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Study on Microstructure and Properties of Welded Joint of L360QS/N08825 Bimetallic Composite Pipe

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Abstract

In this study, the three-phase zone of welded joints in L360QS/N08825 bimetallic composite pipes was analyzed using experimental methods such as room temperature impact, hardness, and room temperature stretching of prefabricated defects. The fracture morphology, chemical composition, and microstructure of the three-phase region were observed and analyzed using optical microscopy, scanning electron microscopy, and EDS energy spectroscopy. The findings indicate a clear boundary between the microstructures in the three-phase zone, with the microstructure in the heat-affected zone of the base material L360QS growing significantly, while that in the heat-affected zone of the lining layer does not grow significantly. Dendritic austenite grows in the weld perpendicular to the fusion line. The tensile strengths of the heat-affected zone and weld zone were 557.6 and 507.3 MPa, respectively. The presence of cracks and inclusions were the main causes of weld fractures.

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All data and models generated or used during the study appear in the submitted article.

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Acknowledgments

This research work was supported by the Natural Science Foundation of Sichuan Province of China (2022NSFSC0325) and Research on Quality Control of Manufacturing, Welding and Testing of UNS N08825 Bimetal Clad Pipe.

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Authors and Affiliations

  1. PetroChina Southwest Oil and Gasfield Company, Chengdu, 610500, China

    Yongqiao Ning

  2. PetroChina Southwest Oil and Gasfield Company Sichuan Gas District, Dazhou, 635000, China

    Shufeng Qiu, Li Tang & Lan Tang

  3. School of New Energy and Materials, Southwest Petroleum University, Chengdu, 610500, China

    Yongdu Li & Mei Yang

Authors
  1. Yongqiao Ning
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  2. Shufeng Qiu
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  3. Li Tang
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  4. Lan Tang
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Correspondence to Mei Yang.

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Ning, Y., Qiu, S., Tang, L. et al. Study on Microstructure and Properties of Welded Joint of L360QS/N08825 Bimetallic Composite Pipe. J. of Materi Eng and Perform (2024). https://doi.org/10.1007/s11665-024-09159-2

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  • DOI: https://doi.org/10.1007/s11665-024-09159-2

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