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Influence of overloads on dwell time fatigue crack growth in Inconel 718

机译：过载对Inconel 718中停留时间疲劳裂纹扩展的影响

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摘要

Inconel 718 is one of the most commonly used superalloys for high temperature applications in gasturbines and aeroengines and is for example used for components such as turbine discs. Turbine discs can be subjected to temperatures up to ～700 ℃ towards the outer radius of the disc. During service, the discs might start to develop cracks due to fatigue and long dwell times. Additionally, temperature variations during use can lead to large thermal transients during start-up and shutdown which can lead to overload peaks in the normal dwell time cycle. In this study, tests at 550 ℃ with an overload prior to the start of each dwell time, have been performed. The aim of the investigation was to get a better understanding of the effects of overloads on the microstructure and crack mechanisms. The micro-structure was studied using electron channelling contrast imaging (ECCI). The image analysis toolbox in Matlab was used on cross sections of the cracks to quantify: crack length, branch length, and the number of branches in each crack. It was found that the amount of crack branching increases with an increasing overload and that the branch length decreases with an increasing overload. When the higher overloads were applied, the dwell time effect was almost cancelled out. There is a strong tendency for an increased roughness of the crack path with an increasing crack growth rate.
机译：Inconel 718是燃气轮机和航空发动机高温应用中最常用的高温合金之一，例如用于涡轮盘等部件。涡轮盘朝盘的外半径可承受的最高温度约为700℃。在维修过程中，由于疲劳和长时间停留，圆盘可能会开始出现裂纹。此外，使用过程中的温度变化可能会导致在启动和关闭过程中产生较大的热瞬变，从而可能导致正常驻留时间周期内出现过载峰值。在这项研究中，已经在每个停留时间开始之前在550℃下进行了过载测试。研究的目的是更好地了解过载对显微组织和裂纹机理的影响。使用电子通道对比度成像（ECCI）研究了微结构。 Matlab中的图像分析工具箱用于对裂缝的横截面进行量化：裂缝长度，分支长度以及每个裂缝中的分支数量。发现裂纹分支的数量随着过载的增加而增加，并且分支长度随着过载的增加而减小。当施加更高的过载时，停留时间效应几乎被抵消。裂纹路径的粗糙度随着裂纹扩展速率的增加而存在增加的强烈趋势。

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  • 来源
    《Materials Science and Engineering》 |2014年第26期|398-405|共8页
  • 作者

    Jonas Saarimaeki; Johan Moverare; Robert Eriksson; Sten Johansson;

  • 作者单位

    Division of Engineering Materials, Department of Management and Engineering, Linkoeping University, SE-58183 Linkoeping, Sweden;

    Division of Engineering Materials, Department of Management and Engineering, Linkoeping University, SE-58183 Linkoeping, Sweden,Siemens Industrial Turbomachinery AB, Materials Technology, SE-61283 Finspang, Sweden;

    Division of Engineering Materials, Department of Management and Engineering, Linkoeping University, SE-58183 Linkoeping, Sweden;

    Division of Engineering Materials, Department of Management and Engineering, Linkoeping University, SE-58183 Linkoeping, Sweden;

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

    Nickel based superalloys; Fatigue; Fracture; Mechanical characterization; Electron microscopy;

    机译：镍基高温合金;疲劳;断裂;机械特性电子显微镜;

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