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首页> 外文期刊>Materials Science and Engineering >Effect of shock loading on the microstructure, mechanical properties and grain boundary characteristics of HT-9 ferritic/martensitic steels
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Effect of shock loading on the microstructure, mechanical properties and grain boundary characteristics of HT-9 ferritic/martensitic steels

机译:冲击载荷对HT-9铁素体/马氏体钢的组织,力学性能和晶界特征的影响

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摘要

The microstructural changes and mechanical response of an HT-9 sample shock loaded to a peak pressure of 11 GPa have been investigated by TEM, XRD, microhardness and EBSD techniques. Dislocation densities obtained by both direct measurements (via TEM) and indirect calculations (by XRD and hardness) indicate that shock loading results in ~2-3 fold increase in dislocation density. TEM analyses show that the shape, and density of the dislocations change after shock loading. In addition, shock loading causes local plastic deformation of the continuous parallel lath structure in some regions, together with an overall decrease in the aspect ratio of laths due to local plastic deformation and lath fragmentation. As a result of XRD analyses, the fraction of edge dislocations is determined to increase by ~24% after shock loading. Furthermore, hardness increases by ~40 HV after shock loading due to the increased dislocation density. EBSD analyses show that the fraction of CSL boundaries decreases by ~5-10% as a result of shock loading.
机译:通过TEM,XRD,显微硬度和EBSD技术研究了HT-9样品在达到11 GPa峰值压力时的显微组织变化和力学响应。通过直接测量(通过TEM)和间接计算(通过XRD和硬度)获得的位错密度表明,冲击载荷导致位错密度增加了约2-3倍。 TEM分析表明,冲击载荷后,位错的形状和密度发生了变化。另外,冲击载荷引起连续平行板条结构在某些区域的局部塑性变形,以及由于局部塑性变形和板条破碎导致板条的纵横比整体降低。 X射线衍射分析的结果表明,冲击载荷后边缘位错的比例增加了约24%。此外,由于位错密度的增加,冲击载荷后硬度增加了约40 HV。 EBSD分析表明,由于冲击载荷的作用,CSL边界的比例降低了约5-10%。

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  • 来源
    《Materials Science and Engineering》 |2016年第10期|75-82|共8页
  • 作者单位

    MST-8, Los Alamos National Laboratory, P.O. Box 1663 Los Alamos, NM 87545, United States;

    MST-8, Los Alamos National Laboratory, P.O. Box 1663 Los Alamos, NM 87545, United States;

    MST-8, Los Alamos National Laboratory, P.O. Box 1663 Los Alamos, NM 87545, United States;

    MST-8, Los Alamos National Laboratory, P.O. Box 1663 Los Alamos, NM 87545, United States;

    MST-8, Los Alamos National Laboratory, P.O. Box 1663 Los Alamos, NM 87545, United States;

    MST-8, Los Alamos National Laboratory, P.O. Box 1663 Los Alamos, NM 87545, United States;

    MPA-CINT, Los Alamos National Laboratory, P.O. Box 1663 Los Alamos, NM 87545, United States;

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

    Shock loading; Dislocation density; TEM; Hardness; XRD; EBSD;

    机译:冲击负荷位错密度;TEM;硬度;XRD;欧洲可持续发展委员会;

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