHT.
机译：CO-20CR-15W-10NI（CCWN，质量％）合金具有优异的耐腐蚀性和强度 - 延展性平衡，并且应用于几乎所有气球可扩展的支架平台。为了进一步降低支架放置的侵袭性，有必要降低支架的直径。也就是说，应在保持低屈服应力的同时实现高强度和高延展性。在我们以前的研究中，发现873k的低温热处理（LTHT）改善了CCWN合金的伸长。在这项研究中，我们通过锻炼和静态重结晶来专注于晶粒细化以提高合金的强度。以1373-1473K重结晶100-300秒，然后是LTHT。通过静态再结晶获得平均晶粒尺寸为3-17μm的细粒结构。在1373-1448k的重结晶期间形成的r |相位（m_（12）X-m_6x型沉淀物，M：金属元素，X：C和/或N），其在1448和1473k下重结晶的合金具有均匀的结构小的晶粒尺寸的变化。另一方面，在1373和1423k下重结晶的合金具有非均匀结构，其中混合细细和粗晶粒。通过组合高温短时再结晶和LTHT来改善CCWN合金的强度和延展性。

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  • 来源
    《Materials science forum》 |2021年第2期|1503-1509|共7页
  • 作者

    Kosuke Ueki; Son Yanagihara; Kyosuke Ueda; Masaaki Nakai; Takayoshi Nakano; Takayuki Narushima;

  • 作者单位

    Department of Mechanical Engineering Faculty of Science and Engineering Kindai University 3-4-1 Kowakae Higashiosaka 577-8502 Japan;

    Department of Materials Processing School of Engineering Tohoku University 6-6-02 Aza-Aoba Aramaki Aoba-ku Sendai 980-8579 Japan;

    Department of Materials Processing School of Engineering Tohoku University 6-6-02 Aza-Aoba Aramaki Aoba-ku Sendai 980-8579 Japan;

    Department of Mechanical Engineering Faculty of Science and Engineering Kindai University 3-4-1 Kowakae Higashiosaka 577-8502 Japan;

    Division of Materials Science and Engineering School of Engineering Osaka University 2-1 Yamada-Oka Suita Osaka 565-0871 Japan;

    Department of Materials Processing School of Engineering Tohoku University 6-6-02 Aza-Aoba Aramaki Aoba-ku Sendai 980-8579 Japan Research Center for Structural Materials National Institute for Materials Science (NIMS) 1-2-1 Sengen Tsukuba Ibaraki 305-0047 Japan;

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  • 正文语种 eng
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  • 关键词

    Co-Cr alloy; stent; mechanical properties; heat treatment; static recrystallization;

    机译：CO-CR合金;支架;机械性能;热处理;静态再结晶;

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