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oai:uvadoc.uva.es:10324/740032025-01-17T20:00:23Zcom_10324_1136com_10324_931com_10324_894col_10324_1218

Martín Llorente, Óscar Tiedra Frontaura, María del Pilar San Juan Blanco, Manuel 2025-01-17T12:41:09Z 2025-01-17T12:41:09Z 2019 Metallurgical Research and Technology, 2019, vol. 116, n.º 3, Article Number 302 2271-3646 https://uvadoc.uva.es/handle/10324/74003 10.1051/METAL/2018095 Article Number 302 3 Metallurgical Research & Technology 116 2271-3654 This work aims to study the effect of Widmanstätten η phase on tensile shear strength (TSS) of resistance spot welding joints (RSW) of A286 superalloy subjected to post-weld high temperature aging treatment. The tensile shear test specimens were welded in the solution treated condition, and then subjected to six different post-weld aging treatments (at an aging temperature of 840 °C for six different aging times). The as-cast dendritic microstructure of the weld nugget and the austenite equiaxed-grain microstructure of the base metal have a different response to the post-weld high temperature aging treatment. Growth of Widmanstätten η phase in the weld nugget is faster than in the base metal. While in the base metal the Widmanstätten η phase precipitates into the grain, in the weld nugget precipitates at the interdendritic region because of the segregation of Ti towards the last-to-solidify interdendritic regions (studied by performing SEM/EDX analysis). Although the hardness increases with the presence of Widmanstätten η phase, the increase in hardness does not necessarily imply an increase in the experimental TSS. eng info:eu-repo/semantics/restrictedAccess EDP Sciences Effect of Widmanstätten η phase on tensile shear strength of resistance spot welding joints of A286 superalloy info:eu-repo/semantics/article