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Simultaneous improvement of tensile strength and ductility in micro-duplex structure consisting of austenite and ferrite

机译：同时提高奥氏体和铁素体组成的双相组织的拉伸强度和延展性

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摘要

A micro-duplex structure consisting of austenite and ferrite was produced by equal channel angular pressing and subsequent intercritical annealing. As compared to coarse-grained (CG) counterpart, the strength and ductility of micro-duplex samples are enhanced simultaneously due to smaller grain sizes in both phases and more uniformly distributed austenite in ferrite matrix. The average yield stress and uniform elongation are increased to 540 MPa and 0.3 as compared to 403MPa and 0.26 of its CG counterpart respectively. The Hall-Petch coefficients of austenite and ferrite grain boundaries were quantitatively measured as 224.9 and 428.9 MPa μm~(1/2) respectively. In addition, a Hall-Petch type coefficient was used to describe the ability of phase boundary to obstruct dislocation motion, which was measured as 309.7 MPa μm~(1/2). Furthermore, the surface-to-volume ratio of phase boundary in micro-duplex structure was estimated to be 1.17 × 10~6 m~(-1), which is increased by an order of magnitude as compared to 1.2 × 10~5 m~(-1) of its CG counterpart. Based on the strain gradient theory, a model was proposed to describe the effect of surface-to-volume ratio of phase boundary on strain hardening rate, which shows a good agreement with the experimental results.
机译：通过等通道角挤压和随后的临界退火，产生了由奥氏体和铁素体组成的微双相结构。与粗晶粒（CG）相比，由于双相的晶粒尺寸较小，铁素体基体中的奥氏体分布更均匀，因此微双相试样的强度和延展性同时提高。平均屈服应力和均匀伸长率分别比CG对应的403MPa和0.26分别增加到540 MPa和0.3。定量测量的奥氏体和铁素体晶界的霍尔-Petch系数分别为224.9和428.9 MPaμm〜（1/2）。另外，使用霍尔-帕奇（Hall-Petch）型系数来描述相界阻碍位错运动的能力，其测量为309.7 MPaμm〜（1/2）。此外，估计微双相结构中相界的表面体积比为1.17×10〜6 m〜（-1），与1.2×10〜5 m相比，增加了一个数量级。 〜（-1）对应的CG。基于应变梯度理论，提出了描述相界表面体积比对应变硬化速率影响的模型，与实验结果吻合良好。

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  • 来源
    《Materials Science and Engineering》 |2014年第17期|563-571|共9页
  • 作者

    L. Chen; F.P. Yuan; P. Jiang; J.J. Xie; X.L. Wu;

  • 作者单位

    State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Science, Beijing 100190, PR China;

    State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Science, Beijing 100190, PR China;

    State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Science, Beijing 100190, PR China;

    State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Science, Beijing 100190, PR China;

    State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Science, Beijing 100190, PR China;

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  • 正文语种 eng
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  • 关键词

    Duplex stainless steel; Equal channel angular pressing; Strain hardening; Modeling; Phase boundary;

    机译：双相不锈钢;等通道角压;应变硬化;造型;相界;

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