2026-04-27T13:01:22Zhttps://uvadoc.uva.es/oai/request

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

Effect of Widmanstätten η phase on tensile shear strength of resistance spot welding joints of A286 superalloy Martín Llorente, Óscar Tiedra Frontaura, María del Pilar San Juan Blanco, Manuel Producción Científica 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. 2025-01-17T12:41:09Z 2025-01-17T12:41:09Z 2019 info:eu-repo/semantics/article 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 eng https://www.metallurgical-research.org/articles/metal/abs/2019/03/metal180151/metal180151.html info:eu-repo/semantics/restrictedAccess EDP Sciences EDP Sciences SI