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Tensile deformation, toughness and crack propagation studies of alloy 617.

机译：617合金的拉伸变形，韧性和裂纹扩展研究。

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摘要

Austenitic nickel-base Alloy 617 has been tested under tensile loading at temperatures relevant to both the Nuclear Hydrogen Initiative and the Next Generation Nuclear Plant programs of the U.S. Department of Energy. Two important metallurgical phenomena, namely dynamic strain aging (DSA) and yield strength anomaly (YSA), have been identified based on the resultant data. DSA was characterized by reduced plastic strain and serrations in the engineering stress versus engineering strain diagrams. YSA was manifested by enhanced yield strength at relatively higher temperatures. A mechanistic understanding of DSA and YSA phenomena has been developed based on the estimation of dislocation density, activation energy, work-hardening index and precipitate morphology, where applicable. Stress-intensity-factor and crack-growth-rates of this alloy have been evaluated with and without the presence of an acidic solution at different temperatures using fracture-mechanics-based principles. Fractographic evaluations of all tested specimens have also been performed to characterize the extent and morphology of failures resulting from different modes of loading.
机译：奥氏体镍基镍617合金已在与美国能源部的《核氢倡议》和《下一代核电站》计划相关的温度下进行了拉伸载荷测试。根据结果​​数据确定了两个重要的冶金现象，即动态应变时效（DSA）和屈服强度异常（YSA）。 DSA的特征在于工程应力与工程应变图之间的塑性应变和锯齿减少。 YSA表现为在较高温度下屈服强度提高。对DSA和YSA现象的机械理解是基于对位错密度，活化能，加工硬化指数和析出物形态的估计（如果适用）。使用基于断裂力学的原理，在有或没有酸性溶液的情况下，已经评估了该合金在不同温度下的应力强度因子和裂纹扩展速率。还对所有测试样品进行了分形评估，以表征不同加载方式导致的破坏的程度和形态。

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  • 作者

    Marthandam, Vikram.;

  • 作者单位

    University of Nevada, Las Vegas.;

  • 授予单位 University of Nevada, Las Vegas.;
  • 学科 Engineering Mechanical.;Engineering Metallurgy.;Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 2008
  • 页码 179 p.
  • 总页数 179
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 机械、仪表工业;工程材料学;冶金工业;
  • 关键词

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