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In Situ DIC Study on LCF Behavior of Retired Weld Joint Subjected to Prolonged Service at Elevated Temperature

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

By using digital image correlation (DIC), low-cycle fatigue (LCF) behavior of CrMoV weld joint taken from a retired gas turbine rotor after 15-year service was investigated at 500 °C and 540 °C. The most remarkable plastic strain was observed in the weld metal (WM), which was up to 6 times of the global strain at mid-life cycle. Due to the cyclic accumulation of local deformation, the stress–strain hysteresis loops relative to tensile or compressive strain concentration area in WM displayed the ratchetting shape. The local deformation accumulation of WM was attributed to the effect of the equiaxed grain zone near the WM center. The accumulated plastic strain was considered as the main fatigue failure mechanism.

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Acknowledgements

The authors gratefully acknowledge the financial supports by the SJTU Global Strategic Partnership Fund (2019-2021 SJTU-OU) and the National Natural Science Foundation of China (No. 52001200) and the experimental supports by Instrumental Analysis Center of SJTU.

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Authors and Affiliations

  1. Shanghai Key Laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China

    Anqi Zuo, Chendong Shao, Mingzhe Fan & Fenggui Lu

  2. Shanghai Turbine Plant of Shanghai Electric Power Generation Equipment Co. Ltd., Shanghai, 200240, China

    Xia Liu

  3. Joining and Welding Research Institute, Osaka University, Osaka, 567-0047, Japan

    Ninshu Ma

Authors
  1. Anqi Zuo
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  2. Xia Liu
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  3. Chendong Shao
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  4. Mingzhe Fan
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  5. Ninshu Ma
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  6. Fenggui Lu
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Correspondence to Chendong Shao or Fenggui Lu.

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Zuo, A., Liu, X., Shao, C. et al. In Situ DIC Study on LCF Behavior of Retired Weld Joint Subjected to Prolonged Service at Elevated Temperature. Acta Metall. Sin. (Engl. Lett.) 35, 1317–1328 (2022). https://doi.org/10.1007/s40195-021-01353-8

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  • DOI: https://doi.org/10.1007/s40195-021-01353-8

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