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Journal of Materials Engineering and Performance

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30-03-2021

Corrosion Behavior and Microstructural Characterization of Friction Stir Welded API X70 Steel

Authors: J. M. Giarola, J. W. Calderón-Hernández, F. F. Conde, J. B. Marcomini, H. G. de Melo, J. A. Avila, W. W. Bose Filho

Published in: Journal of Materials Engineering and Performance | Issue 8/2021

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Abstract

Friction stir welding (FSW) is an excellent alternative process used in pipelines circumferential welds due to fusion welded joint low corrosion resistance. This study describes the corrosion resistance as a function of the microstructural features resulting from an API X70 FSW welded joint. The microstructural features were examined by optical microscopy, scanning electron microscopy, and x-ray diffraction. The corrosion analysis was conducted employing potentiodynamic polarization tests using an electrochemical microcell, which allowed to test small circular areas delimited by a 2 mm in diameter O-ring gasket. The base metal and heat-affected zone were the most susceptible regions to corrosion due to their banded microstructures. The re-stirred-zone and stir zone were the most resistant regions to corrosion which was associated to grain refinement. The corrosion rate presented by the base metal and the heat-affected zone was approximately six times higher than the region of least susceptibility to corrosion, in this case, the re-stirred-zone.

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Title: Corrosion Behavior and Microstructural Characterization of Friction Stir Welded API X70 Steel
Authors: J. M. Giarola
J. W. Calderón-Hernández
F. F. Conde
J. B. Marcomini
H. G. de Melo
J. A. Avila
W. W. Bose Filho
Publication date: 30-03-2021
Publisher: Springer US
Published in: Journal of Materials Engineering and Performance / Issue 8/2021
Print ISSN: 1059-9495
Electronic ISSN: 1544-1024
DOI: https://doi.org/10.1007/s11665-021-05640-4

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