Mitigating the susceptibility to intergranular corrosion of alloy 625 by friction-stir welding

In this work, friction-stir welding (FSW) was employed to alloy 625 grade I (soft annealed) sheets. Therefore, solid-state based welding was undertaken with a tool rotational speed of 200 rpm and a welding speed of 1 mm/s. Microstructural features were analyzed by light optical and scanning electron...

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Detalles Bibliográficos
Autores principales: Lemos, Guilherme Vieira Braga, Farina, Alexandre Bellegard, Piaggio, Henrique, Bergmann, Luciano, Ferreira, Jane Zoppas, dos Santos, Jorge Fernandez, Vander Voort, George, Reguly, Afonso
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2022
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8894336/
https://www.ncbi.nlm.nih.gov/pubmed/35241757
http://dx.doi.org/10.1038/s41598-022-07473-0
Descripción
Sumario:In this work, friction-stir welding (FSW) was employed to alloy 625 grade I (soft annealed) sheets. Therefore, solid-state based welding was undertaken with a tool rotational speed of 200 rpm and a welding speed of 1 mm/s. Microstructural features were analyzed by light optical and scanning electron microscopy (LOM and SEM). Moreover, microhardness measurements were performed. The susceptibility to intergranular corrosion was verified by the double-loop electrochemical potentiokinetic reactivation (DL-EPR) test. Complementary, intergranular corrosion was also evaluated by the ASTM G28 Method A. FSW promoted grain refinement, increased microhardness, and reduction in the degree of sensitization. Finally, the mean corrosion rate observed in the ASTM G28 Method A test was 0.4406 mm/year, which suggests a good weld quality.

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