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Modeling of thermal cycles and microstructural analysis of pipeline steels processed by friction stir processing

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Abstract

During friction stir welding or processing (FSP), temperature and deformation have influence on the final microstructure and mechanical properties. Studying microstructures before and after welding might help interpreting mechanical and corrosion resistance; however, microstructural evolution during the process remains unknown. In this study, a FSP model of pipeline steel plates was developed. Thermocouples were inserted in different positions and temperature cycles were collected during FSP. The collected data was used to complete the numerical model based on computational fluid dynamics (CFD). The CFD model simulated the material flow and heat transfer in FSP considering the material as a fluid. The standard error between the peak temperatures of the simulation and experimental results was below 1%. The model allowed correlating peak temperatures and cooling rates to the obtained microstructures after FSP. Numerical results showed that peak temperatures and dwell times in the stir zone were high enough to cause grain coarsening. This observation was demonstrated upon prior-austenite grain size measurements.

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Acknowledgements

The authors would like to thank the LNNano for the provision of the FEI ® Quanta 650FEG SEM/EBSD microscope, FSW machine, and metallography facilities; PETROBRAS for providing economic funding; and Tenaris Confab for the material donation.

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Authors and Affiliations

  1. São Paulo State University (UNESP), Campus de São João da Boa Vista, Av. Profª Isette Corrêa Fontão, 505, Jardim das Flores, São João da Boa Vista, SP, 13876-750, Brazil

    J. A. Avila

  2. Brazilian Nanotechnology National Laboratory, Rua Giuseppe Máximo Scolfaro 10000, Campinas, SP, 13083970, Brazil

    R. A. R. Giorjao

  3. Department of Metallurgical and Materials Engineering, University of São Paulo (USP), São Paulo, SP, 05508-900, Brazil

    R. A. R. Giorjao

  4. EIA University, Km 2 + 200 Vía al Aeropuerto José María Córdova, Envigado, 055428, Antioquia, Colombia

    J. Rodriguez

  5. School of Mechanical Engineering, University of Campinas, Rua Mendeleyev 200, Campinas, SP, Brazil

    E. B. Fonseca

  6. The Ohio State University, 1248 Arthur E. Adams Drive, Columbus, OH, 43221, USA

    A. J. Ramirez

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  1. J. A. Avila
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  2. R. A. R. Giorjao
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  3. J. Rodriguez
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  4. E. B. Fonseca
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  5. A. J. Ramirez
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Correspondence to J. A. Avila.

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Avila, J.A., Giorjao, R.A.R., Rodriguez, J. et al. Modeling of thermal cycles and microstructural analysis of pipeline steels processed by friction stir processing. Int J Adv Manuf Technol 98, 2611–2618 (2018). https://doi.org/10.1007/s00170-018-2408-9

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  • DOI: https://doi.org/10.1007/s00170-018-2408-9

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