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首页> 外文期刊>Materials Science and Engineering >Exceptional tensile properties under cryogenic temperature in heterogeneous laminates induced by non-uniform martensite transformation and strain derealization
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Exceptional tensile properties under cryogenic temperature in heterogeneous laminates induced by non-uniform martensite transformation and strain derealization

机译：非均匀马氏体转化和应变致动诱导的非均相层压板中低温温度下的卓越拉伸性能

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摘要

In the present study, the heterogeneous low C steel/304 austenite stainless steel (SS) laminates were observed to have exceptional tensile properties under cryogenic temperature, i.e., the yield strength and the uniform elongation were found to be significantly elevated simultaneously compared to these under room temperature. The underlying deformation mechanisms have been revealed by a novel tensile testing method coupled with in-situ digital image correlation imaging under cryogenic environment, and subsequent microstructure observations. Strain localization was found to initiate from low C steel, propagate across the interface and then towards 304 SS side. While the formed localized strain zone (LSZ) was observed to be delocalized at larger tensile strain due to the propagation of LSZ towards the un-deformed region along the gage length. Martensite transformation was found to be concentrated in the LSZ of 304 SS to regain strain hardening ability and reduce severity of strain concentration. Strain partitioning between 304 SS and low C steel was found to be more significant in the LSZ than that out of the LSZ. The non-uniform martensite transformation along the gage length should be the origin for the strain delocalization in the LSZ, resulting in large ductility in the laminates under cryogenic temperature.
机译：在本研究中，观察到非均相低C钢/ 304奥氏体不锈钢（SS）层压板在低温下具有出色的拉伸性能，即，发现屈服强度和均匀的伸长率与这些相比显着升高室内温度。已经通过在低温环境下与原位数字图像相关成像耦合的新型拉伸试验方法和随后的微观结构观察，揭示了潜在的变形机制。发现应变定位从低C钢启动，在界面上传播，然后朝向304 SS侧传播。虽然观察到所形成的局部应变区（LSZ）在较大的拉伸应变中被移植到较大的拉伸菌，但由于LSZ沿着量身朝向未变形区域的传播。发现马氏体转化被浓缩在304秒的LSZ中，以重新获得应变硬化能力并减少应变浓度的严重程度。在304SS和低C钢之间的应变分区在LSZ中比LSZ更显着。沿着量长的非均匀马氏体转化应该是LSZ中应变临床化的起源，导致在低温温度下层压板中的大延展性。

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  • 来源
    《Materials Science and Engineering》 |2020年第jul22期|139780.1-139780.10|共10页
  • 作者

    Jinyan He; Fuping Yuan; Muxin Yang; Lingling Zhou; Sihai Jiao; Xiaolei Wu;

  • 作者单位

    State Key Laboratory of Nonlinear Mechanics Institute of Mechanics Chinese Academy of Science 15 Beisihuan West Road Beijing 100190 China School of Engineering Science University of Chinese Academy of Sciences 19A Yuquan Road Beijing 100049 China;

    State Key Laboratory of Nonlinear Mechanics Institute of Mechanics Chinese Academy of Science 15 Beisihuan West Road Beijing 100190 China School of Engineering Science University of Chinese Academy of Sciences 19A Yuquan Road Beijing 100049 China;

    State Key Laboratory of Nonlinear Mechanics Institute of Mechanics Chinese Academy of Science 15 Beisihuan West Road Beijing 100190 China;

    State Key Laboratory of Nonlinear Mechanics Institute of Mechanics Chinese Academy of Science 15 Beisihuan West Road Beijing 100190 China;

    Baosteel Research Institute Baoshan Iron & Steel Co Ltd Shanghai 201900 China;

    State Key Laboratory of Nonlinear Mechanics Institute of Mechanics Chinese Academy of Science 15 Beisihuan West Road Beijing 100190 China School of Engineering Science University of Chinese Academy of Sciences 19A Yuquan Road Beijing 100049 China;

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

    Twins; Heterogeneous laminates; Cryogenic tensile properties; Martensite transformation; Strain delocalization;

    机译：双胞胎;异质层压板;低温拉伸性能;马氏体转型;应变临床化;

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