Corrosion Behavior and Microstructural Characterization of Friction Stir Welded API X70 Steel
| Autor: | J. A. Avila, Fábio Faria Conde, J. B. Marcomini, José Wilmar Calderón-Hernández, H.G. de Melo, W.W. Bose Filho, J. M. Giarola |
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| Přispěvatelé: | Universitat Politècnica de Catalunya. Departament de Resistència de Materials i Estructures a l'Enginyeria, Universidade de São Paulo (USP), Universidade Estadual Paulista (Unesp) |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
POLARIZAÇÃO Friction Friction stir welding Scanning electron microscope API 5L X70 Corrosion resistance Acer 02 engineering and technology Welding Microestructura Enginyeria dels materials [Àrees temàtiques de la UPC] 01 natural sciences Electrochemical microcell law.invention Corrosion Optical microscope law 0103 physical sciences General Materials Science Fricció Base metal Microstructure 010302 applied physics Corrosion rate Mechanical Engineering Gasket Metallurgy 021001 nanoscience & nanotechnology Mechanics of Materials Steel Potentiodynamic polarization tests 0210 nano-technology |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP Scopus Repositório Institucional da UNESP Universidade Estadual Paulista (UNESP) instacron:UNESP UPCommons. Portal del coneixement obert de la UPC Universitat Politècnica de Catalunya (UPC) |
| Popis: | Made available in DSpace on 2021-06-25T10:27:45Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-01-01 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. Department of Materials Engineering University of São Paulo (USP), Av. Trabalhador São Carlense 400 Department of Metallurgical and Materials Engineering University of São Paulo (USP), Av. Professor Mello Moraes, 2463 - Butantã São Paulo State University (UNESP), Campus of São João da Boa Vista São Paulo State University (UNESP), Campus of São João da Boa Vista |
| Databáze: | OpenAIRE |
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