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Mechanical properties and nanostructures in a duplex stainless steel subjected to equal channel angular pressing

机译：等通道角压下双相不锈钢的力学性能和纳米结构

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摘要

The nanostructure and resultant mechanical property were studied in an UNS S32304 duplex stain-less steel subjected to equal channel angular pressing. The successive refinement of original grains was observed to happen in dual phases, i.e., austenite and ferrite, during 4-pass pressing. Both phases exhibit similar lamellar features of microstructures by the formation of dislocation boundaries and their mis-orientation evolution with increasing strains. The deformation twinning and martensitic transformation as well were observed to happen in austenite. The transversal spacing of elongated grains is 79 nm in austenite and 130 nm in ferrite, respectively. After annealing at 973 K for 20min, the elongated grains tend to become equiaxed, and the average size of nanograins increases to 108 nm in austenite and 235 nm in ferrite, respectively. The tensile tests show that the yield strength of the dual-phase nanostructure is 1460 MPa after 4-pass pressing, as compared to 403 MPa of its coarse-grained counterpart, but with uni-form elongation of merely 2%. After annealing at 973 K, the uniform elongation increases to 7% with the yield strength of 1100 MPa. In addition, different stages of strain hardening were observed in various microstructures during tensile testing, and the corresponding plastic responses were discussed.
机译：在UNS S32304双相不锈钢的等通道角压下研究了纳米结构和所得的机械性能。在四道次压制过程中，观察到原始晶粒的连续细化发生在双相中，即奥氏体和铁素体。通过形成位错边界以及随着应变的增加它们的取向错误演变，两个相都表现出相似的微结构层状特征。观察到奥氏体中也发生了孪晶形变和马氏体相变。拉长晶粒的横向间距在奥氏体中为79 nm，在铁素体中为130 nm。在973 K下退火20分钟后，拉长的晶粒趋于等轴，奥氏体中纳米晶粒的平均尺寸分​​别增加到108 nm和铁素体中达到235 nm。拉伸试验表明，四道次压制后的双相纳米结构的屈服强度为1460 MPa，而其粗颗粒对应结构的屈服强度为403 MPa，但均匀伸长率仅为2％。在973 K退火后，均匀伸长率增加到7％，屈服强度为1100 MPa。此外，在拉伸试验期间，在各种微观结构中观察到了应变硬化的不同阶段，并讨论了相应的塑性响应。

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  • 来源
    《Materials Science and Engineering》 |2012年第15期|p.154-159|共6页
  • 作者

    L. Chen; F.P. Yuan; P.Jiang; 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;

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  • 正文语种 eng
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  • 关键词

    nanostructure; equal channel angular pressing; mechanical property; duplex stainless steel;

    机译：纳米结构等通道角压机械性能双相不锈钢;

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