The effect of heat input on microstructure and HAZ expansion in dissimilar joints between API5L X80 / DSS 2205 steels using thermal cycles

Seyed Meisam  Zahraei; Reza Dehmolaei; Ali  Ashrafi

doi:10.3989/revmetalm.222

Autores/as

Seyed Meisam Zahraei Department of Materials Science and Engineering, Faculty of Engineering, Shahid Chamran University of Ahvaz https://orcid.org/0000-0002-7757-6484
Reza Dehmolaei Department of Materials Science and Engineering, Faculty of Engineering, Shahid Chamran University of Ahvaz - Steel Research Center, Shahid Chamran University of Ahvaz https://orcid.org/0000-0001-5205-3540
Ali Ashrafi Department of Materials Science and Engineering, Faculty of Engineering, Shahid Chamran University of Ahvaz - Department of Materials Engineering, Isfahan University of Technology https://orcid.org/0000-0001-5393-5860

DOI:

https://doi.org/10.3989/revmetalm.222

Palabras clave:

Acero, Austenita, Ciclos térmicos, Microestructura, Soldadura, Zona afectada por el calor, Zona de transición

Resumen

En esta investigación, se ha investigado el efecto de la entrada de calor durante el proceso de soldadura por arco de metal blindado (SMAW) sobre la microestructura y la zona afectada por el calor en la unión disimilar de los aceros API 5L X80/DS5 2205, mediante el registro de los ciclos térmicos a través de la implantación de un termopar en la dirección perpendicular de la línea de soldadura. El metal de aporte utilizado (electrodo) es DSS 2209. Se ha estudiado la microestructura de los metales base y el de soldadura y sus interfaces, para diferentes aportes de calor, combinando microscopía electrónica de barrido, microanálisis de espectroscopía de dispersión de energía (SEM/EDS) y microscopía óptica (OM). Los resultados indicaron que la interfase entre los metales base y el metal de soldadura tiene una excelente consistencia y no hay evidencia de grietas para los diferentes aportes de calor. Al aumentar la entrada de calor, se ha observado que se incrementa la cantidad de austenita secundaria en el metal de soldadura y en la zona afectada por el calor del acero 2205. Hubo un crecimiento epitaxial en la interfaz de 2209/2205, y hubo una zona de transición fina y límites Tipo II en la interfaz de 2209/API 5L X80. En la zona afectada por el calor del acero X80 se detectaron áreas que contenían granos gruesos, finos y parcialmente finos. Los resultados del ciclo térmico determinaron que el pico de temperatura en las áreas alejadas de la línea de fusión habían aumentado al aumentar la entrada de calor y que la zona afectada por el calor de los dos metales base, particularmente el acero X80, se había extendido aún más.

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Citas

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