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Facile route to bulk ultrafine-grain steels for high strength and ductility

机译：用于高强度和延展性的散装超细钢的容易途径

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摘要

Steels with sub-micrometre grain sizes usually possess high toughness and strength, which makes them promising for lightweighting technologies and energy-saving strategies. So far, the industrial fabrication of ultrafine-grained (UFG) alloys, which generally relies on the manipulation of diffusional phase transformation, has been limited to steels with austenite-to-ferrite transformation(1-3). Moreover, the limited work hardening and uniform elongation of these UFG steels(1,4,5) hinder their widespread application. Here we report the facile mass production of UFG structures in a typical Fe-22Mn-0.6C twinning-induced plasticity steel by minor Cu alloying and manipulation of the recrystallization process through the intragranular nanoprecipitation (within 30 seconds) of a coherent disordered Cu-rich phase. The rapid and copious nanoprecipitation not only prevents the growth of the freshly recrystallized sub-micrometre grains but also enhances the thermal stability of the obtained UFG structure through the Zener pinning mechanism(6). Moreover, owing to their full coherency and disordered nature, the precipitates exhibit weak interactions with dislocations under loading. This approach enables the preparation of a fully recrystallized UFG structure with a grain size of 800 +/- 400 nanometres without the introduction of detrimental lattice defects such as brittle particles and segregated boundaries. Compared with the steel to which no Cu was added, the yield strength of the UFG structure was doubled to around 710 megapascals, with a uniform ductility of 45 per cent and a tensile strength of around 2,000 megapascals. This grain-refinement concept should be extendable to other alloy systems, and the manufacturing processes can be readily applied to existing industrial production lines.Bulk ultrafine-grained steel is prepared by an approach that involves the rapid production of coherent, disordered nanoprecipitates, which restrict grain growth but do not interfere with twinning or dislocation motion, resulting in high strength and ductility.
机译：具有亚微米粒尺寸的钢通常具有高韧性和强度，这使得它们对轻质技术和节能策略有望。到目前为止，超细晶粒（UFG）合金的工业制造通常依赖于操纵扩散相转化的合金，仅限于具有奥氏体 - 铁氧体转化（1-3）的钢。而且，这些UFG钢的有限工作和均匀伸长率（1,4,5）阻碍了它们的广泛应用。在这里，我们通过核心纳米沉淀（30秒内）通过细胞纳米沉淀（30秒内）通过次要Cu-22Mn-0.6C Twinning诱导的可塑性钢中的UFG结构在典型的Fe-22Mn-0.6C Twinning诱导的可塑性钢中报告了UFG结构的容纳批量生产。阶段。快速和大量的纳米尺寸不仅可以防止新重结晶的亚微米颗粒的生长，而且还通过齐纳钉扎机构（6）来增强所获得的UFG结构的热稳定性。此外，由于其具有完全一致性和无序性的性质，沉淀物表现出与负载下的脱位相互作用。这种方法使得能够制备具有800 +/- 400纳米的晶粒尺寸的完全重结晶的UFG结构，而不引入有害的晶格缺陷，例如脆性粒子和分离的边界。与没有加入Cu的钢相比，UFG结构的屈服强度加倍至约710兆帕斯卡，延展性为45％，拉伸强度约为2,000兆匹达血管。这种晶粒细化概念应可扩展到其他合金系统，并且可以容易地应用于现有的工业生产线。通过涉及连贯的纳米尺寸的快速生产的方法制备诸如涉及连贯性的纳米尺寸的方法的诸如限制谷物生长但不干扰孪生或脱位运动，导致高强度和延展性。

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  • 来源
    《Nature》 |2021年第7845期|262-267|共6页
  • 作者

    Gao Junheng; Jiang Suihe; Zhang Huairuo; Huang Yuhe; Guan Dikai; Xu Yidong; Guan Shaokang; Bendersky Leonid A.; Davydov Albert V; Wu Yuan; Zhu Huihui; Wang Yandong; Lu Zhaoping; Rainforth W. Mark;

  • 作者单位

    Univ Sheffield Dept Mat Sci & Engn Sheffield S Yorkshire England;

    Univ Sci & Technol Beijing Beijing Adv Innovat Ctr Mat Genome Engn State Key Lab Adv Met & Mat Beijing Peoples R China;

    Theiss Res Inc La Jolla CA 92037 USA|NIST Mat Sci & Engn Div Gaithersburg MD 20899 USA;

    Univ Sheffield Dept Mat Sci & Engn Sheffield S Yorkshire England;

    Univ Sheffield Dept Mat Sci & Engn Sheffield S Yorkshire England;

    Univ Sheffield Dept Mat Sci & Engn Sheffield S Yorkshire England;

    Zhengzhou Univ Sch Mat Sci & Engn Zhengzhou Peoples R China;

    NIST Mat Sci & Engn Div Gaithersburg MD 20899 USA;

    NIST Mat Sci & Engn Div Gaithersburg MD 20899 USA;

    Univ Sci & Technol Beijing Beijing Adv Innovat Ctr Mat Genome Engn State Key Lab Adv Met & Mat Beijing Peoples R China;

    Univ Sci & Technol Beijing Beijing Adv Innovat Ctr Mat Genome Engn State Key Lab Adv Met & Mat Beijing Peoples R China;

    Univ Sci & Technol Beijing Beijing Adv Innovat Ctr Mat Genome Engn State Key Lab Adv Met & Mat Beijing Peoples R China;

    Univ Sci & Technol Beijing Beijing Adv Innovat Ctr Mat Genome Engn State Key Lab Adv Met & Mat Beijing Peoples R China;

    Univ Sheffield Dept Mat Sci & Engn Sheffield S Yorkshire England;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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