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3D X-ray tomography characterization of creep cavities in small-punch tested 316 stainless steels

机译：小冲头测试316不锈钢中蠕变腔的3D X射线断层扫描表征

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摘要

Small-punch (SP) test has become an effective approach to evaluate creep properties of critical structural components in fusion and power plants for recent years. To explore the SP test technique, here we report quantitative analysis of creep cavities in the SP creep tested 316 stainless steel specimen at 600 °C and 500 N using a three dimensional X-ray tomography system. The results show that creep cavities nucleated preferentially at four kinds of places: high angle grain boundaries, intersection of twins and grain boundaries, triple junctions and intersections of first order and second order twins. The cavity morphology shows that both of the average size and the density of the cavities close to the fracture are the largest. The distribution of the local stress evaluated by the distribution of the cavities provides more details for an understanding of creep damage evolution in the 316 stainless steel at high temperature.
机译：近年来，小冲孔（SP）测试已成为评估聚变和发电厂关键结构部件蠕变特性的有效方法。为了探索SP测试技术，我们在此报告了使用三维X射线断层扫描系统在600 andC和500 N下经SP蠕变测试的316不锈钢试样中蠕变腔的定量分析。结果表明，蠕变腔在四个位置上优先成核：高角度晶界，孪晶与晶界的交点，三重晶界和一阶和二阶孪晶的交点。孔洞形态表明，靠近裂缝的孔洞的平均尺寸和密度最大。通过空腔分布评估的局部应力分布为了解316不锈钢在高温下的蠕变损伤发展提供了更多细节。

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  • 来源
    《Materials Science and Engineering》 |2018年第may2期|69-74|共6页
  • 作者

    Li-Yi Wang; Zhu-Man Song; Xue-Mei Luo; Guang-Ping Zhang;

  • 作者单位

    Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences,School of Materials Science and Engineering, University of Science and Technology of China;

    Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences;

    Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences;

    Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences;

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

    Small punch creep test; 3D X-ray tomography; Creep cavity; Damage;

    机译：小冲头蠕变测试;3D X射线断层扫描;蠕变腔;损伤;

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