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Ultrasonic quantification of high temperature cyclic damage in an advanced nickel based superalloy

机译：先进的镍基高温合金中高温循环损伤的超声量化

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摘要

Present paper discusses about a new methodology to quantify cyclic damage through ultrasonic measurement Based on experimental results, correlations have been made between damage accumulated inside the material due to strain excursions and corresponding ultrasonic parameters. It has been proposed that based on the existing correlation between attenuation coefficient and number of cycles to failure, fatigue failure characteristics can be partitioned into two regimes (a) failures due to early nucleation and rapid propagation of cracks and (b) failures due to delayed propagation and crack coalescence. Plastic strain accumulation and surface crack density have been chosen as two physical parameters directly influencing attenuation coefficient and it has been observed that with increasing plastic strain accumulation, ultrasonic attenuation increases. Between two primary echoes of ultrasonic spectra, some secondary defect echoes have been found. A damage descriptor has been introduced by taking difference between the bandwidth of defect echo and backwall echo normalized by overall amplitude frequency distributions of backwall echo. It has been found to bear sensitivity towards surface crack density. This quantitative estimation differentiates between the classical descriptions of damage due to dislocation mediated plasticity, micro crack generation and coalescence.
机译：本文讨论了一种通过超声测量来量化循环损伤的新方法。基于实验结果，已经在材料内部由于应变偏移而积累的损伤与相应的超声参数之间建立了相关性。已经提出，基于衰减系数和失效循环数之间的现有相关性，疲劳失效特性可以分为两种状态：（a）由于早期成核和裂纹的快速传播而导致的失效，以及（b）由于延迟而导致的失效扩展和裂纹合并。选择塑性应变累积和表面裂纹密度作为直接影响衰减系数的两个物理参数，并且已经观察到，随着塑性应变累积的增加，超声衰减会增加。在超声频谱的两个主要回波之间，发现了一些次要缺陷回波。通过利用缺陷缺陷回波的带宽和后壁回波的带宽之间的差异（通过后壁回波的整体幅度频率分布归一化）来引入损伤描述符。已经发现对表面裂纹密度具有敏感性。这种定量估计区分了由位错介导的可塑性，微裂纹的产生和聚结引起的损伤的经典描述。

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  • 来源
    《Materials Science and Engineering》 |2015年第11期|194-204|共11页
  • 作者

    Kaustav Barat; A. Metya; S. Sathpathy; S. Sivaprasad; S. Tarafder; Sujoy Kumar Kar;

  • 作者单位

    Fatigue & Fracture Group, Materials Science & Technology Division, CSIR-National Metallurgical Laboratory, Jamshedpur 831007, India,Metallurgical & Materials Engineering, Indian Institute of Technology Kharagpur, Kharagpur 721302, India;

    Fatigue & Fracture Group, Materials Science & Technology Division, CSIR-National Metallurgical Laboratory, Jamshedpur 831007, India;

    Fatigue & Fracture Group, Materials Science & Technology Division, CSIR-National Metallurgical Laboratory, Jamshedpur 831007, India,Metallurgical & Materials Engineering, National Institute of Technology Rourkela, Rourkela 769008, India;

    Fatigue & Fracture Group, Materials Science & Technology Division, CSIR-National Metallurgical Laboratory, Jamshedpur 831007, India;

    Fatigue & Fracture Group, Materials Science & Technology Division, CSIR-National Metallurgical Laboratory, Jamshedpur 831007, India;

    Metallurgical & Materials Engineering, Indian Institute of Technology Kharagpur, Kharagpur 721302, India;

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

    Nickel based superalloy; High temperature low cycle fatigue; Ultrasonic waves; Fast Fourier transform; Defect echo; Haynes 282;

    机译：镍基高温合金;高温低周疲劳;超声波;快速傅立叶变换;缺陷回波;海恩斯282;

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