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首页> 外文期刊>ISIJ international >Mechanism of Improved Ductility of 1 500 MPa-class Ultra-high Strength Cold-rolled Steel Sheet Produced by Rolling and Partitioning Method
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Mechanism of Improved Ductility of 1 500 MPa-class Ultra-high Strength Cold-rolled Steel Sheet Produced by Rolling and Partitioning Method

机译：通过轧制和分配方法生产的1 500 MPa级超高强度冷轧钢板延性的机理

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摘要

By using a steel with standardized chemical composition and conventional manufacturing processes for flat-rolled steel strip, a 1 500 MPa class stainless steel sheet, whose product of yield strength (YS) and total elongation (EI) exceeds 30 000 MPa%, was developed and its mass production was established. Besides the excellent YS-EI balance, the developed steel sheet has excellent performance for not only an anti-secondary work embrittlement but also high cycle fatigue endurance. Core technology of the developed method is composed of a combination of high precision cold-rolling and isothermal partitioning treatment in a batch furnace, named as a rolling and partitioning (R&P) method. By the R&P method, the microstructure of steel is controlled to the mixture of a strain-induced martensite as the matrix phase, and an optimum amount of retained austenite as the second phase which is dispersed in isolation and surrounded by the transformed martensite. In this paper, the microstructure formation during the R&P process and the deformation mechanism that would bring about the excellent strength-ductility balance are discussed based on the results obtained from the in situ neutron diffraction measurement. The results have revealed that the typical Luders-like stress-strain curve of R&P steel is caused by competitive plastic flow between austenite and martensite, and an effective transformation induced plasticity phenomenon.
机译：通过使用具有标准化化学成分的钢和用于平轧钢带的传统制造工艺，开发了一种1 500MPa类不锈钢板，其产率（Ys）的产物和总伸长率（EI）超过30 000MPa％并建立了大规模生产。除了出色的YS-EI平衡之外，发达的钢板的性能优异，不仅具有抗二次工作脆化，还具有高循环疲劳耐久性。开发方法的核心技术由批量炉中的高精度冷轧和等温隔离处理的组合组成，作为轧制和分区（R＆P）方法。通过R＆P方法，将钢的微观结构控制为应变诱导的马氏体作为基质相的混合物，以及作为第二相的最佳保留奥氏体的量，其分散地分散并被转化的马氏体包围。在本文中，基于从原位中子衍射测量获得的结果讨论了R＆P过程中的微观结构形成和将产生优异的强度 - 延展性平衡的变形机构。结果表明，R＆P钢的典型铅胶囊状应力 - 应变曲线是由奥氏体和马氏体之间的竞争性塑性流动引起的，以及有效的转化诱导的可塑性现象。

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  • 来源
    《ISIJ international》 |2020年第9期|2097-2106|共10页
  • 作者

    Yoshihiro HOSOYA; Yuta MATSUMURA; Yo TOMOTA; Yusuke ONUKI; Stefanus HARJO;

  • 作者单位

    R&D HQ. Tokushu Kinzoku Excel Co. Ltd. 6F Mejiro Hakubutsukan Bldg. 4-25 Mejiro 1-chome Toshima-ku Tokyo 171-0031 Japan;

    R&D HQ. Tokushu Kinzoku Excel Co. Ltd. 6F Mejiro Hakubutsukan Bldg. 4-25 Mejiro 1-chome Toshima-ku Tokyo 171-0031 Japan;

    Research Center of Structure Materials National Institute for Materials Science 1-2-1 Sengen Tsukuba Ibaraki 305-0047 Japan;

    Frontier Research Center for Applied Atomic Sciences Ibaraki University 162-1 Shirakata Tokai-mura Naka-gun Ibaraki 319-1106 Japan;

    J-PARC Center Japan Atomic Energy Agency 2-4 Shirakata Tokai-mura Naka-gun Ibaraki 319-1195 Japan;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    advanced high strength steel; stainless steel; TRIP; Rolling and Partitioning method; Luders strain; neutron diffraction; nanoindentation;

    机译：先进的高强度钢;不锈钢;旅行;轧制和分区方法;偏离菌株;中子衍射;纳米endentation.;

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