Corrosion Behavior and Microstructural Characterization of Friction Stir Welded API X70 Steel
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Data
2021-01-01
Autores
Giarola, J. M.
Calderón-Hernández, J. W.
Conde, F. F.
Marcomini, J. B.
de Melo, H. G.
Avila, J. A. [UNESP]
Bose Filho, W. W.
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Resumo
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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API 5L X70, corrosion rate, corrosion resistance, electrochemical microcell, friction stir welding, potentiodynamic polarization tests
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Journal of Materials Engineering and Performance.